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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...
5390064 Current limiters in power utility applications  
A current limiting method and apparatus for preventing fault overload in a utility power transmission system employs a high power, superconducting coil based pulse transformer for saturating the...
4638177 Rotating flux transformer  
A rotating flux transformer which includes a magnetic core having poloidal primary and secondary windings and toroidal primary and secondary windings. Quadrature flux is produced in the magnetic...
4612455 Distributed pulse forming network for magnetic modulator  
A pulse forming network with distributed inductance and capacitance is diosed for use in a magnetic modulator. The magnetic modulator has a magnetic core with a primary winding and a secondary...
4513364 Thermally controllable variable frequency inverter  
A self-oscillating inverter circuit wherein the inversion frequency can be controlled by way of providing a controllable flow of electrical power to a resistor heating means that is thermally...
4506131 Multiple zone induction coil power control apparatus and method  
A plurality of zones of an induction heating coil are individually controlled by varying the current through one or more zones of the coil to obtain a desired temperature profile in a workpiece....
4189672 Variable transformer method and apparatus for preventing short-circuit current flow  
In a variable transformer, two high-conductivity brushes are mounted in a carriage and adapted for longitudinally traversing the transformer winding to contact exposed segments of the winding. By...
4024520 Electrical latching circuit  
This invention relates to an electrical latching circuit, relatively impervious to noise pulses, for being used with a power source for supplying current through a circuit line to an electrical...
4017702 Microwave oven including apparatus for varying power level  
Apparatus for varying microwave power level is included in a microwave oven. The microwave oven includes a magnetron for producing microwaves used for heating and a half-wave voltage doubler for...
3763413 FLUX AMPLIFIER CIRCUITS FOR CONTROLLING INDUCTION MOTORS AND THE LIKE  
An induction motor supplied from a source of sinusoidal alternating current is provided with stator windings and rotor windings. The primary coil of a flux amplifier is connected in circuit with...
3748570 ADJUSTABLE OUTPUT VOLTAGE TRANSFORMER  
An alternating current transformer having an effective variable ratio of output to input voltage is made up of two ferromagnetic cores, one of which is linked by a winding to the input, whereas the...
3617858 EXCITATION OF ALTERNATING CURRENT MACHINERY  
An excitation and control system for heavy-duty electricity generating machines wherein a single-transformer and rectifying means is provided to serve all control purposes. The transformer is...
3384810 Transformer circuit with direct current flux cancellation  
3353171 Magnetic device for indicating the occurrence of an electrical signal  
3316447 Inductively energized unit with means to impede primary current flow  
3253212 Ferro-resonant control elements and variable voltage power source incorporating same  
3252079 Saturable reactor regulating system  
3207976 Progressive magnetic saturation device  
3162803 Magnetic amplifier for active direct current loads  
3059170 Welding system using adjustable current transformer  
3058051 Synchro switched magnetic amplifier  
3038114 Automatic pilot control equipment  
3034038 Control apparatus  
3030570 Magnetic amplifier circuit  
3021474 Magnetic amplifier control apparatus  
3001084 Magnetic amplifier without ringback  
2998564 Magnetic current regulator  
2994831 Magnetic amplifier frequency sensor circuits  
2991409 Power transmissions controlled by saturable reactors  
2989674 Control apparatus for control of the traverse of a hot saw  
2988650 Hall-effect control element with utilization circuit  
2972100 Half-wave magnetic amplifier circuits  
2964690 Speed control for an electrical motor  
2957125 Current regulator  
2948844 Magnetic amplifier  
2937321 Current limiting in the windings of electromagnetic devices  
2918626 Magnetic amplifier  
2897293 Magnetic amplifiers with biased rectifiers  
2897294 Transverse magnetic traveling wave amplifiers  
2892970 Magnetic core resetting devices  
2892092 Power transmission  
2888637 Radio frequency or carrier type transverse magnetic amplifier using squarewave power  
2886658 Inductively reset carrier magnetic amplifier  
2873422 Magnetic amplifier pulse generators  
2862197 Amplitude discriminator  
2859289 Transistor controlled magnetic amplifier  
2854587 Switching systems  
2825865 Automatic constant current regulator employing a saturable transformer  
2817057 Resistive reactor  
2795753 Magnetic controller  
Matches 1 - 50 out of 54 1 2 >