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This page is updated frequently with new Inverter Circuit-related patent applications. Subscribe to the Inverter Circuit RSS feed to automatically get the update: related Inverter RSS feeds. RSS updates for this page: Inverter Circuit RSS RSS


Switch driving circuit, inverter apparatus and power steering apparatus

Uninterruptible power supply

Welding-current control method of the resistance welding machine and welding-current control device

Date/App# patent app List of recent Inverter Circuit-related patents
07/03/14
20140185415
 Alarm device for banishment of birds and animals patent thumbnailAlarm device for banishment of birds and animals
This utility model releases an alarm device for banishment of birds and animals, which includes: radio transmission module, voltage stabilizing circuit and inverter circuit. The radio transmission module sends radio signals to radio receiver module which then transmits such radio signals to the pc control circuit; the said pc control circuit sends instruction signals to the audio circuit which then transmits the audio signal to amplification circuit which outputs the amplified audio signals; the said voltage stabilizing circuit provides 5v power supply to the said radio transmission module, radio receiver module, the said pc control circuit and the said audio circuit, while the said inverter circuit provides +/−35v power supply to the said amplification circuit.
07/03/14
20140184107
 Switch driving circuit, inverter apparatus and power steering apparatus patent thumbnailSwitch driving circuit, inverter apparatus and power steering apparatus
A switch driving circuit electrically opens and closes a switch circuit including two n-channel type semiconductor switching elements series connected in a reverse direction, thereby electrically opening and closing a path between a dc power supply and an inverter circuit. The switch driving circuit has a reference potential point in common with the inverter circuit and supplies an opening/closing control signal to the switch circuit.
07/03/14
20140183959
 Uninterruptible power supply patent thumbnailUninterruptible power supply
An uninterruptible power supply is having a battery, a power inverter circuit for inverting the electrical power of the battery, and a voltage control circuit. The voltage control circuit controls the power inverter circuit, so that the output voltage of the power inverter circuit is maintained at a standby voltage lower than a rated voltage under the condition of a power failure detection signal being not output from an external power supply and the output voltage of the power inverter circuit equals the rated voltage under the condition of the power failure detection signal being output from the external power supply..
06/26/14
20140175065
 Welding-current control method of the resistance welding machine and welding-current control device patent thumbnailWelding-current control method of the resistance welding machine and welding-current control device
In spot welding, the condition tolerance for applying a large current in a short time into an aluminum alloy plate or the like is narrow, and also nugget crack sometimes occurs in spot welding. In the case of a mild steel plate, the expulsion sometimes occurs, and thereby a poor weld portion is formed.
06/12/14
20140160821
 Power conversion apparatus patent thumbnailPower 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.
06/05/14
20140151146
 Mold module utilized as power unit of electric power steering apparatus and electric power steering apparatus patent thumbnailMold module utilized as power unit of electric power steering apparatus and electric power steering apparatus
There is provided a mold module and an electric power steering apparatus in which the temperature distribution in electronic components such as semiconductor chips utilized in an electronic relay and an inverter circuit unit is equalized and hence the heat radiation performance can be improved. In a mold module according to the present invention, a plurality of terminals for forming wiring leads and a plurality of electronic components mounted on the respective terminals are molded with a molding resin; at least part of the plurality of terminals are exposed at the rear side of the molding resin; an electric power steering apparatus according to the present invention utilizes the mold module..
05/29/14
20140145677
 Apparatus for transferring energy using power electronics and machine inductance and method of manufacturing same patent thumbnailApparatus for transferring energy using power electronics and machine inductance and method of manufacturing same
A fraction inverter circuit includes a first energy storage device configured to output a dc voltage, a first bi-directional dc-to-ac voltage inverter coupled to the first energy storage device, and a first electromechanical device. The first electromechanical device includes a first plurality of conductors coupled to the first bi-directional dc-to-ac voltage inverter, a second plurality of conductors coupled together, and a plurality of windings coupled between the first plurality of conductors and the second plurality of conductors.
05/22/14
20140139127
 Electronic ballast with real-time current crest factor improvement function patent thumbnailElectronic ballast with real-time current crest factor improvement function
An electronic ballast includes a converter, an inverter circuit, a controlling unit, and a current crest factor improvement circuit. The controlling unit issues a first control signal to control the converter and issues a second control signal and a third control signal with opposite enabling/disabling states to control on/off states of corresponding switch elements of the inverter circuit.
05/22/14
20140137702
 Vehicle control system patent thumbnailVehicle control system
A vehicle control system (100) includes a rotary electric machine unit (40), a pcu (14) including an inverter circuit, and a controller (18). The rotary electric machine unit (40) includes a casing defining an interior space and containing a rotary electric machine and a lubricating cooling fluid disposed therein and a cover, and a breather (70) which is connected to the interior space via an on-off valve (58).
05/15/14
20140133198
 Reactive power compensator patent thumbnailReactive power compensator
