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| Number | Title | Issue Date |
| 8102160 | Saturation preventing power factor improving method and apparatus Provided are a method and apparatus for improving the power factor of an input power. The apparatus includes an input unit receiving the input power, a power factor correction unit correcting the power factor of the input power applied to the input unit, and a satur... | 01/24/2012 |
| 6472827 | Parallel-resonant inverter-type fluorescent lamp ballast A push-pull inverter is supplied from an inductively current-limited DC voltage source by way of a center-tap on a transformer having significant inductance. This transformer inductance is parallel-coupled with a capacitance means. The inverter is made to... | 10/29/2002 |
| 6384588 | Method and apparatus for asymmetrically inducing voltages in transformer secondary windings while avoiding saturation of the transformer core A method for magnetically inducing voltages in the secondary windings of a transformer without saturating its core. The method includes (a) applying to a first primary driven winding a first set of voltages, thereby generating (i) a first current in the f... | 05/07/2002 |
| 6348782 | Uninterruptible power supply systems, voltage regulators and operating methods employing controlled ferroresonant transformer circuits An uninterruptable power supply system for producing an AC voltage from at least one of a DC power source or an AC power source includes an input terminal configured to receive an AC voltage from an AC power source, and an inverter operative to produce an... | 02/19/2002 |
| 6320360 | Energy dimmer drive and energy pilot The invention includes an energy dimmer drive and energy pilot that controls the amount of current and voltage conveyed from an input to a load, based on values selected by the user. The current and voltage is varied by controlling the spacing between the... | 11/20/2001 |
| 5586019 | Voltage converter In the voltage converter, a current flowing through a primary coil of a voltage transformer is turned on/off by FETs, an AC voltage induced at a secondary coil of voltage transformer is rectified and applied to a choke coil including two coils, a saturabl... | 12/17/1996 |
| 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 |
| 5515262 | Variable inductance current limiting reactor An electrically variable current limiting reactor which is usable in association with a power supply for an electrostatic precipitator is disclosed herein. The current limiting reactor is capable of having the inductance value thereof varied responsive to... | 05/07/1996 |
| 5465010 | Electrical [arrangement] distribution system for vehicle An electrical arrangement is disclosed for use in supplying electrical power to the units in a motor vehicle. The arrangement comprises a battery, and an inverter to receive power from the battery and to generate a high frequency signal at an intermediate... | 11/07/1995 |
| 4994685 | Regulated power supply and method The subject invention is a power supply comprising a magnetic amplifier, filter, back-up battery, switch-over regulating circuit and error amplifier. The magnetic amplifier receives a plurality of AC pulses and controls the pulse width of the pulses. The ... | 02/19/1991 |
| 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 |
| 4695917 | Inductive power controller Power to a load is controlled by actuation of an inductive circuit from a first condition of low inductance to a second condition of higher inductance in response to a preselected overcurrent condition. In a first preferred embodiment, the inductive circu... | 09/22/1987 |
| 4654503 | Welding current power supply with inductive clipping A welding power supply for applying welding current to materials to be welded, particularly, for seam welding operations for thin materials, wherein the power loss of the unit is minimized, a wide range of welding conditions can be accommodated, and the w... | 03/31/1987 |
| 4642549 | Ferroresonant constant AC voltage regulator A constant voltage regulator involving a feedback loop by which frequency dependence may be eliminated and at the same time, hunting phenomenon in case of low load can be suppressed without inserting a dummy resistance or a reactor in its circuit, whereby... | 02/10/1987 |
| 4532582 | Voltage regulator system using magnetic controllers A voltage regulator system for receiving relatively high frequency electrical energy from a source and providing a regulated relatively low frequency electrical energy output wherein a passive device sensing means comprising only electrically passive elem... | 07/30/1985 |
| 4441149 | Multi-voltage transformer input circuits with primary reactor voltage control A multi-voltage transformer input circuit, which may have multi-phase input, and where the input or each phase of the input has a primary reactor voltage control, is provided by the present invention. The primary winding of the transformer, or each phase ... | 04/03/1984 |
| 4353113 | Switch mode converters A magnetic amplifier which has a main winding and at least one secondary reset winding, and a core composed of amorphous magnetic material, the amplifier being arranged to operate at a frequency greater than 20 KHz. The invention also includes ... | 10/05/1982 |
| 4346340 | Method and means for controlling the flux density in the core of an inductor In a method for the enhancement of the A.C. performance of an inductor such as a transformer or choke, the tendency of the core of the inductor to become saturated by flux arising from low frequency A.C. or D.C. currents flowing in the inductor winding is... | 08/24/1982 |
| 4305032 | Broad band saturable reactor regulated power supply A saturable reactor regulated power supply utilizes a power oscillator to convert line voltage to a higher frequency voltage. The high frequency voltage is passed through the gate windings of a saturable reactor to an output circuit including an output po... | 12/08/1981 |
