|| List of recent Inverter-related patents
| Motor control device and motor control method|
A motor control device includes an energization pattern output portion and an inverter circuit. The energization pattern output portion cyclically outputs a plurality of energization patterns.
| Solar photovoltaic three-phase micro-inverter and a solar photovoltaic generation system|
The invention provides a solar photovoltaic three-phase micro-inverter, comprising dc terminals, connected with three dc photovoltaic assemblies for receiving dc; three single-phase inverter circuits, having dc input terminals connected with the dc photovoltaic assemblies via the terminals, for converting the dc to ac; ac terminals, connected with the ac output terminals of the inverter circuits and a three-phase ac power grid, for outputting the ac generated by the inverter circuits; wherein dc input terminals of each inverter circuit are connected in parallel with each other, and ac output terminals are connected with one phase of the three-phase ac power grid and a neutral wire via the ac terminals. The invention further provides a solar photovoltaic generation system.
|Driver circuit, display device including the driver circuit, and electronic appliance including the display device|
An object of the present invention is to provide a driver circuit including a normally-on thin film transistor, which driver circuit ensures a small malfunction and highly reliable operation. The driver circuit includes a static shift register including an inverter circuit having a first transistor and a second transistor, and a switch including a third transistor.
|Gas cooled traction drive inverter|
The present invention provides a modular circuit card configuration for distributing heat among a plurality of circuit cards. Each circuit card includes a housing adapted to dissipate heat in response to gas flow over the housing.
|Dc to ac power converter|
A direct current to alternating current converter method and apparatus is disclosed that may comprise a direct current (dc) input source; an alternating current (ac) output inverter circuit, having an input connected across the dc input source; a partial power dc-dc boosting circuit intermediate to the dc input source and the dc input of the inverter stage, configured to increase the input voltage of the dc input source whenever the input voltage falls below a minimum required to synthesize an output waveform of a selected shape and a partial power dc-dc boosting circuit intermediate to the dc input source and the dc input of the inverter stage, configured to increase the input voltage of the dc input source during higher amplitude portions of inverter circuit output voltage waveform.. .
|Multiple strike ballast with lamp protection for electrodeless lamp|
A multi-strike ballast to ignite an electrodeless lamp is disclosed, and includes an inverter circuit, a protection circuit, and a controller. The inverter circuit, upon activation, sends an ignition pulse to the lamp.
|Three phase boost converter to achieve unity power factor and low input current harmonics for use with ac to dc rectifiers|
A voltage source inverter comprises a zigzag transformer providing a neutral point. A rectifier unit comprises three single phase boost converters each connected to one of the three phases of ac power and the neutral point and comprising a bridge rectifier converting single phase ac power to dc power and using a boost inductor with a boost switch and blocking diode to develop a dc output.
|Synchronous rectifier control techniques for a resonant converter|
A resonant converter system includes a first stage having inverter circuitry and resonant tank circuitry configured to generate an ac signal from a dc input signal, a transformer configured to transform the ac signal, and a second stage. The second stage features synchronous rectifier (sr) circuitry including a plurality of sr switches each having a body diode and sr control circuitry.
|Winding synchronous machine having a moving object including an inverter circuit, and method for controlling same|
The present invention relates to a winding synchronous machine having a moving object including an inverter circuit, wherein a winding synchronous machine, including a winding synchronous motor or generator having a moving object including an inverter circuit, is provided, the winding synchronous machine being characterized by comprising: a moving-object inverter circuit connected to the moving object of the winding synchronous machine; and a moving-object circuit control device connected to the moving-object inverter circuit so as to control the moving-object inverter circuit. According to the provided winding synchronous machine, the moving-object circuit control device is characterized by comprising: a stator inverter voltage estimator estimating a high-frequency voltage of a stator inverter circuit; a field current reference generator generating a field current reference of the moving object; and an energy storage device voltage controller generating a current reference tracking a dc-link energy storage device voltage of the moving object.
|Inverter device and electric power tool|
An inverter device includes: an inverter circuit configured to perform on/off operations with a preset duty cycle to convert a dc power into an ac power and output the ac power to an ac motor; and a controller configured to change a duty cycle of the on/off operations.. .
|Cascaded h-bridge (chb) inverter level shift pwm with rotation|
Cascade h-bridge inverters and carrier-based level shift pulse width modulation techniques are presented for generating inverter stage switching control signals, in which carrier waveform levels are selectively shifted to control thd and to mitigate power distribution imbalances within multilevel inverter elements using either complementary carrier or complementary reference modulation techniques.. .
|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..
|Level shifting circuit with adaptive feedback|
An amplifier has a first pull-up path coupled between a voltage supply node and an output node, and a pull-down path coupled between the output node and a ground supply node. A second pull-up path is coupled between the voltage supply node and the output node.
|Esd protective circuit|
Circuit protecting against electrostatic discharge (esd) includes a bias circuit connected in between a first power terminal and a second power terminal. The bias circuit includes a resistor circuit and a diode circuit.
