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7446512 Resonant switching power supply device  
For the purpose of providing a resonant switching power supply device having a wide output voltage variable range by changing its switching frequency, the resonance circuit thereof comprises a...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
3916295 Ferroresonant voltage regulator stabilized for light load conditions  
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...
3914685 Regulated ferroresonant power supply with soft start  
An improved regulated DC power supply using a ferroresonant power transformer. The transformer includes a primary winding which is separated from a secondary winding and a resonant winding by a...
3894280 Frequency limited ferroresonant power converter  
A transformer in combination with a push-pull transistor switch forms the inverter of a DC to DC converter. Feedback from the rectified output of the transformer ferroresonant winding controls the...
3889176 Reactive regulator  
A reactive voltage regulator of the shunt type which effectively has a linear inductance in series between input and output terminals and has separate capacitive and inductive reactances shunting...
3875493 Ferroresonant power converter with control of inverter frequency and sensing of saturation condition  
A transformer in combination with a push-pull transistor switch forms the inverter of a DC to DC converter. Feedback from the rectified output of the transformer ferroresonant winding controls the...
3824449 FERRORESONANT VOLTAGE REGULATING CIRCUIT  
A ferroresonant voltage regulator circuit includes a saturable transformer, an unsaturable transformer in series with the input, and a capacitor across the saturable transformer. Voltage sensing...
3818314 FREQUENCY CONTROLLED INVERTER  
In a regulated dc to dc converter, a ferroresonant regulator is combined with a push-pull inverter on the same transformer, and a feedback circuit controls the frequency of the inverter in response...
3781630 MEANS AND METHODS FOR FERRO-RESONANT FLOAT CHARGING CIRCUITS  
The invention comprises a circuit in which a ferro-resonant transformer is used to control operation of a battery charger in which the voltage supplied to the charging circuit by a first secondary...
3778699 RESONANT TYPE CURRENT REGULATOR PROVIDING A CONTINUOUS REGULATION  
A resonant type current regulator in which a controlled inductive impedance is provided in series or in shunt connection with the current path. A control is provided to vary the impedance value of...
3739255 HIGH FREQUENCY FERRORESONANT TRANSFORMER  
A high frequency ferroresonant regulator circuit having a saturable core structure comprised of a first core of a square loop magnetic material and a second core; the first core having a first...
3739257 VARIABLE FLUX-RESET FERRORESONANT VOLTAGE REGULATOR  
A thyristor controlled ferroresonant voltage regulator circuit in which the output voltage is made adjustable by varying the reset flux level of each of two parallel magnetic core paths upon which...
3679962 HIGH FREQUENCY PARAMETRIC VOLTAGE REGULATOR  
A parametric regulator in which an inverter is positioned between the input source of power and a parametric device to provide the parametric device with a high frequency input. The output of the...
3679966 CLOSED LOOP PARAMETRIC VOLTAGE REGULATOR  
A parametric voltage regulator in which the inductance component of the resonant circuit of a parametric device is varied in response to changes in the output voltage, caused for example by changes...
3659191 REGULATING TRANSFORMER WITH NON-SATURATING INPUT AND OUTPUT REGIONS  
A three-path parametric regulating and filtering transformer having an adjustable output voltage. The regulating transformer includes a magnetic core having input, output and saturable regions, an...
3612988 FLUX-GATED VOLTAGE REGULATOR  
A voltage regulator in which an inductor having a saturable core is connected in series with a capacitor, the output being taken from across the inductor. After startup, the combined effect of the...
3579088 FERRORESONANT TRANSFORMER WITH CONTROLLABLE FLUX  
A ferroresonant transformer with means for varying saturation flux capacity for controlling the transformer output. A ferroresonant transformer with at least a portion of the core structure...
3573606 CLOSED-LOOP FERRORESONANT VOLTAGE REGULATOR WHICH SIMULATES CORE SATURATION  
In a ferroresonant voltage regulator of the type in which transformer core saturation is simulated by the switching of a separate inductor effectively across the ferrocapacitor in response to the...
3573605 CLOSED LOOP FERRORESONANT REGULATOR  
The transformer core of a ferroresonant regulator includes a main core portion on which is wound the output winding, a control portion on which is wound a compound winding, and a saturating...
3548292 SINGLE CORE MAGNETIC VOLTAGE REGULATOR  
3525035 CLOSED LOOP FERRORESONANT VOLTAGE REGULATOR WHICH SIMULATES CORE SATURATION  
3205425 Voltage stabilized converter devices  
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