| Patent Number |
Title Of Patent |
Date Issued |
| 7400061 |
Soft switched secondary side post regulator for DC to DC converter |
July 15, 2008 |
| A high frequency, full bridge, resonant DC to DC converter provides a main DC output voltage that is regulated by adjusting the phase shift of the input power to a main input transformer and at least one additional DC output voltage that is regulated on the secondary side of the power in |
| 6031747 |
Interleaved synchronous flyback converter with high efficiency over a wide operating load range |
February 29, 2000 |
| The present invention provides a switching power supply which operates at a high efficiency over a wide operating load range. When the output power is below a first power level, the first power converter stage operates in a hard-switching mode and the second power converter stage is off. |
| 5608771 |
Contactless power transfer system for a rotational load |
March 4, 1997 |
| Power is transferred from a stationary power supply to a rotational gantry in a computer tomography (CT) system through a rotary transformer arranged in a ring configuration with an inner diameter that is sufficiently large to receive a patient. The rotary transformer has a toroidal roto |
| 5594629 |
High-frequency switching circuits operable in a natural zero-voltage switching mode |
January 14, 1997 |
| A dc-to-dc power converter, comprising a transformer, a single primary-side power switching device and a parallel combination of a diode and a capacitance, is controlled to operate in a "natural" zero-voltage switching mode such that the power switching device is switched with zero-v |
| 5576940 |
Front-end power converter for distributed power systems |
November 19, 1996 |
| A front end converter for interfacing prime power to a lower voltage distribution bus, e.g., Vdc, in a distributed power system has a natural droop characteristic which emulates a series resistor, but without associated losses. With this droop characteristic, converters are parallele |
| 5570074 |
Very low leakage inductance, single-laminate transformer |
October 29, 1996 |
| A transformer having a very low, predetermined leakage inductance includes an elongate dielectric laminate having two surfaces. A primary winding having a pattern conformal to the configuration of the laminate is disposed on one surface and extends substantially the length of the lam |
| 5568368 |
Square-wave converters with soft voltage transitions for ac power distribution systems |
October 22, 1996 |
| A converter for an ac power distribution system provides a square-wave voltage of low output impedance to an ac power distribution bus for driving a plurality of loads, each load including a rectifier and an input filter capacitor. Slew-rate limiting capacitors are employed to limit the |
| 5546294 |
Resonant converter with wide load range |
August 13, 1996 |
| Low-power auxiliary circuitry is added to a resonant converter for providing high efficiency operation, low EMI, and tight output voltage control over a wide load range. There is an auxiliary circuit corresponding to each half-bridge connection of main switching devices, each auxilia |
| 5514921 |
Lossless gate drivers for high-frequency PWM switching cells |
May 7, 1996 |
| A gate driver circuit, including either a full-bridge or a half-bridge configuration of gate drive switching devices, is capable of applying gate drive signals of variable pulse widths in a substantially loss,less manner to power switching devices of a high-frequency resonant switching |
| 5481449 |
Efficient, high power density, high power factor converter for very low dc voltage applications |
January 2, 1996 |
| A high efficiency, high power factor, low voltage power converter includes a dual active bridge converter (DABC) having transformer-coupled primary-side and secondary-side bridge connections of switching devices and providing two output voltages. One output voltage drives a resonant |
| 5451962 |
Boost regulated capacitor multiplier for pulse load |
September 19, 1995 |
| A capacitance multiplier/regulator (FIG. 1) stores charge at high voltage across a capacitor (22,32), and capacitance-multiplies current to a load (100) by step-down transformers (26,36), controlled switches (24,34), and rectifiers (28,38). The switch pairs (24a,24b;34a,34b) each switch |
| 5414238 |
Resonant power supply for an arcjet thruster |
May 9, 1995 |
| A power supply for a thruster for space applications (e.g., an arcjet thruster) comprises a series/parallel resonant converter wherein the load quality (Q) factor of the resonant tank circuit inherently varies with arc voltage so as to accommodate changes in arc voltage from initiation |
| 5377090 |
Pulsed power converter with multiple output voltages |
December 27, 1994 |
