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Inverter patents

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Piezoelectric element drive circuit

Date/App# patent app List of recent Inverter-related patents
 Percutaneous cable with redundant conductors for implantable blood pump patent thumbnailnew patent Percutaneous cable with redundant conductors for implantable blood pump
A blood pump system for left ventricle assist has an implantable pump unit having a multiphase stator having a plurality of windings connected between respective junctions for forming first, second, and third phases. An external control unit comprises an h-bridge inverter having first, second, and third phase legs.
 Piezoelectric element drive circuit patent thumbnailnew patent Piezoelectric element drive circuit
A piezoelectric element drive circuit includes an h bridge circuit, an lpf-attached differential amplifier circuit, an amplifier circuit, and an inverter circuit. First and second drive signals output from the h bridge circuit and having opposite phases are applied to a piezoelectric element.
 Vacuum pump patent thumbnailVacuum pump
An estimating section detects a signal including counter electromotive voltage information of the motor, and estimating a magnetic pole electric angle and a rotational speed of the motor. A driving current controller repeats generation and cut-off of the driving current supplied from a power supply to the motor via the inverter circuit or regenerated from the motor to the power supply in a low-speed period between a stopped state and a predetermined rotational speed in an accelerating operation at a motor starting time or a decelerating operation at a motor stopping time.
 Bidirectional power converter patent thumbnailBidirectional power converter
A bidirectional power converter that can be used in an electric vehicle to perform ac to dc power conversion to charge the electric vehicle's battery and to perform dc to ac power conversion to export power to run external electrical loads is described. The bidirectional power converter may include an ac interface coupled to a cyclo-inverter circuit, and a dc interface coupled to a h-bridge circuit.
 Dc-ac inverter with soft switching patent thumbnailDc-ac inverter with soft switching
Provided are single phase and multiple phase dc-ac inverters with soft switching, and related methods and uses. The dc-ac inverters comprise at least one voltage source inverter circuit or at least one current source inverter circuit having a dc input and an ac output including a first component at a fundamental frequency and a ripple component at a frequency higher than the fundamental frequency; wherein the ripple component is of a sufficient magnitude that the voltage source inverter circuit output current reverses polarity and allows the at least one inverter circuit to operate with zero voltage switching; or wherein the ripple component is of a sufficient magnitude that the current source inverter circuit output voltage reverses polarity and allows the at least one inverter circuit to operate with zero current switching.
 Converter topologies patent thumbnailConverter topologies
Inverter topologies for converting an input direct current (dc) waveform from a dc source to an output alternating current (ac) waveform are disclosed. In some disclosed embodiments, an inverter may include a full bridge llc resonant converter, a first boost converter, and a second boost converter.
 Drive control device and drive control method for motor patent thumbnailDrive control device and drive control method for motor
The present invention provides a motor drive control device provided with a shutoff circuit employing semiconductor relays and configured to drive a motor by a duty ratio control of an inverter, which stably drives the motor even in an operation state that drive duty ratio of phases are uneven. In the motor drive control device, output lines of three phases of the inverter circuit are connected to phases of the motor and further connected to a booster circuit, an output boosted by the booster circuit at a time of drive of the motor is distributed to semiconductor relays connected to respective phases of the motor, and furthermore, a switching circuit for stopping actuation of the booster circuit to shut off drive of the motor, is interposed in a line for supplying an electric power to the booster circuit..
 Motor drive device patent thumbnailMotor drive device
The present invention relates to a motor drive device having a drive circuit for driving a power supply relay and a phase relay providing a fail-safe function. The motor drive device includes: an inverter circuit for supplying electric power to an electric motor; a power supply relay provided on a power supply line for supplying electric power from a power supply to the inverter circuit; a phase relay provided on a drive line between the inverter circuit and the electric motor, and constituted by a semiconductor switching element; and a drive circuit connected to the phase relay and the power supply relay.
 Level shifting circuit with adaptive feedback patent thumbnailLevel 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.
 Electronic ballasts patent thumbnailElectronic ballasts
Methods and apparatus are described that can provide improved power factor correction and total harmonic distortion, efficiency and/or direct feedback of load current variations to a power source inverter. In one example, a power supply, for example, a ballast, can have an input circuit, an output circuit and an inverter circuit coupled between the input circuit and the output circuit.