A reactive power compensator according to an embodiment comprises: multilevel inverter circuits respectively constituting each of the three phases; a filter circuit for reducing harmonics connected between the output terminals of each of the multilevel inverter circuits and a power system interconnection terminal; and a control section for causing prescribed three-phase ac voltage to be output by controlling each of said multilevel inverter circuits. Each of the multilevel inverter circuits is constituted by connecting in series one or more single-phase full-bridge single-pulse inverters and is arranged to convert dc voltage to respective positive and negative single-pulse voltages once per cycle of the fundamental wave of the voltage instruction value..
05/15/14
20140132076
Solar photovoltaic three-phase micro-inverter system and a method for improving the conversion efficiency thereof
The invention provides a solar photovoltaic three-phase micro-inverter system comprising a plurality of three-phase micro-inverters. Every three of the three-phase micro-inverters form a group and are coupled to a three-phase ac power grid.
05/08/14
20140126316
Circuit and method for dynamically changing a trip point in a sensing inverter
A circuit and method for dynamically changing trip point voltage in a sensing inverter circuit. In one embodiment, the sensing inverter circuit includes: (1) a base inverter circuit couplable to logic-high and logic-low voltage sources at respective inputs thereof and configured to transition an output thereof from a previous logic-level voltage to a present logic-level voltage based on a logic value of an input voltage received by the base inverter circuit, and (2) a feedback circuit associated with the base inverter circuit and configured to employ the previous logic-level voltage to decouple one of the logic-high and logic-low voltage sources from one of the inputs and thereby shift a trip voltage of the base inverter circuit toward the input voltage..
05/08/14
20140126262
Inverter circuit
An inverter circuit includes a dc-ac inverter, a sampling circuit, a voltage-current conversion circuit, an isolation circuit and an electronic starter switch. The sampling circuit includes a first and a second diode connected in parallel and opposite in polarity.
05/01/14
20140117764
Ups systems and methods using mode-dependent grounding
A ups system includes an inverter circuit having an input coupled to a dc link and an output configured to be coupled to a load and a gang switch (e.g., a contactor) configured to couple and decouple the dc link to and from a dc power source and to couple and decouple a neutral point of the inverter circuit to and from a ground node. The gang switch may be configured to couple the neutral point to the ground node when the dc link is coupled to the dc power source and to decouple the neutral point from the ground node when the dc link is decoupled from the dc power source..
04/24/14
20140111262
Semiconductor device
An object is to provide a low-power semiconductor device which does not require a latch circuit to hold data at the output of inverter circuits. In the semiconductor device, an input of a first inverter circuit is connected to an input terminal through a source and a drain of a first transistor.
04/24/14
20140111109
High pressure discharge lamp lighting device, projector provided with the same, and high pressure discharge lamp lighting method
A calculation processing sub-unit 11 controls a frequency control sub-unit 13 and a dc-ac inverter circuit 6 to repeat an a-period and a b-period. The a-period continues for at least two cycles, each cycle including a period a1 during which the current is maintained in one polarity and a period a2 during which the current is maintained in an opposite polarity.
04/24/14
20140111089
Latching circuit for ballast
A ballast including a latching circuit is provided. The ballast includes an inverter circuit for providing an oscillating voltage signal to energize a lamp set, a control circuit for controlling operation of the inverter circuit, and a voltage supply circuit for providing a supply voltage to the control circuit.
04/17/14
20140107881
Working machine
Provided is a working machine capable of decreasing a voltage of a dc busbar (dc bus) with a configuration suppressing a degradation in reliability. A hybrid type construction machine as a working machine includes: a dc bus which is connected to a rotation motor via an inverter circuit, a battery which is connected to the dc bus via a step-up/step-down converter and a switch, a controller which drives the inverter circuit and the step-up/step-down converter, a cooling liquid circulating system which includes a pump motor, and an inverter circuit which is connected to the dc bus and driving the pump motor.
04/17/14
20140104897
Control method during zero-crossing operation of bridge arms in ups
A control method is disclosed that involves controlling zero-crossing operation of bridge arms in a ups, wherein the ups has a rectifying bridge with first and second switching transistors, a midline bridge arm with third and fourth switching transitors, and an inverter bridge arm with fifth and sixth switching transitors. The midline and rectifying bridge arms are controlled to cross zero synchronously.
04/17/14
20140103992
Biasing in cmos inverter
Biasing circuit for providing a supply voltage (vdd) for an inverter based circuit. The biasing circuit is provided on a same die as the inverter based circuit, and includes a first shorted inverter circuit (t1, t2) and a second shorted inverter circuit (t3, t4).
04/17/14
20140103851
Use of cooling fan in adjustable speed drives
Apparatuses and methods are described for implementing adjustable speed drives. For instance, an apparatus may comprise an inverter circuit configured to drive a multi-phase electrical load, the inverter configured to be powered by first and second direct-current (dc) bus lines, a fan drive circuit configured to be powered by the first and second dc bus lines, a fan configured to be controlled by the fan drive circuit and having a plurality of windings coupled together at an electrical node, a first capacitor having a first terminal coupled to the first dc bus line and a second terminal coupled to the electrical node, and a second capacitor having a first terminal coupled to the second dc bus lines and a second terminal coupled to the electrical node..
04/10/14
20140098588
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.. .
04/10/14
20140097775
Variable speed fan motor
A variable speed fan motor, including: a variable speed motor and a motor controller. The motor controller includes a microprocessor, an inverter circuit, a gear detection circuit, and a power supply unit.
04/10/14
20140097670
Vehicle auxiliary power supply
