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Inverter patents



      

This page is updated frequently with new Inverter-related patent applications.




Date/App# patent app List of recent Inverter-related patents
06/16/16
20160173095 
 Level shifting circuit, apparatus and  operating the same patent thumbnailLevel shifting circuit, apparatus and operating the same
A level shifting circuit includes an input circuit, a leakage divider circuit, a skew inverter circuit and a buffering circuit. The input circuit has an input terminal configured to receive an input voltage.
Taiwan Semiconductor Manufacturing Company, Ltd.


06/16/16
20160173075 
 Clock generator and  adjusting phases of multiphase clocks by the same patent thumbnailClock generator and adjusting phases of multiphase clocks by the same
A clock generator that outputs multiphase clocks comprises a ring oscillator that includes a plurality of inverter circuits connected in a circular pattern and outputs, from the inverter circuits, clocks provided with a delay time based on a delay control signal, a first frequency divider that divides an injection clock by a first value and outputs the clock as a reference clock, a second frequency divider that divides one of the multiphase clocks by a second value and outputs the clock as a comparison clock, and a frequency comparator that compares frequencies of the reference clock and the comparison clock and output the delay control signal based on a result of the comparison. The ring oscillator is configured to adjust the delay time based on the delay control signal..
Megachips Corporation


06/16/16
20160172895 
 Wireless power transfer method, apparatus and system for low and medium power patent thumbnailWireless power transfer method, apparatus and system for low and medium power
A wireless power transfer method for a wireless power transfer apparatus using full and half-bridge inverter topologies includes detecting whether or not a wireless power receiver is present within a range of power being transferrable in a wireless manner, transmitting a detection signal to the wireless power receiver, receiving at least one of identification information and setting information from the wireless power receiver, receiving a control error packet from the wireless power receiver, and controlling an amount of power to be transferred by using the combination of a driving frequency, a duty cycle or a power signal phase to the full or half-bridge inverter.. .
Lg Electronics Inc.


06/09/16
20160165704 
 Discharge lamp lighting apparatus patent thumbnailDischarge lamp lighting apparatus
A discharge lamp lighting apparatus includes an inverter circuit supplying an ac voltage to a discharge lamp and a resonant circuit that increases a supply voltage supplied to the discharge lamp. The inverter circuit is driven using a first frequency including a resonant frequency of the resonant circuit during a first period in which breakdown and a glow discharge are generated, driven using a second frequency including a resonant frequency of the resonant circuit, lower than the first frequency, during a second period in which an arc discharge is generated, and driven using a third frequency lower than the second frequency, during a third period.
Murata Manufacturing Co., Ltd.


06/09/16
20160164440 
 Solar energy utilization system patent thumbnailSolar energy utilization system
A solar energy utilization system includes a solar panel, a motor driven by an inverter circuit functioning as a motor drive circuit with power output by the solar panel, a solar output voltage monitor functioning as a monitor that monitors an input or an output of the solar panel and also functioning as a monitor that monitors an input or an output of the inverter circuit, and a controller. The controller has a control mode in which the inverter circuit is controlled such that an output voltage of the solar panel is maintained at a voltage higher than a maximum power point voltage.
Sharp Kabushiki Kaisha


06/09/16
20160164278 
 Electronic apparatus patent thumbnailElectronic apparatus
An electronic apparatus includes a rotating electric machine that has a plurality of multi-phase winding sets, each of which has a plurality of phase windings; a plurality of inverter circuits that are connected to the plurality of multi-phase winding sets respectively; and a control circuit that controls the plurality of inverter circuits such that a multi-phase alternating current is supplied to each of the plurality of multi-phase winding sets from each of the plurality of inverter circuits. The control circuit determines that a short circuit occurs when i) a plurality of phase current added values obtained by adding each phase current flowing through each of the plurality of phase windings calculated at each of the plurality of multi-phase winding sets; and ii) an absolute value of a total phase current added value obtained by adding all of the plurality of phase current added values is smaller than a predetermined value..
Denso Corporation


06/09/16
20160163400 
 Liquid crystal display and shift register thereof patent thumbnailLiquid crystal display and shift register thereof
The present invention provides a liquid crystal display and a shift register thereof. Each shift register unit of the shift register comprises a storage circuit, receiving and temporarily storing a former stage signal, a voltage level control circuit and an inverter circuit, charging and discharging scan lines of a liquid crystal display panel, and a first node exists between the voltage level control circuit and the inverter circuit, and a second node exists between the storage circuit and the voltage level control circuit, and the storage circuit is employed to selectively invert and output received level signals to the second node under control of a first sequence signal, and the voltage level control circuit is employed to provide a low level signal to the first node, and the inverter circuit is employed to selectively invert and output the low level signal provided by the voltage level control circuit under control of a second sequence signal.
Shenzhen China Str Optolectronics Technology Co., Ltd.


05/19/16
20160141887 
 Tuning circuit, tuning method and resonance-type contactless power supply patent thumbnailTuning circuit, tuning method and resonance-type contactless power supply
The present disclosure relates to a tuning circuit, a tuning method and a resonance-type contactless power supply. The resonance-type contactless power supply has the characteristic that an inductor current has a maximum value when it operates at a resonance frequency.
Silergy Semiconductor Technology (hangzhou) Ltd.


05/12/16
20160134212 
 Motor control apparatus, electric power steering apparatus and vehicle using the same patent thumbnailMotor control apparatus, electric power steering apparatus and vehicle using the same
A motor control apparatus includes a motor current shutoff unit inserted between a multi-phase inverter circuit and a multi-phase electric motor to shut off a current for each of plural phases, the inverter circuit including an arm for each of the plural phases, a redundant arm unit including one or more arms, a connection selecting unit selecting which one of windings of the electric motor is to be connected to each of the one or more arms of the redundant arm unit, an abnormal arm detection unit detecting an abnormality in each of the plural phases of the inverter circuit, and an abnormality control unit shutting off connection between an abnormal arm and the motor when the abnormal arm detection unit detects the abnormal arm, and connecting the one or more arms of the redundant arm unit to a winding of the motor shut off.. .
Nsk Ltd.


