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5684683 DC-to-DC power conversion with high current output  
A DC-to-DC converter for high current outputs is provided having an input side circuit, including two converter bridges, and an output side circuit, including two diode rectifier configurations....
5684688 Soft switching three-level inverter  
A three-level NPC inverter topology including two auxiliary resonant commutation circuits which are controlled to clamp the voltage across each main inverter switch to zero voltage prior to...
5680302 AC output control apparatus  
An inverter for DC/AC conversion includes an inverter bridge controlled by a PWM controller. The inverter has a first control loop for performing PWM control in accordance with the difference...
5680301 Series/parallel resonant converter  
A series/parallel resonant converter includes a resonant control circuit 1 that outputs a pair of alternately high gate drive signals G1, G2 ; switches in the form of isolated gate bipolar...
5677833 Power conditioning system for a four quadrant photovoltaic array with an inverter for each array quadrant  
A photovoltaic (PV) power system having distributed square wave current DC to AC inverters integral with strings of PV cells in a PV array. The PV array is arranged into four quadrants and...
5673188 Zero voltage switching series resonant half bridge VHF inverter  
A DC to AC inverter that includes a first capacitor (11) and a first inductor (13) connected in series between a positive voltage supply node and a central node; a first active switch switching...
5671130 Method and apparatus for controlling voltage reflections using a motor controller  
A method and apparatus for eliminating greater than twice over voltage by altering firing signals provided to a PWM inverter. The signals are altered by either limiting their maximum and minimum...
5671134 Inverter unit and inverter apparatus  
An inverter unit of the invention converts a DC current to a high frequency AC current. The inverter unit is formed of a metal conductor base plate connected to a positive terminal of a DC power...
5666281 Battery polarity switch for applying power to a co-axial cable and incorporating regulation  
A switching circuit is provided to process a DC voltage and apply a low frequency AC voltage, having a trapezoidal waveform, to a co-axial cable transmitting the low frequency AC voltage to a load...
5663627 Control apparatus for controlling motor of air conditioner  
A control apparatus for controlling a motor of an air conditioner includes a converter, having switching for improving an input power factor, for converting an AC power to a DC power and an...
5657214 Stepped waveform PWM inverter  
An inverter for converting DC power into AC power includes first and second subinverters having a plurality of controllable switches and three-phase outputs coupled to a summing transformer having...
5657220 Electrical power inverter  
An electrical power inverter with a controllable output voltage waveform is disclosed. In a preferred embodiment, the electrical power inverter has a trapezoidal output voltage waveform with rising...
5657219 Opposed current power converter  
A power converter includes a pair of switches, each of the switches being connected between positive and negative constant DC voltage sources and a common output node which is connected to a load....
5657212 Capacitor coupled converter  
The capacitor coupled converter (CCC) is a DC-DC converter which produce a DC source as the output. It has two input terminals for connection to a DC voltage source, two output terminals for...
5654880 Single-stage AC-to-DC full-bridge converter with magnetic amplifiers for input current shaping independent of output voltage regulation  
An ac-to-dc switching full-bridge converter employing voltage bidirectional switches as controllable series input switches, preferably implemented with magnetic amplifiers, that couple ac...
5652701 Inverter operation command apparatus  
An inverter operation command apparatus having increase and decrease keys which, when operated according to predetermined requirements, allows the frequency to be set quickly, requires only the...
5650925 Diode clamping arrangement for use in electronic ballasts  
An electronic ballast includes a low cost circuit for power factor correction. A PWM circuit utilizes a wave form signal derived from the ballast inverter as a reference. The reference wave form...
5648896 Inverter device using capacitance for controlling waveform slew during voltage polarity transitions  
A DC voltage polarity switching circuit includes four switches connected in a bridge configuration. Switches in opposing legs are paired with each other and turned on and off in alternate phases to...
5648705 Motor vehicle alternator and methods of operation  
A conventional full wave diode bridge of an alternator is replaced with a full wave controlled rectifier bridge having controlled switches in place of diodes. Phase control is performed by the...
5646835 Series resonant converter  
A series resonant circuit (SRC) which includes, in one embodiment, an inverter having four (4) IGBTs is described. The SRC also includes a series coupled inductor and capacitor, a transformer, and...
5644484 Bidirectional load current sense circuit for a H-bridge  
The present invention relates to a current sense device for a load arranged in a diagonal of a H-bridge comprising MOS transistors (M1, M2, M3, M4) and operating in class AB, characterized in that...
5644483 Voltage balanced multilevel voltage source converter system  
A voltage balanced multilevel converter for high power AC applications such as adjustable speed motor drives and back-to-back DC intertie of adjacent power systems. This converter provides a...
5642268 Power supply for a magnetron having controlled output power and narrow bandwidth  
A power supply for a magnetron generating a DC output having a low voltage ripple content at the power supply output for energizing the magnetron. The power supply includes a voltage and current...
5642273 Resonant snubber inverter  
A resonant, snubber-based, soft switching, inverter circuit achieves lossless switching during dc-to-ac power conversion and power conditioning with minimum component count and size. Current is...
5638266 Free wheel diode arrangement for neutral point clamped electric power conversion apparatus  
The invention is directed to a neutral point clamped electric power conversion apparatus having four semiconductor switching elements connected in series. The capacity of outer free wheel diodes...