The present invention includes: an electrolytic capacitor that smoothes a rectified voltage to a direct voltage; an inverter circuit that generates an alternating voltage from the direct voltage, to drive an electric motor; a controlling device that controls drive of switching elements included in the inverter circuit; and a temperature measuring device that measures a temperature of the electrolytic capacitor, to output the measured temperature to the controlling device, in which, when the temperature obtained by the temperature measuring device is lower than a predetermined target temperature, the controlling device supplies the electric motor with a current which is restricted so that a ripple voltage of the direct voltage falls within an allowable range, before starting a normal operation of the electric motor, so that the temperature of the electrolytic capacitor is raised to the target temperature. Thus, the electrolytic capacitor can be used even in a lower-temperature environment..
|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.
|Discharge lamp electronic ballast luminaire and vehicle with same|
Discharge lamp electronic ballast includes dc-dc converter circuit for converting voltage of dc power supply to output dc power, inverter circuit for converting dc power into ac power to supply it to discharge lamp, output feedback control circuit for controlling dc-dc converter circuit, and inverter driving signal generator circuit for controlling inverter circuit. Ballast includes microcomputer having voltage detecting function for detecting voltage value of dc power supply, and ballast temperature detector circuit for detecting temperature of ballast.
|Protection element, semiconductor device, and electronic system|
A protection element includes a first wiring line configured to be supplied with a signal voltage when electric current is on; a second wiring line configured to be supplied with a criterion voltage; a detection circuit connected between the first wiring line and the second wiring line, and configured to detect the signal voltage inputted onto the first wiring line; an inverter circuit including a plurality of inverters connected between the first wiring line and the second wiring line, and configured to be supplied with a reference voltage having a same level as that of the signal voltage between an odd-numbered inverter and an even-numbered inverter when electric current is on; and a protection transistor connected between the first wiring line and the second wiring line, and having a gate configured to receive output of the inverter circuit.. .
|Temperature-insensitive ring oscillators and inverter circuits|
A ring oscillator includes a plurality of stages of delay cells coupled in serial. At least one delay cell includes a first inverter.
|Rotary electric machine control apparatus and electric power steering apparatus using the same|
An inverter circuit converts electric power supplied to a motor by on/off operations of fets. A microcomputer controls driving of the motor by controlling the on/off operations of the fets.
|Semiconductor device and production method|
The object to provide a semiconductor device comprising a highly-integrated sgt-based cmos inverter circuit is achieved by forming an inverter which comprises: a first transistor including; an first island-shaped semiconductor layer; a first gate insulating film; a gate electrode; a first first-conductive-type high-concentration semiconductor layer arranged above the first island-shaped semiconductor layer; and a second first-conductive-type high-concentration semiconductor layer arranged below the first island-shaped semiconductor layer, and a second transistor including; a second gate insulating film surrounding a part of the periphery of the gate electrode; a second semiconductor layer in contact with a part of the periphery of the second gate insulating film; a first second-conductive-type high-concentration semiconductor layer arranged above the second semiconductor layer; and a second second-conductive-type high-concentration semiconductor layer arranged below the second semiconductor layer.. .
|Method and apparatus for providing welding type power|
A welding-type power supply includes a controller, a preregulator, a preregulator bus, and an output converter. The controller has a preregulator control output and an output converter control output.
|Multi-level voltage converter|
A multi-level voltage converter includes a multi-point converter circuit and at least one full bridge inverter circuit. The multi-point converter circuit is configured for converting a dc voltage into an intermediate multi-level voltage.