05/12/16
20160134170 
 Driving device of steering for a vehicle patent thumbnailDriving device of steering for a vehicle
A driving device for steering a vehicle includes a housing cover formed with a power supply connector; an insert mold installed in the housing cover and formed with a connecting connector; a printed circuit board disposed on one side of the insert mold; a motor driving module disposed on one side of the printed circuit board, formed with a first power connecting portion which is connected to the connecting connector by being installed in the housing cover, having a relay circuit portion which is connected to the first power connecting portion to switch power and three inverter circuit portions which are connected to the relay circuit portion, and formed with a second power connecting portion which is connected to the respective inverter circuit portions; and a motor portion disposed on one side of the motor driving module, and having a motor connector connected to the second power connecting portion.. .
Hyundai Mobis Co., Ltd.


05/12/16
20160134131 

Power-supplying device and wireless power-supplying system


A power-supplying device for wirelessly transmitting alternating current (ac) power to a power-receiving device includes a voltage converter, an inverter circuit connected to the voltage converter, a communication unit configured to receive an output value of a rectification circuit provided in the power-receiving device from the power-receiving device, and a switching control unit configured to control the inverter circuit so that the inverter circuit converts direct current (dc) power into ac power and control whether the voltage converter steps up an input voltage or not based on whether an output value of the voltage converter or the output value of the rectification circuit reaches a specific value.. .
Ihi Corporation


05/12/16
20160131142 

Ventilation device


Between the lower stage in respective phases of inverter circuit and the negative potential side, shunt resistors are inserted for respective phases. The potential differences across shunt resistors occurring by current flowing through shunt resistors are amplified by amplifier unit.
Panasonic Intellectual Property Management Co., Ltd.


05/05/16
20160126944 

P-channel mosfet high voltage driver


In accordance with one or more aspects of the disclosed embodiments, a drive circuit having a source of modulation for producing a modulated signal, a level shifter configured to receive the modulated signal and produce a level-shifted driver signal, an inverter circuit configured to receive the level-shifted driver signal and produce a mosfet control signal, and at least one p-channel metal oxide semiconductor field effect transistor (mosfet) configured to receive the mosfet control signal and modulate an application of high current to a load, where the mosfet control signal is supplied directly to the p-channel mosfet through the inverter circuit.. .
The Boeing Company


05/05/16
20160126939 

Synchroniser flip-flop


A synchroniser flip-flop is provided, which is able to better respond to input values that are not provided for the necessary setup or hold times. The flip-flop includes a latch that includes inverter circuitry for producing a first signal and a signal in dependence on a value of an input signal at a node.
Arm Limited


05/05/16
20160126863 

Inverter device


An inverter device includes: a step-up circuit; an inverter circuit; a control unit for controlling the step-up circuit and the inverter circuit; and a reactor provided on an electric path for outputting the converted ac power to an ac system. An output current target value is calculated based on an input power value of dc power and a voltage value of the ac system, and a current target value and a voltage target value for the inverter circuit are calculated based on the output current target value, to control the inverter circuit.
Sumitomo Electric Industries, Ltd.


05/05/16
20160126862 

Method and system for operating a multilevel inverter


A controller for operating a multilevel electric power inverter circuit. The controller is configured to generate and apply to the plurality of switching elements switch signal waveforms, the switch signal waveforms comprising a first control signal for causing an energy storage device to be series connected with a direct current source and a load or an alternating current source and charged to a predetermined value proportional to a voltage of the direct current source, and a second control signal for causing the energy storage device to be disconnected from the direct current source and series connected with the load or the alternating current source, thereby causing the energy storage device to be discharged..
Ecole De Technologie Superieure


05/05/16
20160126847 

Current sensorless mppt for pv micro-inverters


Systems, methods, and devices for use with photovoltaic micro-inverters. A control system for controlling power switches in a full bridge inverter in a dc/dc converter uses an estimate of the output current of a photovoltaic (pv) panel.

05/05/16
20160126831 

Charge pump circuit, integrated circuit, electronic device and method therefor


A charge pump circuit for generating a negative voltage has: a clock generator arranged to output at least one clock signal; a switched capacitor voltage inverter circuit including capacitive elements wherein the switched capacitor voltage inverter circuit receives the at least one clock signal and generates a negative voltage therefrom. The charge pump circuit further has a regulation control loop providing a feedback path from an output of the switched capacitor voltage inverter circuit to a supply input of the switched capacitor voltage inverter circuit, and an output arranged to output a generated negative voltage.
Mediatek Singapore Pte. Ltd.


05/05/16
20160126830 

Charge pump circuit, integrated circuit, electronic device and method therefor


A charge pump circuit for generating a negative voltage has a switched capacitor voltage inverter circuit arranged to receive at least one clock signal and generate a negative voltage therefrom; a regulation control loop providing a feedback path from the output of the switched capacitor voltage inverter circuit to a supply input of the switched capacitor voltage inverter circuit, wherein the regulation control loop has a filter arranged to filter the generated negative voltage; and an output arranged to output the filtered generated negative voltage.. .
Mediatek Singapore Pte. Ltd.


05/05/16
20160126754 

Power transmission system


A power transmission system is disclosed in which power is transmitted from a power transmission apparatus to a power receiving apparatus by electric field coupling between active and passive electrodes. The power transmission apparatus includes a step-up/down circuit for stepping up or down a direct voltage and an inverter circuit for converting the direct voltage into an alternating voltage that is output to the active and passive electrodes.
Murata Manufacturing Co., Ltd.


05/05/16
20160126742 

Inverter device


An inverter device includes a circuit configuration for converting, to ac power, dc powers respectively given from a first power supply and a second power supply which outputs power with voltage lower than that of the first power supply. The inverter device includes: a first step-up circuit; a second step-up circuit; an inverter circuit connected to both step-up circuits connected in parallel to each other, the inverter circuit configured to convert powers given from both step-up circuits to ac power; and a control unit configured to multiply a power value including the ac power outputted from the inverter circuit, by a ratio of a power value of the dc power of each step-up circuit to a total power value obtained by summing the dc powers of both step-up circuits, and set a current target value for each step-up circuit based on a value obtained by the multiplication..
Sumitomo Electric Industries, Ltd.


