Class 363/10 - By semiconductor device converter

Subclass of Class 363 - Electric power conversion systems
Definition: Subject matter wherein the converter means includes a semiconductor
No. of patents: 37
Last issue date: 05/08/2012

Number	Title	Issue Date
8174849	Electric power converter with soft switching for two way power conversion An electric power converter facilitates performing soft switching in the two-way electric-power-conversion operation thereof, and reducing the manufacturing costs thereof and the losses caused therein, The electric power converter includes a first switching device; ...	05/08/2012
7460377	Matrix converter A matrix converter for converting a polyphase alternating current into a desired alternating output current includes at least two stages; a plurality of controllable bidirectional switches, converts m phases of the polyphase alternating current into alternating outp...	12/02/2008
7317998	Method for the calculation and the assessment of the frequency spectrum of a matrix converter A method for the calculation of an output spectrum of a matrix converter in which m phases of a generator as an input are alternatingly connected via a multiple number of controllable bi-directional switches arranged in an (m×n) matrix with n (n	01/08/2008
7173834	Half-controlled silicon-controlled rectifying system and method thereof A half-controlled silicon control rectifying system and method thereof are provided. In this case, the first detection unit detects the zero cross phase of the triphase AC in input port thereof. The second detection unit detects the voltage of the DC bus. Then the c...	02/06/2007
7034263	Apparatus and method for inductive heating A system and method for inductive heating, in which a power source provides current pulses with high-frequency harmonics to a heater coil, the coil generating a magnetic flux for inductive heating of an article. The high-frequency harmonics enhance a relative propor...	04/25/2006
7030593	Multiple path variable speed constant frequency device having automatic power path selection capability The present invention relates to variable speed constant frequency (VSCF) devices and methods for maximizing engine generator efficiency. In one embodiment, a VSCF device may include at least two paths for conducting power to the load. One path, a line inductor path...	04/18/2006
6943535	Multiple-phase DC-DC converter topology A multiple-phase DC—DC converter adds at least one additional phase to an N-phase DC—DC converter to improve the converter's response to changes in load. In one embodiment, an additional phase operates at a switching frequency greater than that of the N phases, ...	09/13/2005
5969966	Power converting apparatus and method using a multiple three-phase PWM cycloconverter system A power converting apparatus and a power converting method for driving a high voltage AC motor at a variable speed. Conventional invertor systems cannot solve technical subjects such as energy conservation, resource conservation, miniaturization, efficien...	10/19/1999
5943221	Portable power unit A portable power unit is provided. A desired waveform signal indicative of a desired waveform having a desired frequency is generated. Switching control of a variable control bridge circuit is performed based on the desired waveform signal to cause the va...	08/24/1999
5274538	Power conversion apparatus A power conversion apparatus comprises an inverter circuit for converting DC power into AC power which has a first frequency; a transformer connected to the inverter circuit. A cyclo converter circuit having a bidirectional switch controls a direction in ...	12/28/1993
5214366	Three-phase converter for polyphase induction motors A three-phase converter for polyphase induction motors has an input transformer with primary windings and at least two secondary windings associated with each primary winding, and controlled power semiconductors. Groups of power semiconductors are connect...	05/25/1993
4814967	Digitally-controlled cycloconverter A digitally-controlled cycloconverter converts a multiple-phase power signal of variable frequency into a single-phase or multiple-phase signal of a lower selected frequency. The cosinusoidal algorithm is utilized to determine the firing delay times, with...	03/21/1989
4760321	AC motor drive apparatus An AC motor drive apparatus of this invention is constituted by an AC power source, a first circulating current type cycloconverter having an output terminal coupled to the AC power source, a phase-advanced capacitor coupled to an input terminal of the fi...	07/26/1988
4750098	Unrestricted frequency changer with current source output Three terminal, six and twelve pulse unrestricted frequency changing circuits are provided by inserting controllable bidirectional switching circuits between open star configured coils in multiple phase windings of isolation transformers. Where the switch...	06/07/1988
4736148	AC motor control method and its control apparatus A self-extinguishing element such as a gate turn-off thyristor (GTO) is used for each arm of the inverter. A capacitive load is connected to the output terminal of the inverter. In a region where the output frequency of the inverter is low, the self-extin...	04/05/1988
4713744	Fractional frequency converter using zero switching of input frequency halfwaves A frequency converter is provided for a three-phase electric motor and has input connections for a multi-phase alternating current electric supply source, and output connections for connection to a three-phase electric motor. A SCR bridge including a plur...	12/15/1987
4697230	AC power supplied static switching apparatus having energy recovery capability A three-phase matrix converter including switches having snubber circuits associated thereto, is provided with a common voltage clamp capacitor for limiting the voltage applied to the snubber capacitor, and energy is accumulated in the clamp capacitor whi...	09/29/1987
4680686	Electric 3-phase supply device for an ozonizer A supply device connected to a 3-phase mains supply for an ozonizer comprising at least two capacitive discharge elements (7, 8). The device comprises two single-phase step-up voltage transformers (1, 2) having air gaps (5, 6) connected in a Scott circuit...	07/14/1987