An inverter includes a warm-up control section and a switching control section. In a state in which an electric motor is not operating, the warm-up control section controls switching elements of an inverter circuit to perform warm-up control, in which direct currents are supplied to the coils of the respective phases of the electric motor, when the temperature of the capacitor is lower than a prescribed temperature.
|Wireless power transfer method, apparatus and system|
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.. .
|Complementary bipolar inverter|
An example embodiment is a complementary transistor inverter circuit. The circuit includes a semiconductor-on-insulator (soi) substrate, a lateral pnp bipolar transistor fabricated on the soi substrate, and a lateral npn bipolar transistor fabricated on the soi substrate.
|State definition and retention circuit|
State definition and retention circuits are described. In one embodiment, a circuit includes two cross-connected pmos transistors, first, second, and third nmos transistors coupled to the pmos transistors, an inverter circuit, and an output transistor connected to the pmos transistors and to an output terminal of the circuit.
|Electric power tool|
An electric power tool includes: a brushless motor having a plurality of stator windings and configured to rotate in accordance with voltages applied to the plurality of stator windings, an induced voltage being generated in accordance with a rotation of the brushless motor; a rectifier circuit configured to rectify an ac voltage; a smoothing capacitor configured to smooth the ac voltage rectified by the rectifier circuit to a pulsation voltage having a maximum value larger than the induced voltage and a minimum value smaller than the induced voltage; and an inverter circuit configured to perform switching operations to output the pulsation voltage to the plurality of stator windings by rotation.. .
|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)..
|Power conversion apparatus|
A power conversion apparatus includes an inverter circuit including a switching element, a system voltage measurement unit measuring a system voltage of a power system, a voltage drop detector detecting a voltage drop of the power system, a carrier wave generator generating a carrier wave, a carrier wave frequency modulator increasing a frequency of the carrier wave, when the voltage drop is detected, a signal wave generator generating a signal wave to control the inverter circuit, a gate signal generator comparing the carrier wave with the signal wave, and generating a gate signal, and a power conversion controller controlling the inverter circuit, based on the gate signal.. .
|Power conversion apparatus|
A power conversion apparatus includes an inverter circuit, a system voltage measurement unit measuring a system voltage, a voltage drop detector detecting a voltage drop of a power system, based on the system voltage, a direct current power measurement unit measuring a direct current power to be input into the inverter circuit, an alternating current command value calculator calculating an alternating current command value to control an alternating current output from the inverter circuit, based on the direct current power and the system voltage, and a current limiter that decrease a current limit value to limit the alternating current command value, when the voltage drop is detected.. .
|Solar photovoltaic three-phase micro-inverter and solar photovoltaic power generation system|
A solar photovoltaic three-phase micro-inverter comprises: dc terminals, coupled with three dc photovoltaic assemblies adjacent to each other; three single-phase inverter circuits having input terminals coupled respectively with the three dc photovoltaic assemblies via the dc terminals, for converting the dc currents generated by the three dc photovoltaic assemblies to ac currents, respectively; ac terminals coupled with a three-phase ac power grid; wherein output terminals of each single-phase inverter circuit are coupled respectively with a neutral wire and one of the three phases of the three-phase ac power grid. A solar photovoltaic power generation system is also provided.
|Induction heating apparatus capable of avoiding unstable heating due to limitation of heating output|
When the control unit makes both the first and second inverter circuits operational, the control unit controls the first and second inverter circuits by duty control such that an average heating output from the first inverter circuit reaches a predetermined first target heating output, and an average heating output from the second inverter circuit reaches a predetermined second target heating output. When the control unit makes one of the first and second inverter circuits operational in an automatic heating mode for automatic heating control according to a predetermined heating output sequence, the control unit inhibits the first and second inverter circuits from being controlled by the duty control..
|Aircraft motor drive control apparatus and aircraft actuator hydraulic system|
A controller that performs pulse width modulation control of a three-phase inverter circuit includes a three-phase modulation voltage command value generation unit, a two-phase modulation voltage command value generation unit, a voltage command switching unit, and a pwm signal output unit. The voltage command switching unit switches a voltage command value to a two-phase modulation voltage command value when a determination value becomes larger than or equal to a first threshold value, and switches the voltage command value to a three-phase modulation voltage command value when the determination value becomes smaller than a second threshold value, which is smaller than the first threshold value..
|Distributed power supply system|
The disclosed distributed power supply system does not become disconnected from a grid simultaneously with others when the grid voltage falls instantaneously. In a distributed power supply device which controls an inverter circuit 10 based on a control signal obtained by comparing a predetermined carrier signal and voltage command signals of three phases and which converts dc power to ac power and supplies the ac power to a power grid of a three-phase ac power supply, fundamental wave signals of three phases are generated from a grid voltage of the three-phase ac power supply.
