Class 323/248 - Ferroresonant

Subclass of Class 323 - Electricity: power supply or regulation systems
Definition: Subject matter wherein the transformer is associated with
No. of patents: 30
Last issue date: 03/04/2008

Number	Title	Issue Date
7339331	Dimmer circuit with improved ripple control A dimmer circuit arrangement is disclosed including a second control circuit for controlling the operation of a triac for delivering current to a load, and a first control circuit for controlling the operation of an IGBT power semiconductor switch for controlling th...	03/04/2008
7062662	I/O resonance cancellation circuit based on charge-pumped capacitors An apparatus for canceling an effect of power supply resonance is provided. The effect of power supply resonance is a variation in power supply voltage potential. This variation may substantially affect an output buffer by causing the output buffer's output to sag b...	06/13/2006
6856230	Harmonic filtering circuit with special transformer A filter uses a special autotransformer that has a ferromagnetic core with a plurality of legs and flux return bars. A first coil is located on one leg, and a second coil is located on the same leg, but spaced from the first coil. The first coil and at least part of...	02/15/2005
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
6426610	Controlled ferroresonant constant current source A controlled ferroresonant constant current source includes a ferromagnetic core accommodating the below-mentioned inductors. An input coil is to be connected to an alternating voltage source. An output coil is inductively coupled to the input coil, and i...	07/30/2002
6157552	Sub-harmonic detection and control system A distribution series capacitor control system is provided with a sub-harmonic detection module connected to an input signal and operable to detect the presence of at least two distinct types of sub-harmonic content in the input signal. A logical signal p...	12/05/2000
5886507	Controlled ferroresonant transformer A ferroresonant transformer includes a three-legged magnetic core. The core includes a center leg, and first and second flanking legs. Each of the center and flanking legs have respective first and second longitudinal ends. The first flanking leg is posit...	03/23/1999
4893069	Ferroresonant three-phase constant AC voltage transformer arrangement with compensation for unbalanced loads A ferroresonant three-phase constant AC voltage transformer comprising three transformer iron cores with one for each corresponding input supply phase, primary windings and secondary windings formed on each of the transformer iron cores, series reactance ...	01/09/1990
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
4786854	Alternating current voltage regulator using a feedback loop with step filtering An AC voltage regulator includes an output voltage sensing and regulating device having a suitable filter characteristic to attenuate AC components therein occurring in the frequency ranges corresponding to the almost periodic oscillations or abnormal osc...	11/22/1988
4774649	Integrated magnetic resonant power converter A resonant power converter is disclosed which is constructed on an integrated magnetic core, with primary, secondary and tertiary windings occupying separate legs of the core. The tertiary winding is connected in a resonant circuit and induces a flux in t...	09/27/1988
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
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
4565958	AC Line voltage regulator with controlled energy dispenser An AC line voltage regulator having a voltage sensing circuit for sensing and producing signals representative of the difference between a predetermined voltage level and the line voltage level and a load current sensing circuit for sensing and producing ...	01/21/1986
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
4466041	Fault protection system for power supplies that use ferro-resonant transformers A fault detection system for use in power supply systems using ferro-resonant transformers is presented. Current sensing means are used to sense the current flowing in the ferro-resonant circuit associated with operation of the ferro-resonant transformer....	08/14/1984
4439722	Ferroresonant power supply stabilizer circuit for avoiding sustained oscillations A stabilization circuit is provided for use with a ferroresonant power supply to maintain a steady output voltage during power line transients, rapid load changes, or no load condition. The stabilization circuit is responsive to the voltage output of the ...	03/27/1984
4339706	Current controlling A generally figure-of-eight transformer core carries first, second and third toroidal windings spaced along its central leg and is formed with magnetic shunts across the gaps between central and outside legs in the planes between windings. A capacitor is ...	07/13/1982
4339792	Voltage regulator using saturable transformer A voltage regulator using a saturable transformer comprises a transformer having a primary and secondary windings, an AC power source for supplying the primary winding a fluctuating alternating current, and a rectifier connected to the secondary winding f...	07/13/1982
4285023	Rectifier system with failure alarm circuitry A rectifier unit for supplying power to a D.C. load including a transformer having a primary, a secondary and a saturable core, the secondary defining an output section and a control section. A ferroresonance control circuit simulates saturation of the tr...	08/18/1981
4270082	Open-circuit shunt-regulated high-voltage circuit Shunt regulation for a high-voltage circuit including a ferroresonant transformer has control circuitry associated with a low-voltage control winding on the transformer, the control winding being magnetically coupled with the high-voltage secondary windin...	05/26/1981
4242630	Ferroresonant voltage regulator incorporating auxiliary winding for large current magnitudes of short duration An auxiliary winding is provided on a ferroresonant voltage regulating transformer. The transformer is controlled in such a manner that, during start-up of a load connected to the transformer, the auxiliary winding provides all the current for the load, a...	12/30/1980
4156175	Voltage regulation apparatus using simulated ferroresonance An amplitude-regulated, distortion-free sine wave voltage source capable of operating from input sine waves, square waves or quasi-square waves, this ferroresonance-simulating inverter apparatus includes a special control winding and shorting switch there...	05/22/1979
4144462	Emergency lighting fluorescent pack A high frequency self-contained emergency lighting fluorescent pack is exteriorally mountable to a fluorescent fixture either in line with a fluorescent lamp having a length shorter than that normally installed in the fluorescent fixture or in a side-by-s...	03/13/1979
4142141	Ferroresonant voltage regulating circuit A ferroresonant voltage regulator circuit includes a non-saturating transformer, a linear reactor in series with the input, and a capacitor across the non-saturating transformer. Voltage sensing and referencing circuits are inserted in the output. A synch...	02/27/1979
4068157	Regulated multiple transformer system A circuit is provided for providing a regulated d.c. output of a substantially high output current magnitude from an unregulated single or polyphase a.c. input source. Regulation is provided by a single feedback circuit interacting with a plurality of fer...	01/10/1978
4030025	Ferroresonant regulator with supplementary regulation through waveform control A ferroresonant voltage regulator utilizes control of the voltage peak of a signal waveform as a voltage regulation technique. The peak of the voltage waveform is adjusted in response to a feedback control. The regulated output voltage is derived from a p...	06/14/1977
4001665	High efficiency power supply having a reactive buck automatic D.C. voltage regulator D.C. power supply having a reactive buck automatic D.C. voltage regulator which directly controls the rectified D.C. output of a loosely coupled transformer thereby providing load regulation from an unregulated alternating current source. The load current...	01/04/1977
3988662	Variable flux-reset ferroresonant voltage regulator A thyristor controlled ferroresonant voltage regulator in which the output voltage is made adjustable by varying the reset flux level of each of two parallel magnetic core paths upon which the load windings are wound. Decoupling from the alternating curre...	10/26/1976
3965408	Controlled ferroresonant transformer regulated power supply Standard configuration a.c. power transformer core sections are combined with standard configuration solenoid winding sections to provide a saturable core transformer which is arranged to be driven into saturation by applied alternating and direct current...	06/22/1976

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Class 323/248 - Ferroresonant