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| Number | Title | Issue Date |
| 7499300 | Self-driven synchronous rectification and voltage stabilization circuit A synchronous rectification and voltage stabilization circuit includes a saturable inductance coil (L1), a synchronous rectifier switch (33), a driving coil (L2) for turning on the synchronous rectifier switch, a discharging coil (L3) whi... | 03/03/2009 |
| 7362598 | Synchronous rectifier gate drive shutdown circuit A power converter that includes a transformer, a bridge input circuit, a self-driven synchronous rectifier circuit, a gate drive circuit, and a gate drive shutdown circuit. The transformer includes a primary winding connected to the bridge input circuit, a first sec... | 04/22/2008 |
| 7352136 | DC-DC converter with reduced surge voltage and an electronic ballast including the converter for a discharge lamp A DC-DC converter reduces a surge voltage developed across a switching element (30) in making the voltage conversion with the use of a transformer (20) inherently having considerable leakage. A snubber circuit is included to absorb the surge energy and... | 04/01/2008 |
| 7265525 | Self-driven scheme for synchronous rectifier having no body diode A voltage converter uses a component such as a JFET or four-terminal power MOSFET having no body diode and exhibiting no body diode conduction characteristic as a synchronous rectifier to reduce switching losses and body diode conduction losses and to support high f... | 09/04/2007 |
| 7139179 | Switching mode power converter having secondary side bias generating and driving circuit to provide synchronous rectification and active clamp A switched mode power converter includes a transformer having a primary winding, a secondary winding, and a bias winding. A primary side power switch is coupled to the primary winding and is adapted to periodically apply an input voltage to the primary winding. An o... | 11/21/2006 |
| 7133298 | High frequency voltage regulating transformer based converter A switching regulator and method of fabricating a switching regulator is disclosed. In one embodiment a switching regulator comprises a transformer having a primary winding and a secondary winding, an inductor (L) connected to an input of the primary winding, and a ... | 11/07/2006 |
| 7075271 | Power controlling apparatus with power converting circuit The invention provides an apparatus for bi-directional power conversion between a DC circuit and an AC circuit, which inexpensively and simply suppresses generation losses of elements and reduces heat generation, wherein a voltage obtained by dividing the U-phase vo... | 07/11/2006 |
| 7071582 | Output rising slope control technique for power converter An output voltage rising slope control technique for a power converter is addressed. The output voltage rising slope control technique according to the present invention basically uses a reference voltage generator to precipitate the rising slopes of multiple output... | 07/04/2006 |
| 7030587 | Configuration of converter switches and machine coils of a switched reluctance machine A system for controlling a switch reluctance machine is provided. The system includes multiple phases located in the switch reluctance machine, each phase having multiple machine coils. Each machine coil is independently connected to a positive side switch circuit a... | 04/18/2006 |
| 6954367 | Soft-switching power converter A pulse width modulated soft-switching power converter has a transformer with a primary winding and a secondary winding, a secondary circuit coupled to the secondary winding, and a pair of main switches and a pair of auxiliary switches coupled to the primary winding... | 10/11/2005 |
| 6937483 | Device and method of commutation control for an isolated boost converter A device and method of commutation control for an isolated boost converter provides a unique commutation logic to limit voltage spikes by utilizing switches on the secondary side to minimize a mismatch between current in the inductor and current in the leakage induc... | 08/30/2005 |
| 6933710 | Soft start techniques for control loops that regulate DC/DC converters Improved soft start techniques for control loops that regulate DC/DC converter circuits are provided. An improved soft start circuit provides a varying voltage at the output of an error amplifier in the control loop during the start-up phase of the DC/DC converter. ... | 08/23/2005 |
| 6845021 | Multi-output DC-DC converter The present invention provides a multi-output DC-DC converter which supplies an input direct voltage to a series circuit consisting of a primary winding (3a) of a transformer (3) and a switching circuit (2) to obtain first and second outp... | 01/18/2005 |