| A distributed power system for providing multiple output voltages, including pulsed voltages, to a solid-state phased-array radar transmit/receive module, for example, includes: an energy-storage capacitor for coupling to an input dc power source and for storing substantial energy at |
| 5359180 |
Power supply system for arcjet thrusters |
October 25, 1994 |
| A power supply system for thrusters (e.g., arcjet thrusters) in a spacecraft system comprises lightweight, redundant power supplies that share the power distribution function to the thrusters. Each power supply comprises a plurality of parallel-connected power supply subunits of which |
| 5352861 |
Resonant high-voltage pulser for arcjet thruster ignition |
October 4, 1994 |
| A starting circuit for providing a high-voltage pulse for igniting an arc in an arcjet thruster includes a resonant capacitor for storage of the energy required to generate the high-voltage pulse. The capacitor is resonantly switched with a small resonant inductor which, in turn, res |
| 5302862 |
Efficient transformer-coupled gate driver circuit for power FET's |
April 12, 1994 |
| A gate driver circuit for a converter which requires an approximately 50% duty cycle to drive two power switching devices (e.g., in many interleaved, push-pull and bridge converters) includes a single transformer secondary winding coupled between the gates of the two devices. The tra |
| 5283727 |
Independent control of the AC line current and output DC voltage of a high power factor AC-to-DC |
February 1, 1994 |
| A method and system for controlling a dual output power converter of the type having a pair of input terminals connectable to a source of rectified AC power of variable voltage amplitude, a boosting circuit including a secondary winding of a boost transformer operatively coupled in circu |
| 5274539 |
Capacitance-multiplying converters for supplying distributed pulsed loads |
December 28, 1993 |
| A distributed power system for supplying pulsed loads, such as radar loads, includes a relatively high-voltage, energy-storage capacitor coupled in parallel between an input dc power source and a capacitance-multiplying converter. The pulse energy is stored in the energy-storage capacito |
| 5179512 |
Gate drive for synchronous rectifiers in resonant converters |
January 12, 1993 |
| A resonant converter, including a transformer for separating a high-voltage (primary) side from a relatively low-voltage (secondary) side, has at least one synchronous rectifier and an auxiliary sense winding coupled to the gate thereof. The input capacitances of the synchronous rectifie |
| 5119283 |
High power factor, voltage-doubler rectifier |
June 2, 1992 |
| A voltage-doubler rectifier includes an ac fullbridge diode rectifier and a dc-to-dc converter having two output boost circuits. One of the output boost circuits is coupled between the rectifier and a dc link, and the other output boost circuit is coupled, with opposite polarity, between |
| 5113337 |
High power factor power supply |
May 12, 1992 |
| An off-line switching power supply includes an ac rectifier and a dual-output switching converter having one output coupled between the ac rectifier and the input to the dual-output converter in order to provide a high power factor, the other output of the dual-output switching converter |
| 5073848 |
Power distribution system |
December 17, 1991 |
| A power distribution system for supplying power to a plurality of point-to-load power supplies includes a plurality of bulk power supplies, each having a separate respective power distribution bus coupled at the output thereof. Each power distribution bus is coupled to each point-of- |
| 5060130 |
High-efficiency, high-density, power supply including an input boost power supply |
October 22, 1991 |
| A power supply includes a dc-to-dc converter with an integral boost power supply for maintaining the effective converter input voltage within a predetermined steady-state range, even if the input voltage to the power supply exhibits substantial voltage transients. In one preferred em |
| 5038264 |
Multiple-output, single-ended, resonant power converter |
August 6, 1991 |
| A single-ended, resonant power converter includes an input filter having at least one primary winding and multiple auxiliary, or secondary, windings. A regulated input DC voltage is transformed directly to the auxiliary windings. The voltages across the auxiliary windings are respectivel |
| 5010261 |
Lossless gate driver circuit for a high frequency converter |
April 23, 1991 |
| A high efficiency gate driver circuit for driving a power switching device of a high frequency converter includes a series resonant circuit for making resonant transfers of energy between the input capacitance of the power switching device and a storage capacitor to achieve substantially |
| 4967109 |