04/28/16
20160118977 

Dc-dc converter with temperature, process and voltage compensated dead time delay


Temperature, process and supply compensated delay circuits, dc to dc converters and integrated circuits are presented in which switch driver dead time delays are provided using a plurality of cascaded cmos inverter circuits with a first inverter coupled through a diode-connected mos transistor to a regulated voltage or circuit ground and a mos capacitor is provided between the first inverter output and the regulated voltage or circuit ground to provide a controlled delay time. A second cascaded cmos inverter is powered by a compensated voltage which decreases with temperature to operate as a comparator, and certain embodiments include one or more intermediate cmos inverters to form a level shifting circuit between the second inverter and the final output inverter, with the level shift inverters powered by successively higher compensated voltages that decrease with increasing temperature..
Texas Instruments Incorporated


04/28/16
20160118809 

Wireless power transmitting apparatus and wireless power transmission system


A wireless power transmitting apparatus includes: a loop conductor for power transmission having an inductance; an inverter circuit configured to receive a dc voltage, convert the dc voltage into an ac voltage, and apply the ac voltage to the loop conductor; a capacitor connected between one end of the loop conductor and at least one end of the inverter circuit; and a metal layer covering one of the faces formed by the loop conductor farthest from a power receiving apparatus.. .
Murata Manufacturing Co., Ltd.


04/28/16
20160117907 

Device for detecting blockage of air filter mesh


A device for detecting blockage of an air filter mesh, including: an air inlet, an air outlet, an air duct, a fan or a wind wheel, a blower motor, an air filter mesh, and a controller. The controller includes a main control board including: a microprocessor, an inverter circuit, and a motor operation parameter detecting circuit.
Zhongshan Broad-ocean Motor Co., Ltd.


04/21/16
20160111984 

Power tool


It is an object of the invention to provide a power tool capable of preventing damage of a switching element while maintaining drive power of a motor even when being connected to a power supply of different voltage. An impact driver 1 includes a motor 3; a rectifying circuit 23; an inverter circuit 20; and an arithmetic part 24.

04/21/16
20160111968 

Inverter power supply system


An inverter power supply system includes an inverter circuit and a feedback circuit, where the inverter circuit is configured to convert a first alternating current voltage into a second alternating current voltage, and convert a first alternating current into a second alternating current; the feedback circuit determines whether a value of the second alternating current voltage exceeds a preset threshold; and when the value of the second alternating current voltage exceeds the preset threshold, the feedback circuit acquires a feedback current, compensates for a reference value of the first alternating current according to the feedback current, generates a control signal according to a reference value, after compensation, of the first alternating current, and outputs the control signal to the inverter circuit to adjust the value of the second alternating current voltage.. .

04/07/16
20160099715 

Level shift circuit and semiconductor device


A level shift circuit includes: a latch circuit (q5, q6, q7, q8) including first (q5, q7) and second (q6, q8) inverter circuits; a first input mos transistor (q1) operating in accordance with an input signal; a second input mos transistor (q2) operating in accordance with an inversion signal of the input signal; and a current-voltage control mos transistor (q9). The latch circuit (q5, q6, q7, q8) outputs a voltage having been converted from the input voltage in level.
Renesas Electronics Corporation


04/07/16
20160099650 

Gate-power-supply device and semiconductor circuit breaker using same


A gate-power-supply device is provided with an inverter circuit, a transformer, and rectifier circuits. The device includes secondary-side parallel capacitors, connected in parallel to secondary-side coils of the transformer, for cancelling inductance components of the secondary-side coils at the drive frequency of the inverter circuit.
Mitsubishi Electric Corporation


03/31/16
20160095264 

Power module and power conversion apparatus using same


A power module includes a plurality of semiconductor devices constituting upper/lower arms of an inverter circuit, a plurality of conductive plates arranged to face electrode surfaces of the semiconductor devices and a module case configured to accommodate the semiconductor devices and conductive plates, wherein the module case includes a heat-radiation member made of plate-like metal and facing a surface of the conductive plate and a metallic frame body having an opening that is closed by the heat-radiation member, and wherein a heat-radiation fin unit having a plurality of heat-radiation fins vertically arranged thereon is provided at a center of the heat-radiation member, and a joint portion with the frame body is provided at an peripheral edge of the heat-radiation member, and the heat radiation member has a heat conductivity higher than that of the frame body, and the frame body has a higher rigidity than that of the heat-radiation member.. .
Hitachi Automotive Systems, Ltd.


03/31/16
20160094180 

Electric motor drive control device, electrically driven power steering device, electrically driven brake device, and electrically driven pump device


An electric motor drive control device includes: an inverter circuit that converts dc power inputted via a dc bus to multiphase ac power and outputs the multiphase ac power to an electric motor; a current detector that detects a dc current flowing in the dc bus; a pwm generator that generates pwm signals and outputs the pwm signals to the inverter circuit; a current calculator that calculates a current value for each of phases to be flowed to the electric motor based upon a value of the dc current and the pwm signals; and a current controller that generates a command signal based upon the current value, and outputs the command signal to the pwm generator, wherein: if one of the phases of the ac power has become missing, the current calculator determines which phase is one that has become missing and calculates current values for other phases.. .
Hitachi Automotive Systems, Ltd.


03/17/16
20160079979 

Pulsed level shift and inverter circuits for gan devices


Gan-based half bridge power conversion circuits employ control, support and logic functions that are monolithically integrated on the same devices as the power transistors. In some embodiments a low side gan device communicates through one or more level shift circuits with a high side gan device.
Navitas Semiconductor Inc.


03/17/16
20160079978 

Level shift and inverter circuits for gan devices


Gan-based half bridge power conversion circuits employ control, support and logic functions that are monolithically integrated on the same devices as the power transistors. In some embodiments a low side gan device communicates through one or more level shift circuits with a high side gan device.
Navitas Semiconductor Inc.


03/17/16
20160079892 

Inverter circuit for an electric machine


An inverter circuit electrically connects between a high-voltage bus and a multi-phase electric machine, including a plurality of switch pairs. Each switch pair includes a first switch electrically connected in series with a second switch at a node.
Gm Global Technology Operations Llc


03/17/16
20160079812 

Power transmission device, wireless power transmission system, and power transmission determination method


The frequency of an ac voltage applied to an active electrode and a passive electrode of a power transmission device is swept and input impedance (input voltage dcv) of a power receiving device side as viewed from a dc-to-ac inverter circuit is detected for each change of the frequency of the ac voltage. A determination is made as to whether the input voltage dcv in a first frequency range determined by a resonant frequency of a series resonance circuit of the power transmission device and parallel resonance circuit of the power receiving device falls with a range of 25 mv to 450 mv, and the input voltage dcv detected in a second frequency range is equal to or lower than 100 mv.
Murata Manufacturing Co., Ltd.