|Current-fed full-bridge dc-dc converter|
A current-fed full-bridge dc-dc converter includes a current source circuit including a direct-current voltage source circuit and a reactor connected to the direct-current voltage source circuit in series, an inverter circuit including switching elements, input terminals and output terminals, wherein outputs of the current source circuit are connected to the input terminals, a transformer having a primary coil that is connected to the output terminals and a secondary coil and a rectifier circuit which is connected to the secondary coil and through which the current-fed full-bridge dc-dc converter generates direct-current output. The current-fed full-bridge dc-dc converter further includes a capacitor connected to the output terminal and the primary coil in series and a controller controlling on/off operations of the switching elements so that a current can flow from the current source circuit through the primary coil and the capacitor in stopping of the current-fed full-bridge dc-dc converter..
|Method and device to protect an esp power supply from transient over-voltages on the power grid|
A power supply converter unit is disclosed, in particular for an electrostatic precipitator, converting the frequency of alternating input supply (1) to high frequency alternating output (ua, ub) by rectifying the alternating input supply (1) in a rectifier (12) to a direct current (udc), which is converted to alternating-current in a full bridge inverter (13) in a h-bridge circuit with switches (48) controlled by a control unit (23). According to the invention on the input side of the rectifier (12) and/or in the direct current (udc) section there is provided at least one overvoltage protection circuitry (34, 35, 37-39, 45).
|Level shifter circuit and gate driver circuit including the same|
There are provided a level shifter circuit and a gate driver circuit including the same. The level shifter circuit includes: a plurality of switching devices connected to a predetermined dc power supply through a resistor and operated by different driving signals; a gain conversion unit operated by first signals output from the plurality of switching devices, respectively, and generating second signals having a level within a predetermined range of the first signals; and a noise removal unit connected to at least one output terminal among the plurality of switching devices to prevent malfunctioning of the gain conversion unit, wherein the gain conversion unit inputs the second signals to a high side gate driver circuit through an inverter circuit..
|Power conversion apparatus|
Technology leading to a size reduction in a power conversion apparatus comprising a cooling function and technology relating to enhancing productivity and enhancing reliability necessary for commercial production are provided. Series circuits comprising an upper arm and lower arm of an inverter circuit are built in a single semiconductor module 500.
|Photovoltaic system power optimization|
An example system may comprise at least one solar panel including a plurality of photovoltaic cells, wherein the photovoltaic cells are grouped into at least a first group of cells and a second group of cells. The first and second groups of cells may be coupled in series to a dc bus to deliver dc voltage and power to the dc bus.
|Power conversion apparatus|
A dc link is provided, which includes a capacitor connected in parallel to an output of a converter circuit, and outputs a pulsating dc link voltage. An inverter circuit is provided, which converts an output of the dc link to ac by switching, and supplies the ac to a motor connected thereto.
|Wireless electrical power transmission system and its control method|
The present invention provides a wireless electrical power transmission system and its control method with good thermal stability. Said system, comprising a transmitting coil frequency generating part and a coil frequency phase tracking and feedback part, the transmitting coil frequency generating part composed of a control circuit, a driving circuit and an inverter circuit, the coil frequency phase tracking and feedback part composed of a frequency detection circuit and a phase locked loop circuit, is characterized in that said control circuit is controlled by software to output two opposite control signals, each of which controls opening and closing of a switch tube after passing through the driving circuit to generate high-frequency oscillation in the coil..
|Inverter circuit having a junction gate field-effect transistor|
An example inverter circuit assembly includes at least one first transistor device and at least one second transistor device. The second transistor device comprises a silicon carbide junction gate field-effect transistor.
|Contactless power transfer system|
A half-bridge inverter is used for a high frequency alternating current power supply to be connected to a primary side of a contactless power transformer, and a voltage-doubler rectifier is used to convert a secondary-side alternating current output of the contactless power transformer into a direct current.. .