A vehicle auxiliary power supply that is mounted on a railway vehicle, includes a three-phase inverter circuit that converts dc power or ac power input from an overhead line to desired ac power to supply the ac power to a load, and is connected in parallel with a vvvf inverter device that drives a propulsion motor, wherein a blocking diode that prevents backflow from a side of the three-phase inverter circuit to a side of the overhead line is provided between the overhead line and the three-phase inverter circuit, and a sic schottky barrier diode is applied to the blocking diode.. .
04/10/14
20140097531
Power quad flat no-lead (pqfn) package in a single shunt inverter circuit
According to an exemplary implementation, a power quad flat no-lead (pqfn) package includes a driver integrated circuit (ic) situated on a leadframe. The pqfn package further includes low-side u-phase, low-side v-phase, and low-side w-phase power switches situated on the leadframe.
04/03/14
20140091738
Inverter circuit having switching means operating with linear operation
An inverter circuit for an electric motor includes a first terminal and a second terminal, via which the inverter circuit is connectable to an energy store. The inverter circuit also includes a parallel circuit having three half-bridge circuits located between the first terminal and the second terminal.
03/27/14
20140085955
Power conversion apparatus
The power conversion apparatus includes an inverter circuit which converts a dc current into an ac current and have a u-phase, v-phase, and w-phase power semiconductor modules, and a capacitor module for smoothing the dc current. Each of the power semiconductor modules is configured separately and connected to a first bus bar.
03/20/14
20140078809
Nonvolatile latch circuit, nonvolatile flip-flop circuit, and nonvolatile signal processing device
A nonvolatile latch circuit according to the present invention includes: a latch operating unit in which outputs of cross-coupled connected inverter circuit and inverter circuit are connected via a series circuit which includes a transistor, a variable resistance element, and a transistor in this order, and store and restore in a latch state are controlled by control terminals of the transistors; and a comparator circuit which compares a signal obtained by amplifying the value of the sum of potentials at both ends of the variable resistance element with the logic state of the latch operating unit, wherein writing to and reading from the variable resistance element are repeated until an output of the comparator circuit indicates that normal write operation has been performed.. .
03/20/14
20140076434
Motor-driven compressor for a vehicle
A first accommodation chamber accommodating therein an inverter unit with a built-in inverter circuit and a second accommodation chamber accommodating therein a filter unit with a built-in filter circuit are formed individually in different positions of a housing of a motor-driven compressor for a vehicle. The input terminals and the output terminals of the inverter unit and of the filter unit are all arranged so as to extend in the same direction..
03/13/14
20140070848
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.
03/06/14
20140062360
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.
03/06/14
20140062198
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.
02/27/14
20140056400
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.
02/27/14
20140055950
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.
02/20/14
20140049998
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.. .
02/20/14
20140049159
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.
02/13/14
20140043870
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.
02/13/14
20140043865
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.
02/13/14
20140042953
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.
02/13/14
20140042839
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.. .
02/06/14
20140035689
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..
02/06/14
20140035672
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.
01/30/14
20140029144
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.
01/30/14
20140028238
Inverter device
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..
01/30/14
20140028237
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.
01/30/14
20140028188
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.
01/23/14
20140022677
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.. .
01/23/14
20140022023
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.
01/23/14
20140021897
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.
01/23/14
20140021588
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.. .
01/23/14
20140021180
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.
01/16/14
20140016380
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.
01/16/14
20140015461
Inverter
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.
01/09/14
20140008758
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.
01/02/14
20140002134
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.
01/02/14
20140001993
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.. .
12/19/13
20130336028
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)..
12/19/13
20130336026
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.. .
12/19/13
20130336025
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.. .
12/19/13
20130334888
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.
12/19/13
20130334211
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..
12/12/13
20130330207
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..
12/12/13
20130328398
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.
12/05/13
20130322127
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..
12/05/13
20130320956
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..
11/28/13
20130314963
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.
11/21/13
20130307342
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.
11/14/13
20130300327
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.
11/14/13
20130300203
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..
11/07/13
20130294128
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.


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Inverter Circuit topics: Inverter Circuit, Semiconductor, Semiconductor Device, Semiconductor Switch, Silicon Carbide, Synchronous, Submersible Pump System, Resonance Frequency, Disconnect, Bus Circuit, Microcontroller, Microprocessor, Integrated Circuit, Regenerate, Switching Power Supply

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