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| Number | Title | Issue Date |
| 7242275 | Variable inductor A variable inductor which avoids electrical breakdown of the insulation in the control windings when used in high power applications includes a core formed of a permeable magnetic material, the core having three legs, including a center leg and two outer legs. A mai... | 07/10/2007 |
| 7202648 | Fully integrated DC-to-DC regulator utilizing on-chip inductors with high frequency magnetic materials An fully integrated DC-to-DC switching converter having an inductor, where the inductor has magnetic material that may be amorphous CoZrTa, CoFeHfO, CoAlO, FeSiO, CoFeAlO, CoNbTa, CoZr, and other amorphous cobalt alloys. The magnetic material allows for a relatively... | 04/10/2007 |
| 7170383 | Method and apparatus for transferring energy in a power converter circuit A reduced cost energy transfer element for power converter circuits. In one embodiment, an energy transfer element according to an embodiment of the present invention includes a magnetic element having an external surface with at least a first winding and a second w... | 01/30/2007 |
| 7133299 | Zero voltage switching power conversion circuit A switching power conversion circuit comprises a saturable load assembly, a first switching inductance coil assembly and a second switching inductance coil assembly. The saturable load assembly is composed of a load and a saturable reactor. The first switching induc... | 11/07/2006 |
| 7091676 | Arc maintenance device for high density discharge lamps including an adaptive wave form monitor A supplemental arc maintenance electrical supply for a high density discharge (HID) lamp (L) for applying a high frequency supplemental arc voltage to maintain the arc during a period of unstable or intermittent AC supply in addition to or in lieu of the voltage or ... | 08/15/2006 |
| 7023391 | Electromagnetic field generation antenna for a transponder An antenna for generating an electromagnetic field including several planar inductive cells parallel connected in an array and forming, in association with at least one capacitor, an oscillating circuit adapted to being excited by a high-frequency signal. ... | 04/04/2006 |
| 7023152 | Driving control device for actuator A driving control device for an actuator comprises a driving device to drive an actuator having an electric motor (30) and a driving control device (50) to control the rotation of the electric motor (30) by controlling the driving device. The dr... | 04/04/2006 |
| 6946806 | Method and apparatus for controlling minimum brightness of a fluorescent lamp An efficient power conversion circuit for driving a fluorescent lamp uses a minimum pulse generator circuit to control the minimum on-time of a time modulated signal to increase the dimming range of the fluorescent lamp operating over a wide range of temperature and... | 09/20/2005 |
| 6782513 | High power factor integrated controlled ferroresonant constant current source A method of designing a high power factor integrated ferroresonant constant current source includes the steps of providing an input coil disposed about a ferromagnetic core and to be coupled to an AC voltage source. An output coil is to be coupled to a load. A contr... | 08/24/2004 |
| 6178098 | Phase-shifted post-regulator, method of operation thereof and power converter employing the same For use in a power converter having an inverter coupled to an output rectifier, a post-regulator, a method of operating the same and a power converter incorporating the post-regulator or the method. In one embodiment: (1) a switching circuit, having at le... | 01/23/2001 |
| 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 |
| 5939998 | System and method for reducing quiescent current in a microcontroller A system having reduced quiescent current drawn from a power supply. The system includes a device having a status. Moreover, the system includes a microcontroller, having an active and a sleep mode of operation, for polling the status of the device during... | 08/17/1999 |
| 5903417 | Self-excitation type switch power supply unit with overcurrent protection A self-excitation type switch power supply unit with overcurrent protection. For adopting a simple and reliable current negative feedback protective circuit to coordinate with a complementary bridge circuit, a positive feedback circuit without DC biasing ... | 05/11/1999 |
| 5880946 | Magnetically controlled transformer apparatus for controlling power delivered to a load A magnetically variable transformer having primary and secondary windings wound on a magnetic core wherein the transformer core with associated windings is placed in close proximity to an independently wound control coil. The control coil is positioned in... | 03/09/1999 |
| 5737203 | Controlled-K resonating transformer An LC resonant circuit. The resonant circuit includes a resonant capacitor and a transformer. The transformer comprises a magnetic core having a primary winding, secondary winding and control winding wound on the core. The primary winding is loosely coupl... | 04/07/1998 |
| 5682304 | Superconductive electromagnetic energy storage apparatus and a method for storing electromagnetic energy A superconductive system for receiving electromagnetic energy from an outside source, storing electromagnetic energy in two interacting forms of DC and AC electric current, and delivering electromagnetic energy to an outside load wherein the electromagnet... | 10/28/1997 |
| 5656870 | Current control for superconducting magnetic energy storage system A superconducting magnetic energy storage system for applying power to a load includes a superconducting magnet, the inductor of which is supplied with current via a source which may be preset to a desired value of current, and wherein a feedback loop res... | 08/12/1997 |
| 5568372 | Circuit for detecting negative output rails A detection circuit for use in an electrical power converter having at least one negative output rail, for detecting the voltage of the negative output rail and for converting the voltage to a positive output voltage. The detection circuit includes an inp... | 10/22/1996 |
| 4980811 | Power source apparatus A power source apparatus includes a transformer having a plurality of paired winding portions of primary and secondary windings wound around cores divided by a gap, a driver, connected to the primary winding of the paired winding portion, for switching en... | 12/25/1990 |
| 4862040 | Frequency-modulated inverter-type ballast In an inverter-type fluorescent lamp ballast, the inverter is powered from an ordinary electric utility power line by way of a rectifier means providing to the inverter a DC voltage having magnitude variations of about plus/minus 30% occurring at twice th... | 08/29/1989 |