When a semiconductor device is provided with an inverter comprising a transistor having a first gate and a second gate, the semiconductor device does not require a circuit for generating a potential to be input to the second gate of the transistor and has a small number of wirings. Moreover, a semiconductor device having high reliability is provided.
|Cascaded h-bridge (chb) inverter level shift pwm with rotation|
Cascade h-bridge inverters and carrier-based level shift pulse width modulation techniques are presented for generating inverter stage switching control signals, in which carrier waveform levels are selectively shifted to control thd and to mitigate power distribution imbalances within multilevel inverter elements.. .
|Controller for an inverter circuit, inverter, and method for operating an inverter|
Damage to an inverter due to an excessively high start-up current, when using space vector control without a voltage sensor in conjunction with small connection inductances, can be prevented with a method for controlling the inverter, and with a corresponding controller, wherein the controller is configured to transmit in a start-up phase of an inverter circuit a control signal to a control input of the inverter circuit, wherein the control signal simultaneously switches three first semiconductor switches, which are connected to a first dc voltage terminal of the inverter circuit, temporarily into a conducting state.. .
|Inverter control device, electric compressor, and electric device|
An inverter control device of the present invention operates by synchronous commutation in which a commutation signal waveform is output with an electric angle of less than 180 degrees at a predetermined frequency according to a target rotation speed of a brushless dc motor. In order to maintain an induced voltage phase of a brushless dc motor at a predetermined phase with respect to an output voltage of an inverter circuit unit, even in an operation by the synchronous commutation, the output voltage of the inverter circuit unit is changed according to a change in state of the induced voltage phase of the brushless dc motor to continue a running state of the motor.
|Power inverter circuit|
A power inverter circuit 1 is a bridge power inverter circuit comprising first and second switching elements 11, 12 sequentially connected in series between input terminals on higher and lower voltage sides and third and fourth switching elements 13, 14 sequentially connected in series between the input terminals on the higher and lower voltage sides and alternately turning on a set of the first and fourth switching elements 11, 14 and a set of the second and third switching elements 12, 14 so as to convert a dc power fed between the input terminals on the higher and lower voltage sides into an ac power. One of the sets of the first and third switching elements 11, 13 and the second and fourth switching elements 12, 14 is subjected to switching control at a frequency higher than that of the other..
|Load filters for medium voltage variable speed drives in electrical submersible pump systems|
A medium voltage drive for driving a motor of an electric submersible pump can include inverter circuitry that includes an output for output of power and a load filter connected to the output that includes inductors and capacitors that include inductance (l) and capacitance (c) values that determine a resonance frequency (fr) value within a range from approximately 750 hz to approximately 1000 hz according to the equation fr=(2π(lc)0.5)−1. Various other apparatuses, systems, methods, etc., are also disclosed..
|Bus circuit and semiconductor device|
A bus circuit which transfers data of a plurality of bits output from one module to another module, includes: a data bus; a division circuit configured to divide the data into a plurality of pieces of divided data including a plurality of bits in a number equal to or less than half a bit width of the data bus; an inverter circuit configured to generate a plurality of pieces of inverted divided data by inverting each of the plurality of pieces of divided data; an output circuit configured to output each of the plurality of pieces of divided data and each of the pieces of inverted divided data corresponding to each of the pieces of divided data as a data pair; and a coupling circuit configured to extract and couple the plurality of pieces of divided data from the data pair received from the data bus.. .
|Power converter device for driving solid state lighting load|
A power converter device for converting power from a mains power supply (201) to power a solid state lighting load (280) includes a converter (230) and a control circuit (350). The converter (230) includes a half-bridge inverter (220) that functions as a boost inverter and output stage inverter, the half-bridge inverter having multiple switches (221, 222).
|Isolator circuit and semiconductor device|
An isolator circuit capable of two-way electrical disconnection and a semiconductor device including the isolator circuit are provided. A data holding portion is provided in an isolator circuit without the need for additional provision of a data holding portion outside the isolator circuit, and data which is to be input to a logic circuit that is in an off state at this moment is stored in the data holding portion.
|Power converting apparatus|
The invention has a power converting apparatus including a first inverter circuit connected to a dc power supply side; and a second inverter circuit connected to a load side, wherein the first inverter circuit converts dc power from the dc power supply into power having an absolute waveform of an ac waveform, and the second inverter circuit converts the power of the absolute waveform every single cycle thereof into ac power by alternately inverting the power.. .
|Control electronics for brushless motors|
An electronic control circuit for a brushless motor has an input power circuit providing a dc voltage and a microcontroller integrated circuit receiving the dc voltage. The microcontroller integrated circuit provides three-phase control signals according to a space vector control method.