| 6785151 | Quasi-synchronous, magnetic amplifier regulated dc-dc converter A circuit and method provides a regulated dc—dc power conversion. Active switches, saturable core inductors, and a diode are used in a quasi-synchronous circuit. During a part of the cycle (the “blocking interval”) free-wheeling current is routed through free-... | 08/31/2004 |
| 6614131 | Power supply with magnetic reset of saturable amplifier A switched mode power supply having a first circuit provided with a primary winding of a transformer to which a pulse voltage is applied, a second circuit having a secondary winding of the transformer, a reactor provided with a magnetic core and which has... | 09/02/2003 |
| 6504737 | Magnetic core for saturable reactor, magnetic amplifier type multi-output switching regulator and computer having magnetic amplifier type multi-output switching regulator A magnetic core for use in a saturable reactor made of an Fe-based soft-magnetic alloy comprising as essential alloying elements Fe, Cu and M, wherein M is at least one element selected from the group consisting of Nb, W, Ta, Zr, Hf, Ti and Mo, and having... | 01/07/2003 |
| 6501666 | Method and apparatus for magnetic amplifier to reduce minimum load requirement This invention provides a method and apparatus for magnetic amplifier to reduce the minimum load requirement of power supply. The apparatus comprises a voltage-dropper and a current-limiter. Through the voltage-dropper and the current-limiter, the master ... | 12/31/2002 |
| 6490178 | SWITCHING POWER CIRCUIT WHICH SWITCHES VOLTAGE SUPPLIED TO A PRIMARY WINDING OF A TRANSFORMER WITH A SWITCHING ELEMENT TO RECTIFY ALTERNATING CURRENT GENERATED IN A SECONDARY WINDING OF THE TRANSFORMER In a switching power circuit, one end of a primary winding of a transformer having a plurality of windings is connected to a voltage source, and the other end is connected to a return side of the voltage source through a first switching device. At least o... | 12/03/2002 |
| 6449176 | Switching power supply having an operational amplifier control circuit A switching power supply includes saturable reactors and an amplifier control circuit for reducing the differences of a reset amount of the magnetic flux due to the differences of the coercive forces of the saturable inductors. A reset time for the respec... | 09/10/2002 |
| 6330171 | LC filtering with prebiased inductor for a chopping circuit The invention relates to a control circuit, in particular for a load in an automotive vehicle, comprising a chopping circuit, at least one LC filter (F1) means (20) opposing the saturation of the inductor, (L1) of this LC circuit, wherein these latter mea... | 12/11/2001 |
| 6301139 | Self-driven synchronous rectifier circuit for non-optimal reset secondary voltage A power converter has a self-driven synchronous rectification circuit that can operate efficiently with a non-optimal reset secondary voltage waveform that remains at a zero voltage level during a portion of the switching cycle. The power converter circui... | 10/09/2001 |
| 6246209 | Control device for alternating current motor The present invention relates to a control of an AC motor, and in particular to a control device for an AC motor which can prevent an overvoltage from being applied to the motor, and minimize voltage consumption of a reactor itself during the starting and... | 06/12/2001 |
| 6181116 | Power regulator A power regulator is provided which employs a resonant circuit and permits regulation between a certain maximum value and zero. A series resonant circuit is adjusted to regulate power by adjusting the correspondence between the resonance frequency and the... | 01/30/2001 |
| 6150821 | Gradient magnetic field electronic power supply for gradient coil A gradient magnetic field power supply includes an amplifier for supplying current to a gradient coil. Between input and output of the amplifier is connected a feedback circuit which feeds a portion of an output current at the output back to the input and... | 11/21/2000 |
| 6049180 | High voltage regulated supply particularly suited for visual displays A supply is disclosed that develops a high dc voltage that may be applied to the anode of a cathode ray tube (CRT) of a display system. The supply provides the high dc voltage without the need for any high voltage flyback transformers and without the need... | 04/11/2000 |
| 5956238 | Blocking time maintenance circuit for ZVS converters The blocking time maintenance circuit is applied to a resonant-transition ZVS power converter having saturable core reactors to induce a current in the primary of the transformer which enables ZVS. The circuit includes a peak detector for producing a sign... | 09/21/1999 |