03/10/16
20160073458 

Lighting apparatus, illumination light source, and power supply unit


A lighting apparatus in which a light emitter (an illumination light source) can be easily reduced in size is provided. The lighting apparatus includes: a light emitter; and an inverter circuit that converts power supplied from a commercial power supply, into ac power, and outputs the ac power to the light emitter, and the light emitter includes: a capacitor; a rectifier circuit that rectifies the ac power obtained through the capacitor; and an led that emits light using power rectified by the rectifier circuit..
Panasonic Intellectual Property Management Co., Ltd.


03/10/16
20160072424 

Control device of alternating-current electric motor


A control device includes a gate-signal generating unit that outputs a gate signal to an inverter circuit and a voltage-vector generating unit that generates a voltage command to the gate-signal generating unit on the basis of a torque command ptr from an upper unit, rotating speed fm of an alternating-current electric motor, and a direct-current voltage value efc applied to the inverter circuit. The voltage-vector generating unit calculates, on basis of a modulation rate, which is a ratio of the direct-current voltage value efc and a voltage amplitude command in the voltage command, a pwm current distortion rate serving as an index representing a degree of a current harmonic caused by pwm control, generates the voltage amplitude command value on the basis of the calculated pwm current distortion rate, and outputs the voltage amplitude command value to the gate-signal generating unit..
Mitsubishi Electric Corporation


03/03/16
20160064353 

Semiconductor device and manufacturing the same


There is provided a semiconductor device having a converter circuit, a brake circuit and an inverter circuit and manufacturable by a simplified manufacturing process. The semiconductor device has a plurality of die pads, igbts, diodes, freewheel diodes, an hvic and lvics mounted on the plurality of die pads, a plurality of leads, and an encapsulation resin body that covers these component parts.
Mitsubishi Electric Corporation


02/25/16
20160057843 

Electrodeless fluorescent ballast driving circuit and resonance circuit with added filtration and protection


A ballast circuit for a lighting system using an induction fluorescent lamp utilizes an ac-dc rectification circuit, a dc-dc boost power conversion circuit, a dc-ac half bridge inverter circuit, and a resonating circuit to ignite the lamp and maintain substantially constant power output of the lamp, while the dc-ac half bridge inverter circuit is further comprised of a gate isolation transformer connected in a half bridge inverter schematic which uses a ballast integrated circuit (ic) to drive a high side mosfet and a low side mosfet and the gate isolation transformer electrically isolates a gate signal to the high side mosfet.. .
Environmental Potentials


02/25/16
20160056811 

Testable power-on-reset circuit


An integrated circuit with a testable power-on-reset (por) circuit includes a voltage divider, an inverter, a level-shifter, a buffer and a flip-flop. The voltage divider receives a first supply voltage and generates a second supply voltage.
Freescale Semiconductor, Inc.


02/25/16
20160054368 

Level shift circuit with short-circuit detection mechanism and short-circuit detection method thereof


A level shift circuit includes a level shift module and a voltage comparing module. The level shift module includes a plurality of stages of level shift units, each including a front-end circuit and an inverter circuit.
Au Optronics Corp.


02/18/16
20160049829 

Double-port energy storage system and control method thereof


A double-port energy storage system includes a bi-directional power conversion circuit, a dc-ac inverter circuit, an electric energy storage facility, a first switch, a second switch, a third switch, a fourth switch, a first ac port and a second ac port. The double-port energy storage system controllably provides various classifications of power supply quality by controllably switching on or off some of the first switch, the second switch, the third switch the fourth switch via the first ac port and the second ac port..
Ablerex Electronics Co., Ltd.


02/04/16
20160036424 

Power efficient multiplexer


A power efficient multiplexer. In accordance with a first embodiment, a power efficient multiplexer comprises a transmission gate structure for selectively passing one of a plurality of input signals and a stacked inverter circuit for inverting the one of a plurality of input signals.
Intellectual Ventures Holding 81 Llc


02/04/16
20160036360 

Motor control device, air conditioner, washing machine and refrigerator


A motor control device driving a motor via an inverter circuit includes a current sensing element, a pwm signal generation unit and a current detection unit. The pwm signal generation unit is configured to generate three-phase pwm signals in a manner such that the current detection unit is capable of detecting two-phase currents at two fixed time-points within a carrier period of the pwm signal.
Kabushiki Kaisha Toshiba


02/04/16
20160036359 

Inverter apparatus


An inverter apparatus includes an inverter circuit, a capacitor, and a control unit. In the first control mode, the control unit shifts a phase of at least one of pwm signals of three phases such that a time period during which polarities of output voltages of three phases are the same is shorter in the first control mode than the time period in the second control mode; and controls the inverter circuit so as to supply a direct current to the three-phase ac motor as a d-axis current by outputting the pwm signals of three phases, each having a phase after the phase shift processing.
Kabushiki Kaisha Toyota Jidoshokki


02/04/16
20160036348 

Electric-power conversion system


The number of constituent components is reduced so as to provide a small-size and inexpensive electric-power conversion system. The electric-power conversion system is provided with an inverter circuit (14) connected with the rear stage of an ac power source, a smoothing capacitor (22) connected with the rear stage of the inverter circuit (14) by way of a rectifying device (20), a charging switch (2) that is connected with the front stage of the inverter circuit (14), that inputs an electric quantity based on an output of the ac power source (1) to the inverter circuit (14) when being turned on, and that cuts off an input of the electric quantity to the inverter circuit (14) when being turned off, and an inrush current prevention circuit (7) having an inrush current prevention switch (3) and an inrush current prevention resistor (4) that is connected in series with the rear stage of the inrush current prevention switch (3); the electric-power conversion system is characterized in that the inrush current prevention circuit (7) is connected in parallel with the charging switch (2)..
Mitsubishi Electric Corporation


02/04/16
20160036347 

Electric-power conversion system


The number of constituent components is reduced so as to provide a small-size and inexpensive electric-power conversion system. The electric-power conversion system is provided with an inverter circuit (14) connected with the rear stage of an ac power source, a smoothing capacitor (22) connected with the rear stage of the inverter circuit (14) by way of a rectifying device (20), a charging switch (2) that is connected with the front stage of the inverter circuit (14), that inputs an electric quantity based on an output of the ac power source (1) to the inverter circuit (14) when being turned on, and that cuts off an input of the electric quantity to the inverter circuit (14) when being turned off, and an inrush current prevention circuit (7) having an inrush current prevention switch (3) and an inrush current prevention resistor (4) that is connected in series with the rear stage of the inrush current prevention switch (3); the electric-power conversion system is characterized in that the inrush current prevention circuit (7) is connected in parallel with the charging switch (2)..
Mitsubishi Electric Corporation