4673823	Apparatus for operating cycloconverters in parallel fashion Power is fed to a plurality of loads by a respective plurality of circulating current type cycloconverters connected to an ac power supply. A power compensating capacitor common to the cycloconverters is provided at the ac power receiving-end to deliver a...	06/16/1987
4670826	Control method for cycloconverter and control apparatus therefor A control system for a cycloconverter of the circulating current type produces an ac current of a variable frequency. The cycloconverter is configured to connect a power factor compensating capacitor at its receiving-end, thus to control a lagging reactiv...	06/02/1987
4628425	Method and apparatus for the conversion of a polyphase voltage system A three phase voltage system, balanced and sinusoidal, is converted into another one, having the same properties, but with amplitude, frequency and phase changed, by means of sequential sampling of all input phases. The desired output system is synthetize...	12/09/1986
4538220	Adjustable frequency AC motor drive using an unrestricted frequency changer system In an unrestricted frequency changer (UFC) the control pulses are generated by the intersection of a reference ramp of controllable slope and frequency with a succession of timing ramps characterizing the succession of phase voltages at the input of the U...	08/27/1985
4495557	Switching controller directly operable from AC A high response motor controller is disclosed which operates directly from a multi-phase AC power line without a DC link. The controller directly converts power from a fixed frequency multi-phase input to a D.C. or variable frequency output current. The o...	01/22/1985
4439823	Converting multiphase power from one frequency to another using current waveforms a multiphase AC current of one frequency is converted to a multiphase current of another frequency by a frequency changer having its output terminals terminated by a load having the impedance characteristics of a voltage source. In this arrangement the mu...	03/27/1984
4418380	Method and apparatus for controlling the circulating current of a cycloconverter A circulating current of a cycloconverter in each phase is distributed and controlled in such a way that a circulating current in a phase having a large absolute value of a load current is small, and the circulating current of a phase having a small absol...	11/29/1983
4314321	Ozonizer feeding device An ozonizer power feeding device comprising a multiphase power source having at least one terminal for each phase, a thyristor circuit coupled to the terminals of the power source and including at least two thyristors for each phase connected at one side ...	02/02/1982
4303972	Controlling the circulating current in naturally commutated static power converters The firing pulses to the nonload carrying bank only of the naturally commutated thyristor power circuit of a static power converter are retarded to reduce or eliminate the interbank circulating current. In one form of the invention, half wave rectified lo...	12/01/1981
4300077	Trans-synchronous motor apparatus and method This disclosure is concerned with a motor technique for generating speeds that are fractions of synchronous speeds, through novel time-staggered selected half-cycle energization of a plurality of magnetic poles by a controlled switching sequence, generati...	11/10/1981
4281371	Cycloconverter with waveform improving nonlinear feedback The quality of the output waveform of a cycloconverter is greatly improved by a feedback loop that compensates for the inherent nonlinearity of the converter forward gain. A feedback signal, preferably proportional to the current through the shunt capacit...	07/28/1981
4267498	Drive equipment with two-phase synchronous motor A motor drive apparatus includes a two-phase synchronous motor having two power windings. The motor is supplied with power from an alternating voltage network through a direct convertor. The converter has two controllable converter bridges that are suppli...	05/12/1981
4039783	Solid state step transmitter The Solid State Step Transmitter converts a low level asymmetrical squareve voltage into a high level three-phase asymmetrical square-wave voltage, which is completely isolated from the input voltage and is one twenty-fourth of the input frequency. The o...	08/02/1977
4013937	Naturally commutated cycloconverter with controlled input displacement power factor A naturally commutated cycloconverter having at the input a source of higher frequency than at its output is used as a static reactive power generator to correct displacement angle in an alternating current power system when coupled thereto at the output....	03/22/1977
3999112	Polyphase frequency converter The interphase reactors of an unrestricted static frequency changer are mounted on a common multilegged magnetic core without affecting the individual quality of each reactor in the operation of the frequency changer....	12/21/1976
3991354	Variable speed drive for induction motor A variable speed drive is provided for a polyphase induction motor. The motor is connected through a contactor to a constant frequency polyphase alternating current power source for starting and for full speed operation but is supplied by a variable frequ...	11/09/1976
3989996	Force commutation static frequency changer apparatus using direct capacitor commutation An improved force commutated cycloconverter is provided by alternatively switching a capacitor to different groups of main thyristors including a thyristor to be commutated in the controlled sequence of thyristor conductions. The capacitor swing back to a...	11/02/1976
3959709	Multi-phase power supplies Apparatus for converting a single-phase power supply to multi-phase operation in which at least one phase of the multi-phase supply is generated by applying the single-phase to the input of a bridge network, each arm of which contains at least one switch ...	05/25/1976
3931563	Force commutation static frequency changer apparatus using direct current chopper technique An improved force commutated cycloconverter is provided by selectively switching a DC chopper to different groups of main thyristors including a thyristor to be commutated in the controlled sequence of thyristor commutations. The DC chopper is self-commut...	01/06/1976

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Class 363/10 - By semiconductor device converter