|Inverter assembly and solar power plant comprising the same|
An inverter assembly having a dc circuit, inverter, and controller (ctrl) configured to control the inverter, the inverter being, for example, a multilevel inverter having a first half bridge (hb1) and a second half bridge (hb2). The controller (ctrl) can be adapted to provide a first operating state in which the controller (ctrl) operates the inverter as a full-bridge inverter.
|Electric motor and electrical apparatus equipped with same|
An electric motor includes a magnet rotor which is placed with an air gap interposed between it and a stator and has a magnetic pole portion formed from a plastic magnet which swells by hydrogen bonds, an inverter circuit, a dc-voltage conversion portion, a driving logic control portion, a supply current value control portion, a current value designation portion, a reference current value designation portion, and a correlation designation portion, wherein the correlation designation portion determines an average current value by changing the average current value linearly or non-linearly with respect to a reference current value, and the magnetic pole portion absorbs moisture to swell, thereby making the air gap smaller, at higher humidity than a reference humidity.. .
|Motor drive apparatus|
When a failure detection part detects a failure in an inverter circuit in a first power supply system, a drive control part stops the inverter circuit from driving a motor. An on/off control part turns off a first power supply relay of a power supply on/off part.
|Versatile zero-voltage switch resonant inverter for industrial dielectric barrier discharge generator applications|
A power system for a dielectric barrier discharge system, such as used for generating ozone, can include a full bridge inverter stage and parallel resonant tank outputting a signal for powering a dielectric barrier discharge cell stack. The inverter stage is controlled using a combination of pulse width modulation (pwm) and frequency modulation (fm) to enable soft switching through all load conditions—from full load to light load.
|Anode rotational drive device and x-ray imaging apparatus|
In order to provide an x-ray imaging apparatus including a two-phase anode rotation mechanism driving circuit having a small and light configuration, one end of the main stator coil is connected to a three-phase full-bridge inverter circuit and the midpoint between two semiconductor switches of the first arm, one end of the auxiliary stator coil is connected to the midpoint between two semiconductor switches of the second arm, and the other ends of the main stator coil and the auxiliary stator coil are connected to the midpoint between two semiconductor switches of the third arm. The semiconductor switches are switched using an inverting circuit and a delay circuit so that a first ac voltage is supplied to the one end of the main stator coil and a second ac voltage, which is shifted in phase by 90° from the first ac voltage, is supplied to the one end of the auxiliary stator coil..
A shift register is provided in which leakage of charges from a voltage at a set node is prevented to stabilize an output from a stage. The shift register includes stages for sequentially outputting scan pulses.
|Switching power supply device|
A switching power supply device includes: a chopper circuit that adjusts a dc voltage input through a reactor to a desired dc voltage by performing an on/off operation of a switching element; an inverter circuit that converts an output of the chopper circuit into a desired ac voltage; a first capacitor that is provided on a side of the inverter circuit relative to the switching element; a second capacitor that is provided on a side of the inverter circuit relative to the switching element; and a resistor that is in a resonant loop formed by three constituent elements that are the first capacitor, the second capacitor, and a wiring inductance between the chopper circuit and the inverter circuit, where the resistor is connected in series to the second capacitor and inserted between the dc bus-bars.. .
|Circuit for parallel bit test of semiconductor memory device|
A circuit for a parallel bit test (pbt) of a semiconductor memory device is provided. The pbt circuit includes a comparator circuit and an inverter circuit.
|Control device for electric vehicle|
A control device for an electric vehicle includes a converter circuit that converts a voltage input from an external power supply to a direct current having a predetermined value and outputs the direct current to a power storage unit, an inverter circuit that receives an arbitrary power supply from the external power supply or the power storage unit and converts power to an alternating current having a predetermined value, a converter control unit that controls the converter circuit based on a detection result of an abnormal state of the converter circuit and generates a protection status signal based on the detection result, and a inverter control unit that executes emergency control with respect to the inverter circuit, when the protection status signal is input, which indicates that the converter circuit is in an abnormal state.. .
|Emission driving unit, emission driver, and organic light emitting display device having the same|
In one aspect, an emission driving unit and an organic light emitting diode (oled) display having the same are disclosed. The emission driving unit includes an input signal generating circuit that receives a flm signal according to a first clock signal, receives a second clock signal according to the flm signal, and outputs a sequential input signal.