02/04/16
20160036346 

Electric-power conversion system


The number of constituent components is reduced so as to provide a small-size and inexpensive electric-power conversion system. The electric-power conversion system is provided with an inverter circuit (14) connected with the rear stage of an ac power source, a smoothing capacitor (22) connected with the rear stage of the inverter circuit (14) by way of a rectifying device (20), a charging switch (2) that is connected with the front stage of the inverter circuit (14), that inputs an electric quantity based on an output of the ac power source (1) to the inverter circuit (14) when being turned on, and that cuts off an input of the electric quantity to the inverter circuit (14) when being turned off, and an inrush current prevention circuit (7) having an inrush current prevention switch (3) and an inrush current prevention resistor (4) that is connected in series with the rear stage of the inrush current prevention switch (3); the electric-power conversion system is characterized in that the inrush current prevention circuit (7) is connected in parallel with the charging switch (2)..
Mitsubishi Electric Corporation


02/04/16
20160036300 

Electronically commutated motor


An electronically commutated motor, including: a motor body and a motor controller. The motor controller includes a control box and a circuit board disposed in the control box.
Zhongshan Broad-ocean Motor Co., Ltd.


02/04/16
20160033559 

Overcurrent detecting device and overcurrent detecting method


The present invention relates to an overcurrent detecting device and an overcurrent detecting method each of which detects an overcurrent upstream of an inverter circuit in a drive control device for an electric motor. The overcurrent is detected without providing a shunt resistor in the upstream of the inverter circuit, and miniaturization of a circuit substrate is achieved.
Hitachi Automotive Systems, Ltd.


01/28/16
20160028379 

Clock generator


A clock generator comprises a voltage controlled oscillator including a ring oscillator which has a plurality of differential inverter circuits connected in a ring shape, and a phase controller to control an output of a differential inverter circuit which belongs to a second group, in a first state or a second state, for a predetermined time period. The differential inverter circuit which belongs to the second group is distinct from a differential inverter circuit which belongs to a first group.
Megachips Corporation


01/21/16
20160020707 

Electric power conversion device


Provided is an installation structure for an electric power conversion device whereby the size of the device is reduced, and noise conducted to an external battery due to a switching operation is reduced. The electric power conversion device according to the present invention is therefore provided with an inverter circuit unit, a converter circuit unit for stepping up a voltage from an external battery and outputting to the inverter circuit unit or stepping down a power source voltage of the inverter circuit unit and outputting to a battery, and a capacitor package for storing a smoothing capacitor connected to an inverter circuit unit power source voltage and a converter circuit unit battery-side power source voltage.
Hitachi Automotive Systems, Ltd.


01/21/16
20160020657 

Inverter-integrated electric compressor


The inverter-integrated electric compressor integrally incorporates an inverter device, and comprises a uvw busbar that conducts three-phase alternating current power converted by an inverter circuit on a circuit board to a glass terminal that penetrates an inverter housing section. The uvw busbar being configured of three long thin plate-shaped conductive material busbars, one end of each being provided with a connector terminal that is connected to the glass terminal, are the three conductive material busbars being housed in and integrated with a resin case.
Mitsubishi Heavy Industries Automotive Thermal Systems Co., Ltd.


01/14/16
20160013701 

Electric compressor


An electric compressor including a compression mechanism, an electric motor driving the compression mechanism, a housing accommodating the compression mechanism and the electric motor, an inverter box located on an outer surface of the housing, an inverter substrate accommodated in the inverter box and having an inverter circuit supplying electric power to the electric motor, the inverter substrate having a first surface and a second surface that is a reverse surface of the first surface, a plurality of fastening members fixing the inverter substrate to the inverter box, and a reinforcing member having a first end fixed to the inverter box and a second end soldered to the first surface or the second surface of the inverter substrate. The reinforcing member extends toward the first surface or the second surface of the inverter substrate in the inverter box.
Kabushiki Kaisha Toyota Jidoshokki


01/07/16
20160007492 

Power semiconductor device and power conversion device


A power semiconductor device includes a plurality of power semiconductor elements constituting upper and lower arms of an inverter circuit, a first sealing member sealing the plurality of power semiconductor elements, a positive electrode-side terminal and a negative electrode-side terminal each connected with any of the plurality of power semiconductor elements and protruding from the first sealing member, a second sealing member sealing at least a part of the positive electrode-side terminal and at least a part of the negative electrode-side terminal, and a case in which the power semiconductor elements sealed with the first sealing member are housed.. .
Hitachi Automotive Systems, Ltd.


12/31/15
20150381095 

Inverter control apparatus and control method thereof


An inverter control apparatus and a control method thereof are provided. The inverter control apparatus and a control method thereof stably operate a three-phase motor using a capacitor having a small capacitance for a dc link.
Snu R&db Foundation


12/31/15
20150381063 

Dc-dc converter


A dc-dc converter wherein a series reactor and primary-side terminals of a transformer are connected between output terminals of a full-bridge inverter in which each of an upper arm and a lower arm includes a switching element and a freewheel diode, and a rectifier circuit and a filter circuit are connected to secondary-side terminals of the transformer. The dc-dc converter includes a circulation current generation mode in which a circulation current flowing between the transformer and the switching element is generated in a power non-transmission period, and a circulation current interruption mode in which the circulation current is interrupted..
Mitsubishi Electric Corporation


12/24/15
20150372615 

Circuits and methods for photovoltaic inverters


Circuits and methods for photovoltaic inverters are provided. In some embodiments, a power inverter circuit is provided, the inverter comprising: an input terminal for a direct current source coupled to a first conductor; a first side of a capacitor coupled to the input terminal; a second input terminal for the direct current source coupled to first sides of a first switch and second switch; a second side of the capacitor coupled to first sides of a third switch and fourth switch; a first side of a first inductor coupled to the first input terminal, the first side of the capacitor and the first conductor; a second side of the first inductor coupled to second sides of the first switch and third switch; and a first side of a second inductor coupled to a second conductor, and second sides of the second switch and fourth switch..
Arizona Board Of Regents, For And On Behalf Of, Arizona State University


12/24/15
20150372559 

Inverter circuit board and inverter-containing electric compressor using same


Provided is an inverter circuit board to which a p-n terminal is attached firmly and attached such that stress applied to the circuit board can be distributed, making it possible to prevent detachment of the p-n terminal or damage to the circuit board or any components mounted thereon. Also provided is an inverter-containing electric compressor.
Mitsubishi Heavy Industries Automotive Thermal Systems Co., Ltd.