High efficiency gate driver circuit for a high frequency converter |
October 30, 1990 |
| A high efficiency gate driver circuit for driving a power switching device of a high frequency power converter utilizes a series resonant circuit to reduce or substantially eliminate turn-on switching losses. The resonant circuit comprises the input capacitance of the power switching dev |
| 4912622 |
Gate driver for a full-bridge lossless switching device |
March 27, 1990 |
| A control circuit for a full bridge switching converter including power FET switching devices. The control circuit including a gate driver with a voltage sensor circuit which senses the precise instant to gate the power FET on in order to achieve substantially lossless switching by the |
| 4903189 |
Low noise, high frequency synchronous rectifier |
February 20, 1990 |
| A synchronous rectifier is able to operate at higher frequencies and provides an output having lower noise than prior art FET synchronous rectifier system by using field effect switching devices which contain only one conductivity type of semiconductor material and connecting a high |
| 4876635 |
Series resonant inverter with lossless snubber-resetting components |
October 24, 1989 |
| A circuit for "resetting" snubbers in a series resonant bridge inverter maintains lossless snubber action during light-load and no-load inverter operation and during operation near resonance. Series resonant circuit operation is controlled to be above the resonant frequency to ensure |
| 4864479 |
Full-bridge lossless switching converter |
September 5, 1989 |
| A full bridge integrable dc-to-dc converter is described which includes four FET switching devices wherein the parasitic capacitors of the switching devices exchange energy with the leakage and magnetizing inductances of the converter transformer. Since energy is exchanged between th |
| 4845605 |
High-frequency DC-DC power converter with zero-voltage switching of single primary-side power de |
July 4, 1989 |
| A high-frequency DC-DC Converter uses a single, primary-side power switching transistor and all of the circuit parasitic elements to achieve high efficiency and small size while operating from no-load to full-load with a relatively narrow operating frequency variation of only about 1 |
| 4825348 |
Resonant power converter with current sharing among multiple transformers |
April 25, 1989 |
| A resonant power converter has a plurality of transformers, each having a primary winding and a secondary winding coupled thereto; the primary windings of all of the plurality of transformers are connected in series. The plurality of transformer secondary circuits are effectively connect |
| 4796173 |
Low input voltage resonant power converter with high-voltage A.C. link |
January 3, 1989 |
| A high-frequency resonant power converter transforms a relatively low D.C. input voltage to a relatively high A.C. link voltage to drive a resonant circuit. The high A.C. voltage appearing across a resonance circuit high-voltage capacitor is then transformed down to a relatively low valu |
| 4758940 |
Control circuit for insuring super-resonant operation of resonant converter |
July 19, 1988 |
| A control circuit for insuring super-resonant operation of a DC-to-AC resonant converter, having a resonance circuit with a resonant frequency F.sub.r, in which a circulating current i.sub.r flows between a first node A, alternatingly connected between an input potential and a primary co |
| 4733104 |
Integrated circuit for controlling power converter by frequency modulation and pulse width modul |
March 22, 1988 |
| An integrated circuit contains the gate drivers and the control components for constructing a DC power supply in any of the most popular converter topologies. Multi-function elements in the control circuit minimize the area of the chip. The integrated circuit drives both the upper and lo |
| 4695934 |
Multiple output resonant power supply |
September 22, 1987 |
| A resonant converter feeds five load circuits while maintaining excellent voltage regulation. The power converter features a non-bifilar wound transformer with the resonant capacitors serving the dual function of suppressing diode voltage switching transients while forming the resonant |
| 4694384 |
HVIC power supply controller with primary-side edge detector |
September 15, 1987 |
| A digital data detector is part of the primary side control electronics in a high voltage integrated circuit for regulating a power supply secondary side output potential; the detector output is responsive to the transitions of digital error data received from the supply secondary side |
| 4685040 |
Integrated circuit for controlling power converter by frequency modulation and pulse width modul |
August 4, 1987 |