| 4858095 | Magnetron drive apparatus In a magnetron drive apparatus a high frequency voltage converted and outputted by a frequency converter is inputted to a primary winding of a transformer and a high voltage power outputted from a secondary winding of the transformer is rectified and supp... | 08/15/1989 |
| 4853611 | Inductive, electrically-controllable component An inductive component for universal use in any electrical/electronic circuits, whose coefficient of self-induction (L) is independent of the signal, is constant, electrically controllable and can be varied significantly. The component (10) comprises two ... | 08/01/1989 |
| 4841428 | Non-saturating magnetic amplifier controller A magnetic amplifier including a magnetic core having a primary leg, a secondary leg, and a control leg. A primary winding is wound about the primary leg of the magnetic core for generating a non-saturating magnetic AC flux in the magnetic core, and a sec... | 06/20/1989 |
| 4833338 | Ferroresonant regulator for inductively coupled power distribution system A ferroresonant regulator for use in an inductively coupled high frequency power distribution system. A constant current resonant power source, comprising a sine wave oscillator (12), an amplitude controlled amplifier (16), a power amplifier (20), and an ... | 05/23/1989 |
| 4816986 | Power control device for the magnetron of microwave oven A power control device for a microwave cooking oven includes a regulator of the anode voltage of the magnetron and a heater voltage source. The anode voltage regulator includes a d.c. voltage bridge-type converter, a transformer, a rectifier and a filter.... | 03/28/1989 |
| 4811187 | DC-DC converter with saturable reactor reset circuit A DC-DC converter having a transformer having a primary winding and a secondary winding; means for supplying DC input voltage to the primary winding; at least one switching element connected between the DC input voltage supplying means and the primary win... | 03/07/1989 |
| 4802080 | Power transfer circuit including a sympathetic resonator A power transfer circuit includes first and second windings (L1, L2) sharing a common magnetic core (101). Each winding has associated with it a parallel capacitor to thus form a pair of "tank" circuits. The first winding (L1) is connected at one end to a... | 01/31/1989 |
| 4800476 | PWM inverter with a saturable core A PWM inverter including a saturable core and a main circuit comprising a series circuit of a main winding and a resistor in which switching means applies a DC voltage across the main circuit by time ratio control with the polarity inverted alternately, a... | 01/24/1989 |
| 4791542 | Ferroresonant power supply and method A power supply is disclosed which comprises a ferroresonant circuit, the ferroresonant circuit including a transformer with a core of magnetic material, a primary winding, a secondary winding, and reactive means coupled with at least one of the windings. ... | 12/13/1988 |
| 4788634 | Resonant forward converter A resonant forward converter at a switching frequency of 10 MHz provides a small volume point-of-load converter for distributed power systems. The leakage inductance of a transformer is made negligibly small relative to the magnetizing inductance of the t... | 11/29/1988 |
| 4692854 | Method and apparatus for modulating inverter pulse width A method and apparatus are disclosed for use with a battery powered inverter for powering a load through a ferroresonant transformer. The current flow through the inverter-ferroresorant transformer is sensed and is utilized to modulate the inverter's puls... | 09/08/1987 |
| 4656412 | Ferroresonant flux coupled battery charger A battery charger for incorporation into an electric-powered vehicle is disclosed. The charger includes a ferroresonant voltage-regulating circuit for providing an output voltage proportional to the frequency of an input AC voltage. A high frequency conve... | 04/07/1987 |
| 4631652 | Frequency controlled resonant regulator The primary winding of a high leakage inductance power tranformer is coupled to a source of unregulated voltage and to a square wave voltage generator that includes first and second alternately conducting output switching transistors. A voltage controlled... | 12/23/1986 |
| 4631471 | Inductor apparatus for application of ferroresonant regulators An inductor structure is combined with a ferroresonant regulator as a filter inductor in one instance, and as a regulating inductor in another. In one example, a ferroresonant voltage regulator includes a pair of shunt filters at its output to reduce the ... | 12/23/1986 |
| 4626976 | Switch mode power supply having magnetically controlled output A magnetically controlled switching regulator which controls an output voltage using a saturable reactor, wherein the saturable reactor is constituted by a first winding through which an output current flows and a second winding through which a reset curr... | 12/02/1986 |
| 4605999 | Self-oscillating high frequency power converter A self-oscillating power converter utilizes a MOSFET power transistor switch with its output electrode coupled to a tuned network that operatively limits the voltage waveform across the power switch to periodic unipolar pulses. The transistor switch may b... | 08/12/1986 |
| 4604556 | Television receiver load compensation circuit A deflection circuit is coupled to a horizontal deflection winding for generating scanning current in the winding. A retrace pulse voltage is developed across the deflection winding during the retrace interval. A flyback transformer is coupled to the defl... | 08/05/1986 |
| 4595973 | Switching power supply A switching power supply has a saturable transformer provided with first to fourth windings. The first winding is inserted in series in a first path from a DC power source to a primary winding of a power transmitting transformer. A main switch is inserted... | 06/17/1986 |
| 4593167 | Electronic microwave oven power supply A power supply for a magnetron is adapted to be powered from a regular power line and comprises an inverter means operable to provide an AC voltage of relatively high frequency. This relatively high-frequency AC voltage is applied to a step-up transformer... | 06/03/1986 |
| 4558229 | Series ferroresonant regulated rectifier with added capacitor shunting the saturating reactor winding A series type ferroresonant regulator is modified by adding a second ferro-capacitor in parallel with the primary winding of the saturating transformer. This arrangement allows the transformer to operate at a much cooler temperature than is possible with ... | 12/10/1985 |