12/24/15
20150372502 

Power-supplying device and wireless power supply system


A power-supplying device and a wireless power supply system of the present disclosure include an inverter circuit configured to convert direct current power into alternating current (ac) power, a resonance circuit configured to wirelessly transmit power toward a power-receiving device based on the ac power, and a control unit configured to control the inverter circuit at a switching frequency based on state information of predetermined elements.. .
Ihi Corporation


12/24/15
20150371750 

Magnetic assembly


This invention provides a magnetic assembly which can be used in communication circuit, inverter circuit of electronic equipment. The magnetic assembly is mainly composed of a first substrate, a second substrate and a magnetic element.
Mag. Layers Scientific-technics Co., Ltd.


12/17/15
20150364947 

Power-supplying device, and wireless power-supplying system


A power-supplying device including an inverter circuit, a resonance circuit connected to the inverter circuit and configured to transfer alternating current power to a power-receiving device in a wireless manner, and a switching control unit that adjusts a parameter of respective switching signals that control on and off of respective switching elements constituting the inverter circuit so that an inter-terminal voltage of a specific element constituting the inverter circuit or the resonance circuit does not exceed a predetermined limit value.. .
Ihi Corporation


12/10/15
20150357939 

Cascaded h-bridge inverter capable of operating in bypass mode


A cascaded h-bridge inverter capable of operating in bypass mode is disclosed where a bypass function can be performed through control of power switch, instead of allowing each unit power cell forming a cascaded h-bridge inverter to use a separate bypass switch, and a cell driver controls each power switch in a freewheeling mode to allow a current inputted to any output terminal to flow other output terminals when bypass function is to be performed for relevant unit power cell, whereby a stable operation can be performed even if there is no bypass switch at each unit power cell, and a cost saving can be accomplished, because an additional bypass switch such as a mc (magnetic controller) is not used.. .
Lsis Co., Ltd.


12/10/15
20150357938 

Power converter


A power converter fixes, in one cycle of an alternating-current voltage output command, a gate pulse signal to always output a direct-current input positive side terminal voltage value of an inverter circuit in a period x1 centering on a phase angle θ1 for higher potential, fixes a gate pulse signal to always output a direct-current input negative side terminal voltage value of the inverter circuit in a period x2 centering on a phase angle θ2 for lower potential, and outputs a gate pulse signal in which a ratio of a period y1, which is obtained by excluding the periods x1 and x2 from a period between the phase angle θ1 and the phase angle θ2, and the first period x1, and a ratio of a period y2, which is obtained by excluding the periods x1 and x2 from a period between the phase angle θ2 and a phase angle θ1+360 [deg].. .
Mitsubishi Electric Corporation


12/10/15
20150357903 

Inverter system, inverter apparatus, and controlling inverter system


An inverter system includes an inverter apparatus and a smoothing capacitor charging-power apparatus. The inverter apparatus includes a transformer and an inverter cell.
Kabushiki Kaisha Yaskawa Denki


12/10/15
20150357863 

Non-contact charging device and non-contact charging method


A non-contact charger aims to control transmitted power efficiently. The non-contact charger includes a transmitting coil, an inverter circuit, a receiving coil, and a transmitted power control circuit.
Panasonic Intellectual Property Management Co., Ltd.


12/10/15
20150357822 

Inverter electric generator system and inverter electric generator thereof


An inverter electric generator system is comprised of: master and at least one slave inverter generators, each inverter generator including a communication section, a controller section generating a pwm carrier and an inverter circuit switched by the pwm carrier to generate an alternative current with a controlled voltage and a controlled frequency, the communication sections being mutually connected to exchange a communication data, and the inverter circuits being connected in parallel so as to collect and output the alternative currents as an electric power output, wherein each of the controller sections is configured to synchronize any point of the pwm carrier with any bit of the communication data received by the communication section. The pwm carriers of the master and the slave inverter generators thereby mutually get synchronized..
Toshiba Kikai Kabushiki Kaisha


12/03/15
20150349662 

Pulse-width modulation control of paralleled inverters


A system includes a paralleled inverter circuit and a controller. The paralleled inverter circuit includes a first inverter and a second inverter.
Hamilton Sundstrand Corporation


12/03/15
20150349656 

Electric power conversion apparatus


An electric power conversion apparatus includes a channel case in which a cooling water channel is formed; a double side cooling semiconductor module that has an upper and lower arms series circuit of an inverter circuit; a capacitor module; a direct current connector; and an alternate current connector. The semiconductor module includes first and second heat dissipation metals whose outer surfaces are heat dissipation surfaces, the upper and lower arms series circuit is disposed tightly between the first heat dissipation metal and the second heat dissipation metal, and the semiconductor module further includes a direct current positive terminal, a direct current negative terminal, and an alternate current terminal which protrude to outside.
Hitachi, Ltd.


12/03/15
20150349521 

Short- circuit detection device and method used in inverter circuit


A method for detecting a short circuit fault in a multi-level inverter circuit is provided. The multi-level inverter circuit includes a plurality of single phase branches each including of switches.
Delta Electronics (shanghai) Co., Ltd.


11/19/15
20150333600 

Electric drive apparatus


Provided is an electric drive apparatus in which a detected portion (10) of a rotation angle sensor is disposed at an end of a shaft (7) of a motor, and a sensor portion (300) as a detection portion of the rotation angle sensor is disposed coaxially with the rotating axis of the shaft. In a control unit (200), an inverter circuit portion with a drive element (sw) for driving the motor, and a control substrate (17) which is separate from the sensor portion and controls the output of the inverter circuit portion are disposed.
Mitsubishi Electric Corporation


11/19/15
20150333522 

Five-level topology units and inverter thereof


Disclosed are five-level topology units and inverter thereof without an extra boosting circuit wherein the cost is reduced by using only one ac filtering inductor and high efficiency is achieved for the absence of the extra boosting circuit and, furthermore, wherein the leakage current is eliminated substantially by using the half-bridge inverter module. The five-level inverter including the five-level topology unit without an extra circuit to raise input voltage (i.e.