| An integrated circuit contains the gate drivers and the control components for constructing a DC power supply in any of the most popular converter topologies. Multi-function elements in the control circuit minimize the area of the chip. The integrated circuit drives both the upper and lo |
| 4684867 |
Regenerative unipolar converter for switched reluctance motors using one main switching device p |
August 4, 1987 |
| In a converter for a switched reluctance motor, a dump capacitor receives freewheeling current from each phase and resupplies the charge to the dc supply. In this manner, residual magnetic energy is recovered and phase current quickly reduced while the converter requires only one main |
| 4672528 |
Resonant inverter with improved control |
June 9, 1987 |
| A resonant inverter is operated in a manner to provide a substantially constant output voltage to a load. The inverter is controlled using either a frequency control mode or a phase shift control mode. In the frequency control mode, a constant output voltage is maintained through frequen |
| 4642745 |
Power circuit with high input power factor and a regulated output |
February 10, 1987 |
| A single power converter is capable of drawing low distortion current from an AC line and delivering DC or AC power to a load. The single power converter is used to independently control the input current and the output current. The power converter transformer has an output winding w |
| 4628426 |
Dual output DC-DC converter with independently controllable output voltages |
December 9, 1986 |
| A single DC power switching converter feeds two DC load circuits from two transformer secondary windings. One winding is tightly coupled to the primary and its output voltage is controlled using pulse-width modulation. The other secondary winding is loosely coupled to the primary so that |
| 4581542 |
Driver circuits for emitter switch gate turn-off SCR devices |
April 8, 1986 |
| A bipolar emitter switching transistor in an emitter switched gate turn-off thyristor (GTO) arrangement has a controllable switching device coupled between the base of the emitter switching transistor and the anode of the GTO so that base current needed for the bipolar emitter switching |
| 4541041 |
Full load to no-load control for a voltage fed resonant inverter |
September 10, 1985 |
| A control for a voltage fed series resonant inverter includes controllable switch means which supplies square wave voltage signals to a resonant series circuit. The output of the inverter is coupled to a rectifier to provide dc power to a load. The control comprises summer means for |
| 4504895 |
Regulated dc-dc converter using a resonating transformer |
March 12, 1985 |
| A resonant dc-dc converter employing power transistors as the switching elements generates a high dc output voltage (150 kilovolts) to drive an X-ray tube. The converter is configured such that the resonating circuit elements can be realized using the transformer parasitic elements. Volt |
| 4477868 |
High frequency series resonant dc-dc converter |
October 16, 1984 |
| A dc-dc converter employs a series resonant circuit which is driven by square waves of current. By adjusting the frequency of the square waves of current above the resonant point or by holding the frequency constant and varying the current supplied to the converter, the voltage on the re |
| 4460949 |
High frequency parallel resonant dc-dc converter |
July 17, 1984 |
| A dc-dc converter employs a parallel resonant circuit which is driven by square waves of current. By adjusting the frequency below the resonant point, the voltage on the resonant components can be stepped up. Switching losses in the inverter devices are low since the inverter feeds a lag |
| 4456839 |
High gain latching Darlington transistor |
June 26, 1984 |
| A high gain latching Darlington transistor comprises a gate turn-off thyristor and a load transistor coupled in Darlington configuration. Circuit means including a diode are coupled to the gate turn-off thyristor and the transistor to provide a low loss path for load transistor current |
| 4445049 |
Inverter for interfacing advanced energy sources to a utility grid |
April 24, 1984 |
| A transistor is operated in the PWM mode such that a hlaf sine wave of current is delivered first to one-half of a distribution transformer and then the other as determined by steering thyristors operated at the fundamental sinusoidal frequency. Power to the transistor is supplied by a |
| 4426564 |
Parallel resonant induction cooking surface unit |
January 17, 1984 |
| A parallel resonant induction cooking surface unit comprises a voltage fed inverter which drives a load circuit, comprised of a main induction drive coil, a tuning capacitor coupled in parallel with the main induction drive coil, and an inductor coupled in series with the main induction |