Ballast with current control circuit
A ballast configured to connect to a set of lamps to energize the set of lamps is provided. The ballast comprises an inverter circuit for generating an oscillating power signal, wherein the oscillating power signal has a frequency, and a resonant tank circuit electrically connected to the inverter circuit for receiving the oscillating power signal and therefrom providing a lamp current to the set of lamps.
Inverter control circuit and inverter circuit
An inverter control circuit has a quantizer configured to generate a switching signal which changes over switches of a main circuit converting a dc voltage into an ac voltage, and a filter circuit configured to generate a signal having specific transfer characteristic by using a signal correlated with an output voltage of an lc filter which smooths the ac voltage and an instruction signal corresponding to a target value of an output voltage of the main circuit, wherein the quantizer generates the switching signal by quantizing an output signal of the filter circuit.. .
Inverter stack
An inverter stack includes an inverter main body housing an inverter circuit inside, and a fan block disposed on the inverter main body through an engagement device and housing a plurality of fans. The engagement device includes a bolt member penetrating through a slot formed in the inverter main body, wherein a body portion of the bolt member is screwed into a nut fixed to a plate member, and having a stopper nut, and an engagement hole formed in the fan block, the engagement hole having an attachment hole portion and a clamping hole portion formed continuously.
Power conversion apparatus
An inverter circuit including a dc capacitor is connected in series to an ac power supply, and at the stage subsequent to the inverter circuit, a smoothing capacitor is connected via a converter circuit. A short-circuit period t for short-circuiting the ac terminals of the converter circuit is provided in one cycle, whereby the converter circuit is controlled, and pwm control is performed for the inverter circuit so as to improve an ac power supply power factor.
Electroluminescent pet collars, leashes and personal safety devices
Collar, harness or leash mounted electroluminescent strips are powered by an electronic inverter circuit and batteries inside a plastic housing. A lid on the housing is thinned around a central push button.
Power converter
In a power converter, vibration and noise of a motor due to pulsation of a direct current link voltage are reduced. An inverter circuit is provided, which is configured to convert a direct current link voltage having a pulsating component to an alternating current to output the alternating current to a permanent magnet synchronous motor.
Electronic ballast
The present invention discloses an electronic ballast for operating a gas discharge lamp which includes (i) a rectifier bridge circuit; (ii) a power factor correction (pfc) network that includes an electrolytic capacitor that charges by means of a circuit comprised by an inductor, diode and capacitor; and (iii) a switched inverter circuit that converts rectified dc voltage to a high frequency current ac voltage. The electronic circuit has a switch that switches on the aforementioned electronic elements making the (pfc) circuit consume energy continuously from the network, while the electrolytic capacitor remains connected to the voltage of the rectifier bridge, through the inductor and the diode, even if the inductor has no energy stored.
Buffer circuit and switching controller
A buffer circuit includes a first inverter circuit that inverts an input signal, a second inverter circuit that inverts the output signal of the first inverter circuit, an impedance element connected between the first inverter circuit and the second inverter circuit, a first conductivity type switching element that increases a potential of the output node of the second inverter circuit when the input signal exceeds a first threshold voltage, and a second conductivity type switching element that decreases a potential of the output node of the second inverter circuit when the input signal is lower than a second threshold voltage.. .
Pseudo-inverter circuit with multiple independent gate transistors
The invention relates to a a circuit including a transistor of a first type of channel in series with a transistor of a second type of channel between first and second terminals for applying a power supply potential, each of the transistors being a multiple gate transistor having at least a first (g1p, g1n) and a second (g2p, g2n) independent control gates, characterized in that at least one of the transistors is configured for operating in a depletion mode under the action of a second gate signal applied to its second control gate (g2p, g2n).. .
Inverter circuit including short circuit protected composite switch
There are disclosed herein various implementations of a short circuit protected composite switch and a circuit including such a switch. In one exemplary implementation, such a short circuit protected composite switch includes a iii-n field-effect transistor (fet) having a drain, a source, and a gate, and a high current group iv fet coupled in series with the iii-n fet and configured to limit a current through the iii-n fet.
Semiconductor system
In some aspects of the invention, multiple insulating substrates each mounting thereon at least one each of at least four semiconductor devices that form at least one of three-level electric power inverter circuits and a base plate on the one surface of which a plurality of the insulating plates are arranged are provided. On the one surface of the base plate, at least four regions are established and multiple insulating substrates are arranged to be distributed so that at least one each of the at least four semiconductor devices is arranged in each of the four regions established on the base plate.