11/12/15
20150326209 

Semiconductor device and control method thereof


The present invention provides a semiconductor device including a first terminal and a second terminal respectively coupled to both ends of a crystal resonator, an inverter circuit having an input coupled to the first terminal and an output coupled to the second terminal, a feedback resistor which couples between the first terminal and the second terminal, a variable capacitor coupled to at least one of the first and second terminals, and a control circuit. The control circuit performs control to increase both of the drive capability of the inverter circuit and the capacitance value of the variable capacitor in a second mode rather than a first mode..
Renesas Electronics Corporation


11/12/15
20150326177 

Integrated wire management for roof-integrated solar panels


Roof-integrated solar panels use junction boxes with short cables and connectors at opposite corners. Panel to panel connection is achieved by integrated hooks keeping the cable and connector at either end of the solar panel from touching the roof's decking or battens during installation.
Integrated Solar Technology, Llc


11/12/15
20150326151 

Motor control device


Provided is a motor control device that includes an inverter circuit that includes a plurality of p-side switching elements and a plurality of n-side switching elements and drives a motor via a plurality of motor terminals; a first dynamic brake that brakes the motor by turning on all the phases of the plurality of p-side switching elements or turning on all the phases of the plurality of n-side switching elements; a second dynamic brake that brakes the motor by connecting dynamic brake resistors between the motor terminals; and a control unit that switches, according to the motor speed, between the first dynamic brake and the second dynamic brake, which are the dynamic brakes that brake the motor.. .
Mitsubishi Electric Corporation


11/12/15
20150323823 

Display device


A display device of which frame can be narrowed and of which display characteristics are excellent is provided. In a display device including a switch portion or a buffer portion, a logic circuit portion, and a pixel portion, the pixel portion includes a first inverted staggered tft and a pixel electrode which is connected to a wiring of the first inverted staggered tft, the switch portion or the buffer portion includes a second inverted staggered tft in which a first insulating layer, a semiconductor layer, and a second insulating layer are interposed between a first gate electrode and a second gate electrode, the logic circuit portion includes an inverter circuit including a third inverted staggered thin film transistor and a fourth inverted staggered thin film transistor, and the first to the fourth inverted staggered thin film transistors have the same polarity.
Semiconductor Energy Laboratory Co., Ltd.


11/12/15
20150321574 

Electric motor vehicle


The electric motor vehicle includes a voltage conversion circuit, a primary-side smoothing capacitor, a battery, a system main relay, an inverter circuit, a secondary-side smoothing capacitor, an electric motor, a first voltage sensor, a collision sensor, and a controller. The controller is configured to adjust an operation of the voltage conversion circuit, detect primary-side voltage by using the first voltage sensor in a state that the voltage conversion circuit is operated in a case where a collision is detected by the collision sensor, and detect a state that the system main relay is off based on a change in the detected primary-side voltage..
Toyota Jidosha Kabushiki Kaisha


11/05/15
20150318797 

Half bridge circuit, full bridge circuit constructed with half bridge circuit, and three-phase inverter circuit constructed with half bridge circuit


In a half bridge circuit according to one aspect of the present disclosure, when a voltage between a first terminal and a third terminal or a voltage between the first terminal and the second terminal is greater than or equal to a threshold voltage, a current is passed from the second terminal to the third terminal or from the third terminal to the second terminal according to a polarity of the voltage between the second terminal and the third terminal. When the current is passed from the third terminal to the second terminal, the voltage between the second terminal and the third terminal changes with respect to the voltage applied between the first terminal and the third terminal within a range where the voltage between the first terminal and the third terminal is less than or equal to the threshold voltage..
Panasonic Intellectual Property Management Co., Ltd.


11/05/15
20150314694 

Electrical charging a battery


An electrical apparatus is provided including an electrical drive system and an electrical machine. The electrical machine includes a rotor, a first separate multi-phase stator winding and a second separate multi-phase stator winding.
Volvo Lastvagnar Ab


10/29/15
20150311822 

Inverter device


A three-level inverter circuit includes first to fourth front-stage switches connected in series, and a floating capacitor connected between a connection point of the first and second front-stage switches and a connection point of the third and fourth front-stage switch elements, and outputs an intermediate voltage of a dc power supply through a connection point of the second and third front-stage switches. A bridge circuit includes first, second, third, and fourth rear-stage switches which are bridge-connected to first to fourth terminals.
Murata Manufacturing Co., Ltd.


10/29/15
20150311820 

Power converter


A power inverter device includes an inverter that converts a direct-current (dc) power to an alternating-current (ac) power having an output ac voltage, and a capacitor circuit electrically connected to the inverter. The capacitor circuit is operable to start supplying a capacitor voltage to the inverter at a time point when a predetermined waiting time lapses from a zero cross point of the output ac voltage at a starting up of the inverter circuit, wherein the capacitor voltage has a phase shifted by π/4 radian from the output ac voltage.
Panasonic Intellectual Property Management Co., Ltd.


10/29/15
20150311724 

Ac inductive power transfer system


An inductive power transfer system for device such as a battery charger on an electric vehicle includes a primary circuit having a rectifier and an h bridge inverter connected in parallel to deliver rectified ac voltage to a stationary primary coil of a transformer. The system further includes a secondary circuit on the vehicle including a secondary coil and another rectifier connected in series.
Evatran Group, Inc.


10/29/15
20150311723 

Parallel series dc inductive power transfer system


An inductive power transfer system for a device such as battery charger on an electric vehicle includes a primary circuit having a rectifier and an h bridge inverter connected in parallel with a reactor connected in series to deliver direct current voltage to a stationary primary coil of a transformer. The system further includes a secondary circuit on the vehicle including a secondary coil and another rectifier connected in series.
Evatran Group, Inc.


