|| List of recent Inverter Circuit-related patents
| 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.
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.
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.
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..
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.. .
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.
|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.
|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.
|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..
|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.
|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..
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..
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.
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.. .
|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..
|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.
|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.. .
|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.