Electrical generator
An inverter circuit comprises an inverter which can be configurable for controlling the supply of mains current from a grid to an electric machine in a start-up mode whereby the machine drives the prime mover for initialisation. Thereafter the same inverter is reconfigurable as part of the circuit to supply reactive power to the grid when the machine is running as a generator powered by the prime mover..
Motor control device
A motor controller comprising an inverter module including an inverter circuit coupled to a baseplate, wherein the baseplate includes cooling features; a cooling channel configured to receive a cooling fluid, wherein the cooling features extend into the cooling channel; a capacitor; and a laminated bus electrically coupling the capacitor to the inverter circuit and thermally coupling the capacitor to the cooling channel.. .
Portable igbt arc welding machine
A portable igbt (insulated gate bipolar transistor) of high reliability, compact size, and low cost includes a main circuit to which a control circuit and an auxiliary power supply circuit are connected. The main circuit includes, in sequence, an input rectifier filter circuit, an inverter circuit, a high-frequency primary transformer, and a secondary output rectifier circuit.
Inverter circuit
An inverter circuit 40 with reduced loss in semiconductor elements when starting up, having switching elements q1 and q2 in series, and connected to both ends of a direct current power source circuit 30 having direct current power sources psp and psn in series, and including an alternating current output terminal u connected to a connection point of the switching elements, an alternating current output terminal v connected to a connection point of the direct current power sources, a bidirectional switch element s1, connected between the alternating current output terminal u and a terminal r of an alternating current power source 1, and a bidirectional switch element s2, connected between the alternating current output terminal u and a terminal s of the alternating current power source, causing the bidirectional switch elements to turn on and off when starting up.. .
Current limiting control method for diode neutral-point-clamped three-level inverter and related circuit
The present disclosure discloses a current limiting control method for a diode neutral-point-clamped three-level inverter and a related circuit. When a current in switching tubes is lowered to a value not greater than a first preset current value, the current limiting control method for a diode neutral-point-clamped three-level inverter and the related circuit drive an inside switching tube of the switching tubes to be turned on; after a first delay time, drive another inside switching tube to be turned on; after a second delay time, control an inside switching tube to be turned off and the other inside switching tube to be normally turned on; and control all the switching tubes to be turned on or off according to a control time sequence of the diode neutral-point-clamped three-level inverter circuit..
Display apparatus
A display apparatus includes a display panel, a backlight, a pair of inverter circuit boards that are respectively arranged in vicinities of end portions in a longitudinal direction of a hack side of the display panel, and an expansion slot unit having an expansion slot, a case that includes a slit serving as an opening through which a expansion board to be inserted into the expansion slot is inserted and can guide and house the expansion hoard, and an expansion slot board, the expansion slot unit being arranged on the back side of the display panel to be adjacent to a side of one of the pair of the inverter circuit boards and the slit being provided in an open state at a position separated from the side edge of the display panel by more than a length in an insertion direction of the expansion board that is inserted.. .
Semiconductor device
Provided is a semiconductor device exemplified by an inverter circuit and a shift register circuit, which is characterized by a reduced number of transistors. The semiconductor device includes a first transistor, a second transistor, and a capacitor.
Charging control device and charging control method
A charging control device includes a chopper circuit, a primary side coil, a primary side inverter circuit, and a control unit. A charged device includes a secondary side coil, and a secondary side rectifier circuit that is configured to be connectable to a storage cell.
Contactless power supply device
In order to obtain a contactless power supply device which, even when a spatial gap between a primary winding and a secondary winding varies, is capable of not only accurately detecting whether or not the primary winding and the secondary winding come into the position opposite to each other, but also detecting how large the spatial gap between the primary winding and the secondary winding is created, the contactless power supply device is provided with a drive voltage detection unit which detects the drive voltage of an inverter circuit, a drive current detection unit which detects the drive current of the inverter circuit, and a primary component extraction unit which, from the drive voltage and the drive current, extracts a primary drive voltage and a primary drive current including the first order frequency-components having the same frequency as a drive frequency of the inverter circuit.. .
Well-biasing circuit for integrated circuit
A well-biasing circuit for an integrated circuit (ic) includes a well-bias regulator for providing well-bias voltages (n-well and p-well bias voltages) to well-bias contacts (n-well and p-well bias contacts) of each cell of the ic when the integrated circuit is in stop and standby modes. A switch is connected between a core power supply and the well-bias contact for connecting and disconnecting the core power supply and the well-bias contact when the ic is in run and stop modes, and standby mode, respectively.