10/29/15
20150306972 

Electrical powering an electrical machine


An electrical apparatus for powering an electrical machine with two different energy sources includes an electrical drive system having a battery and a super capacitor, and an electrical machine, wherein the electrical machine includes a rotor, a first separate multi-phase stator winding and a second separate multi-phase stator winding, wherein the drive system includes a first multi-phase bridge inverter connected to the first multi-phase stator winding, and wherein the apparatus further includes a second multi-phase bridge inverter connected to the second multi-phase stator winding and to the battery, where the first multi-phase bridge inverter is connected to a super capacitor, and where the drive system includes a switch adapted to connect and disconnect the dc links of the first multi-phase bridge inverter to and from the second multi-phase bridge inverter. The super capacitor can be used to both deliver and absorb transient power peaks which can prevent the battery from exposure of the power peaks which can improve the battery life..
Volvo Lastvagnar Ab


10/22/15
20150303859 

Motor drive apparatus


A motor drive apparatus includes multiple inverter circuits provided corresponding, respectively, to multiple motors, a controller configured to control the inverter circuits using switching signals, a detector configured to detect a current ripple generated by switching operations of the inverter circuits. The controller operates in a first mode and a second mode.
Denso Corporation


10/22/15
20150303844 

Inverter device


An inverter device includes a source current calculator and an inverter circuit, wherein: the source current calculator calculates an average value of the dc bus current ical during a pwm cycle through arithmetic operation executed based upon instantaneous values of the dc bus current idc of the inverter circuit; and the source current calculator provides an estimated value by designating the average current value ical during the pwm cycle as an input source current isrc during the pwm cycle.. .
Hitachi Automotive Systems, Ltd.


10/22/15
20150303829 

Stacked voltage source inverter with separate dc sources


A stacked voltage source inverter having separate dc sources is described herein. This inverter is applicable to low or medium voltage, low to medium power applications such as photovoltaic utility interface systems, battery storage application such as peak shaving with renewables, motor drive applications and for electric vehicle drive systems.

10/15/15
20150295514 

Inverter device


An inverter device includes an inverter circuit, which has switching elements in a bridge connection, a capacitor, which is connected in parallel to the input side of the inverter circuit, a temperature detector, which detects the temperature of the capacitor, a battery charge information acquisition section, which acquires charge information related to a battery connected to the input side of the inverter circuit, and a warm-up controller. When the temperature of the capacitor detected by the temperature detector is lower than a prescribed temperature, the warm-up controller determines a warm-up current based on the battery charge information acquired by the battery charge information acquisition section and the temperature of the capacitor detected by the temperature detector, and controls the switching elements of the inverter circuit to supply the warm-up current to the coil of an electric motor connected to the output side of the inverter circuit..

10/15/15
20150295490 

Inverter device


An inverter device includes an inverter circuit, which has switching elements in a bridge connection, a capacitor, which is connected in parallel to the input side of the inverter circuit, a control device, which controls the inverter circuit, a temperature detector, which detects the temperature of the capacitor, a degree-of-deterioration determiner, which determines the degree of deterioration of the capacitor, and a warm-up controller. When the temperature of the capacitor detected by the temperature detector is lower than a prescribed temperature, the warm-up controller controls the switching elements of the inverter circuit to supply a direct current set based on the degree of deterioration and the temperature of the capacitor to the coil of an electric motor connected to the output side of the inverter circuit..

10/08/15
20150289391 

Power conversion apparatus and electric vehicle


The metallic case of a power conversion apparatus includes a casing having a side wall, as well as an upper case and a lower case, a first area being formed between a cooling jacket provided at the inner periphery of the side wall and the lower case, the metal base plate dividing the first area between the cooling jacket and the upper case into a lower side second area and an upper side third area, first and second power modules being fastened to a top surface and a capacitor module being provided in the first area, driving circuits that drive inverter circuits of the power modules respectively being provided in the second area, and a control circuit that controls the driver circuits being provided in the third area.. .

10/08/15
20150285256 

Inverter-integrated electrical compressor


Provided is an inverter-integrated electrical compressor in which an inverter device has fewer components and a simpler configuration, is more compact, and is lower in cost, and the electrical compressor is made smaller, more lightweight, and lower in cost, with only one substrate being used and the need being eliminated for a large installation surface having a raised partitioning wall on which a semiconductor switching element is installed. The inverter-integrated electrical compressor is provided with an inverter-accommodating case (2) partitioned by a partitioning wall (3) and a low-pressure refrigerant channel inside a housing, an inverter device (1) being incorporated within the inverter-accommodating case (2); wherein the inverter device (1) is provided with a plurality of high-voltage electric components (5, 6) constituting a filter circuit, a plurality of semiconductor switching elements (7), and a control substrate (8) on which an inverter circuit and a control circuit are mounted; and the plurality of semiconductor switching elements (7) are installed in a fixed manner on the side surfaces (17) of a heat-radiating block (16) provided perpendicularly relative to the partitioning wall (3)..

10/01/15
20150280716 

Buffer circuit with reduced static leakage through controlled body biasing in fdsoi technology


A buffer includes an input configured to receive a first digital signal having first and second logic states referenced, respectively, to a first high voltage and a first low voltage of a first supply domain. A first inverter circuit includes a pmos transistor and nmos transistor having gate terminals connected to the input.
Stmicroelectronics International N.v.


10/01/15
20150280620 

Motor drive device


There is provided a motor drive device including, a current detection section that detects current flowing between a power source and an inverter circuit generating voltage to be supplied to a motor, a voltage control section that outputs a first control signal to cause the inverter circuit to generate a voltage for rotating the motor at a rotation speed based on an instructed value, and a rotation speed suppression section that, in cases in which current, detected by the current detection section at a timing at which a voltage generated by the inverter circuit rises from low level to high level, is a predetermined threshold value or higher, outputs a second control signal to the voltage control section to cause the inverter circuit to generate a voltage for rotating the motor at a lower rotation speed than the rotation speed based on the instructed value.. .
Asmo Co., Ltd.


10/01/15
20150280609 

Load driving device


A motor driving device includes a failure detector detecting the failure of switching elements and diodes of an inverter circuit. When the failure detection unit detects a failure according to which a switching element of a phase c upper stage is not conducting, but does not detect a failure according to which the diode connected is not conducting, a motor is driven using the switching element paired with the faulty switching element and the switching elements of the other phase.
Omron Automotive Electronics Co., Ltd.


10/01/15
20150280603 

Power conversion apparatus and air-conditioning apparatus using the same


A power conversion apparatus includes: a first smoothing capacitor and a second smoothing capacitor connected in parallel to each other, an inrush current preventing circuit connected in series to the first smoothing capacitor, the inrush current preventing circuit including an inrush preventing resistor for suppressing an inrush current and a first relay connected in parallel to the inrush preventing resistor; a second relay connected in series to the second smoothing capacitor; an inverter circuit for converting the output smoothed by the first smoothing capacitor and the second smoothing capacitor into an ac voltage and outputting the ac voltage to a load; and relay controlling means for controlling a switching operation of the first relay and the second relay.. .
Mitsubishi Electric Corporation






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