| 5838558 | Phase staggered full-bridge converter with soft-PWM switching A full-bridge converter 10 is provided which performs soft switching based on pulse width modulated switching signals. The, converter 10 includes a primary side 12 and a secondary side 14 interconnected through a transformer 13. The primary side 12 includ... | 11/17/1998 |
| 5691891 | Current balancing arrangement for paralleled diode arrangements A rectifier for a switching power supply or the like. The recitifier has a plurality of diodes coupled in parallel, each diode having in series therewith a saturable inductor and a node disposed between the diode and the inductor to form a diode/inductor ... | 11/25/1997 |
| 5612862 | Method and circuitry for controlling current reset characteristics of a magnetic amplifier control circuit Magnetic amplifier post regulator (54) includes magnetic amplifier (42) that has a main magnetic amplifier winding, reset transistor (76), error amplifier (58), and auxiliary magnetic amplifier winding (220). Magnetic amplifier (42) controllably blocks a ... | 03/18/1997 |
| 5592367 | Apparatus for non-contacting feeding of high frequency power The apparatus for non-contacting feeding of a high frequency power according to the present invention comprises a double voltage full-wave rectifier circuit which converts an AC input into a DC output, Royer oscillation circuit consisting of FETs and whic... | 01/07/1997 |
| 5539300 | Power supply device A power supply for an electronic device such as the control circuitry of a thermostat. The power supply has a current transformer with a primary winding in series with the power line that is connected to the heating source, and a secondary winding coupled... | 07/23/1996 |
| 5521810 | Rectifying saturable reactor A rectifying saturable reactor generates a magnetic force in a magnetic iron core in response to a current that flows through an electronic circuit. The saturable reactor makes use of saturable magnetic flux in view of a hysteresis loop of a magnetic mate... | 05/28/1996 |
| 5521808 | Method and circuitry for controlling start-up characteristics of a magnetic amplifier control circuit Start-up control circuit (152) regulates the output voltage (VOS) of a power supply circuit (150). Magnetic amplifier control circuit (54) includes magnetic amplifier (42) and error detection circuitry (58, 68, and 70). Start-up control circuit... | 05/28/1996 |
| 5335163 | Power supply circuit with integrated magnetic components A magnetic circuit with several magnetic components integrated on one or more common magnet cores is utilized in a current supply circuit known per se. The circuit comprises a transformer, the secondary winding ends of which are connected to uniform elect... | 08/02/1994 |
| 5132889 | Resonant-transition DC-to-DC converter The present invention is a circuit and method for reducing switching losses in a full bridge, resonant transition, switching power converter. The converter circuit includes a bridge switching circuit having an FET switch in each leg of the bridge. Each FE... | 07/21/1992 |
| 5126931 | Fixed frequency single ended forward converter switching at zero voltage A single ended forward DC-to-DC converter is operated with a main switch in series circuit with a primary winding of the isolation transformer and an auxiliary switch for charging a reset capacitor also in circuit with said primary winding. The main switc... | 06/30/1992 |
| 5086381 | DC-DC converter A DC-DC converter includes a transformer and a switching element. The primary winding of the transformer and the switching element are connecting in series with a DC power source. A DC output is extracted via a rectifier circuit connected to a secondary w... | 02/04/1992 |
| 5065301 | Switching power supply A switching power supply for controlling an output voltage to a constant value with respect to fluctuations in input or in load, wherein are provided a DC power supply; two dividing capacitors connected in series to both ends of the DC power supply; two s... | 11/12/1991 |
| 4967335 | Saturable transformer regulator for flyback power supply A flyback type power supply has a nominal 12 volt secondary winding that is connected to a rectifier through the primary winding of a saturable transformer. The secondary winding of the saturable transformer is connected in series with the DC load current... | 10/30/1990 |
| 4931920 | Circuit and method for regulating output voltage of a switch mode power supply having a current mode magnetic amplifier A circuit for regulating the output voltage of a switched mode power supply having a current mode magnetic amplifier includes a current transformer for sensing current flow through the magnetic amplifier. The sensed current is provided to a circuit which ... | 06/05/1990 |