System for balancing, by magnetic coupling, an association in series of elements for generating or storing electrical energy
The invention relates to a system for balancing an association in series of elements for generating and/or storing electrical energy, characterised in that it comprises: a plurality of full bridge inverters (opc1, opc2, opcn), each consisting of two inverter arms connected in parallel between two end ports of the inverter, each inverter arm, in turn, consisting of two switches (th1, tb1; th2, tb2) connected in series by a so-called median point (p11, p12) of the arm; a plurality of connectors for connecting the two end ports of each full bridge inverter to a respective element (ca1, ca2, can, pv1, pv2, pvn) of said association in series; and a magnetic coupler (nm) formed by a magnetic core on which a plurality of windings (ŵw2, wn) is formed, each winding being connected to the median points of the arms of one of said inverters. The invention also relates to an association in series of elements (ca1, ca2, can) for the electrochemical storage of electrical energy, provided with such a balancing system.
Alarm 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.
Switch 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.
Uninterruptible 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..
Welding-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.
Distributed voltage source inverters
Systems and methods are disclosed with multiple direct current (dc) voltage source inverters to supply power to an alternating current (ac) power system. The system includes a plurality of full bridge inverter stages, each having a primary node and a secondary node, each of said full bridge inverter stages having positive and negative node, each of said full bridge inverter stages having a voltage supporting device electrically connected in a parallel relationship between said positive node and said negative node and a direct current (dc) source connected between the positive and negative nodes; at least one stacked inverter phase, each stacked inverter phase having a plurality of said full bridge inverter stages, each of said full bridge inverter stages in each stacked inverter phase interconnected in a series relationship with said secondary node of one of said full bridge inverter stages connected to said primary node of another full bridge inverter, said series interconnection defining a first full bridge inverter stage and a last full bridge inverter stage, each phase having an input node at said primary node of said first full bridge inverter stage and an output node at said secondary node of said last full bridge inverter stage; a local controller coupled to each full bridge inverter stage providing the control signals to each full bridge inverter stage to output an approximate nearly sinusoidal voltage waveform; and a system controller which communicating with each local controller; the system controller generating system control signals for configuration, synchronization, activation, deactivation and operating mode selection of said local controller..
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.
Bypass control bidirectional wireless charging device
A bypass control bidirectional wireless charging device provides bidirectional charging mode, in which includes a logic control unit electrically connected to a wireless transmission unit, a full-bridge inverter, a buck-boost unit, a discharging switch unit, a back current prevention unit and a selective switch unit. While the wireless discharging mode started, the discharging switch unit turned on and the battery provided the transmitting power.
Bypass control wireless charging device
A bypass control wireless charging device includes a logic control unit electrically connected to a wireless transmission unit, a full-bridge inverter, a buck-boost unit, a discharging switch unit and a back current prevention unit, wherein the discharging switch unit electrically connected to a battery, and a inlet terminal of the back current prevention unit electrically connected to a charging terminal, when the charging terminal electrically connected to an external power, the back current prevention unit turned on by the logic control unit to turned off the discharging switch unit and the input voltage of the external power boosted by buck-boost unit and converted dc to ac by the full-bridge inverter. The coil of the wireless transmission unit provided the emission electricity with ac induction to achieve the purpose of wireless charging for the electronics while received the emission electricity of the wireless transmission unit..
Mold 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..
Apparatus 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.
Electronic 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.
Vehicle 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).
Reactive 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..
Wireless power transmitter having low noise and high efficiency, and related methods
A wireless power transmitter comprises a bridge inverter including a first switch and a second switch coupled together with a first switching node therebetween, and a first capacitor coupled to the first switching node. The transmitter further includes control logic configured to control the first switch and the second switch according to an operating frequency to generate an ac power signal from a dc power signal, and a resonant tank operably coupled to the first switching node of the bridge inverter, the resonant tank configured to receive the ac power signal and generate an electromagnetic field responsive thereto.
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.
Systems and methods for efficient provision of arc welding power source
Methods and systems for creating and controlling an ac output for welding, plasma cutting or heating are provided. One embodiment of the present disclosure achieves a desired square wave ac output and reduces the number of circuit components needed by combining components of a buck converter and a full bridge inverter.
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..
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.
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..
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.
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.
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.
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.
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.
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).
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..
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.. .
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.
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.. .
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.
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.
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.
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.. .

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