5638260 Parallel resonant capacitor charging power supply operating above the resonant frequency  
A power supply for supplying a load capacitor and comprising a parallel resonant circuit having an inductor and a capacitor, a switching network operating at a frequency at or above the resonant...
5633791 Double modulation converter  
The double modulation converter (DMC) is a DC-AC converter for driving an AC-DC converter. It has two input terminals for connection to a DC voltage source, two output terminals for connection to...
5633793 Soft switched three-phase boost rectifiers and voltage source inverters  
A boost rectifier is provided with an ultra high speed diode in its direct current rail to reduce diode reverse recovery loss with or without implementing a soft switching technique. Full...
5631819 Power converter  
The invention provides an electric power converter system which uses a standard low-priced control processor and is suitable for improving the voltage utilization factor in the output voltage....
5631811 Auxiliary power supply device  
Disclosed is an auxiliary power supply device generating a constant auxiliary power. The auxiliary power supply device comprises a main power supply wherein alternating current is applied to a...
5627758 Vector control board for an electric vehicle propulsion system motor controller  
A vector control board for an electric vehicle propulsion system motor controller comprising a microcontroller for generating torque requests, a digital signal processor for receiving the torque...
5627743 Chopper power supply adapted to enable low-voltage switching to be performed  
A chopper power supply of the invention includes a bridge arm constituted by two switching sections in series and receiving a DC voltage. Each switching section includes switching means in parallel...
5625539 Method and apparatus for controlling a DC to AC inverter system by a plurality of pulse-width modulated pulse trains  
A pulse train pulse-width modulated by PWM control using a sine-wave signal and a carrier signal is inverted alternately in positive-negative polarity. With a high-frequency AC signal obtained by...
5625549 Boost-buck rectifier bridge circuit topology with diode decoupled boost stage  
A boost-buck rectifier bridge circuit topology having two diode decoupled boost stages is formed as an H-shaped bridge with the alternating voltage source comprising the center leg and the first...
5625542 Low-noise operation of a machine fed by a pulse inverter  
A method and apparatus for the low noise operation of a electrical machine driven by a pulse inverter computes the amplitudes and frequencies of the harmonics of the inverter output voltages....
5625550 Apparatus used with AC motors for compensating for turn on delay errors  
A method and apparatus for compensating for deviations in the alternating voltage produced by a PWM inverter. The necessary sequence in which inverter components must be triggered results in...
5623399 Inverter apparatus having capacitors mounted proximal to associated switching circuits  
An inverter device for changing direct current to alternating current for supplying to an electric motor which may be employed in an electric automobile. This inverter device includes a plurality...
5617308 Noise-immune, clamped, resonant link inverter  
A resonant link inverter control for driving a multi-phase induction motor through three feed lines each connected to opposite sides of a DC bus by a pair of switches. A resonant tank circuit...
5617306 One cycle control of bipolar switching power amplifiers  
A one cycle control for controlling DC-to-AC switching converters is achieved by forcing the average of a controlled switched variable to be exactly equal to the control reference in each switching...
5615102 Inverter apparatus and method of operation therefor  
An inverter apparatus for driving a three-phase AC motor, having first and second arms each comprising plural parallel-connected transistors and plural parallel-connected diodes, is protected...
5608616 Power converter  
A power converter for an AC generator for motor vehicles for converting a generated voltage of the AC generator driven by an engine into a DC voltage to feed to a battery includes at least either...
5604674 Driving circuit module  
To suppress the increase of the cost and dimensions of an intelligent module which incorporates a control function with the driving circuit device having a bridge circuit for driving inverters etc....
5598326 High frequency AC/AC converter with PF correction  
A high frequency AC/AC converter apparatus with power factor correction includes an AC/DC converter circuit part to provide power factor correction and a DC/AC inverter circuit part to produce a...
5598325 Series coupled non-isolated bipolar transformer within automotive power amplifier  
A bipolar output transformer for use in a automobile audio amplifier. The transformer includes series connected primary and secondary windings and a diode bridge which together step up an input...
5594634 DC link inverter having soft-switched auxiliary devices  
A DC Link for use with a multi-phase DC to AC converter provides soft-switch opportunities to the main inverter devices only when such opportunities are required. A quasi-resonant rail swings from...
5594635 Constant frequency, zero-voltage-switching converters with resonant switching bridge  
A novel, compact, converter structure utilizes a switching bridge configuration to provide a low voltage stress, constant frequency controlled converter whose switches and diodes all turn-on and...
5592371 DC link inverter  
A DC Link for use with a multi-phase DC to AC converter provides soft-switch opportunities to the main inverter devices only when such opportunities are required. A quasi-resonant rail swings from...
5585708 Four quadrant motor controller minimizing distortion index  
A motor control apparatus and method is disclosed for controlling a multiphase AC motor by controlling electrical quantities such as voltage or current applied to the stator of the motor. The...
5579217 Laminated bus assembly and coupling apparatus for a high power electrical switching converter  
A laminated bus assembly including a high power coupler to provide a low impedance, low noise laminated bus assembly for a switched converter that includes a plurality of switch pairs to convert...
5576943 Soft switched three phase inverter with staggered resonant recovery system  
A resonant recovery circuit operates to discharge switching energy losses stored in a snubber capacitor associated with each pole of an inverter to return the discharged current to the DC supply by...