Matches 151 - 200 out of 242 < 1 2 3 4 5 >
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4896242 Direct AC-DC converter fault protection system  
In a direct AC/AC converter, fault protection is performed with a minimal number of fault detecting devices and the rating of such fault detecting devices is reduced while still being able to...
4896254 Protective power controller  
A power controller system for providing electrical power to a multiplicity of loads at outputs thereof under direction of a plurality of input controllers operating a corresponding plurality of...
4891742 Procedure and device for eliminating interference generated by power switches  
Device for eliminating interference in a given electrical signal generated by one or several power switches. The device includes an electronic switch interposed on the line of propagation of the...
4876637 Power converter and method of controlling the same  
A power converter converts AC input power into AC output power to which a load is connected. This power converter comprises a controller for controlling power converting operation of the power...
4825349 Emergency D.C. power supply with the emergency state being indicated by polarity reversal  
This power supply is intended, more particularly, for powering a user digital terminal from a remote terminal in an integrated service digital telephone network. It comprises a main D.C....
4811190 Capacitive boost circuit for extending hold up time  
A circuit for extending the operation of an electrical load after interruption of its power source. The circuit includes bulk capacitors charged by the power source and regulated to a predetermined...
4805083 Low cost automatic voltage doubler switch  
An automatic voltage doubler switch includes a triac for converting a rectifier arrangement from a direct to a doubler mode of operation. Drive current for the triac is supplied by a resistor and...
4797800 Power regulating system for an engine generator  
A power generating system for an engine generator having an engine, an AC generator driven by the engine and an inverter for reconverting a rectification output of a main output winding of the AC...
4782280 Transistor circuit with E/C voltage limiter  
In a series-regulation transistor (T 1 ), which is driven by a drive circuit (10), for generating a constant voltage across a load (R L ) the occurrence of comparatively large substrate currents in...
4779027 DC to DC converter with overvoltage protection circuit  
An overvoltage protection circuit limits the output voltage of a DC to DC converter to a maximum desired output voltage. An output voltage sensing circuit includes a semiconductor device such as a...
4766364 Parallel power systems  
A d.c. power supply system comprises a plurality of voltage regulating power supplies connected in a master slave configuration, the number of regulators being one greater than required to provide...
4764684 Static converter comprising a protective filter against high-frequency disturbanes  
The protective filter comprises an internal reference plane, electrically insulated from the converter housing and acting as ground plane for the internal elements of the static converter, and...
4760324 Non-dissipative snubber circuit for high-efficiency switching power supplies  
A high efficiency switching power supply includes a non-dissipative snubber circuit which provides dual polarity power utilized by a driver of the switching transistor. The snubber circuit,...
4752852 Electronic fuse  
An electronic fuse is intended to be triggered should the current from a load (LA) exceed a predetermined value. The load current is restricted first by a switch in series with the load, the switch...
4739436 Surge suppression circuit  
A voltage surge suppression circuit employs two series connected metal oxide varistors and a power interrupter to provide suppression of all modes of voltage surge while providing protection...
4734843 Electrical power control systems  
A power control system for the remote control of one or more remote power supply circuits in which a power controller which comprises means for producing an a.c. control signal which is arranged to...
4731655 Protection circuit for improper line voltage  
A video display apparatus includes a protection circuit for preventing damage due to the application of excessively high line voltage. The video display apparatus includes a start-up circuit that...
4713741 Excitation control apparatus for rotary electric machine  
An excitation control apparatus for a rotary electric machine according to this invention is such that principal portions of an automatic voltage regulator are dualized by effectively combining...
4675576 High-reliability high-efficiency electronic ballast  
An electronic ballast is adapted for operation on regular 120 volt/60 Hz power line voltage and comprises: (i) full bridge rectifier means, (ii) ripple filter means consisting of an LC circuit...
4672523 Protective device for a load connected to a power supply line of an electric power system  
The present invention relates to a protective device for a load connected to a power supply line of an electric power system, comprising an LC network having low-pass characteristics, connected...
4663571 Electronic ballast with ground-fault protection  
An electronic ballast is adapted for operation on regular 120 Volt/60 Hz power line voltage and comprises: (i) full bridge rectifier means, (ii) ripple filter means consisting of an LC circuit...
4644228 Series-resonant parallel-loaded fluorescent lamp ballast  
A source of high-frequency voltage is applied directly across a series-resonant L-C circuit. A fluorescent lamp and a Varistor are both connected in parallel with the capacitor of this L-C circuit....
4639851 Method and apparatus for firing angle control of series connected thyristor switches  
To eliminate thyristor failure due to voltage imbalance across series-connected thyristors during reverse voltage recovery caused by current discontinuity under continuous pulse application to the...
4634932 Lighting system  
Subject invention constitutes a low-voltage limited-power (Class 2) fluorescent lighting system consisting of the following principal component parts: (a) a power-line-operated inverter power...
4631655 Power distribution system  
A power distribution system that provides supervision and protection. Hall effect devices are used to monitor power from a central power supply to a plurality of power converters. Fuses are...
4629969 Apparatus for generating a signal indicative of a fault occurring in an electric circuit connected to an AC network  
Apparatus for generating a signal indicative of a fault occurring in an AC electric circuit connected to an AC network (UW). The AC circuit (1) comprises a series connection of at least one...
4628460 Microprocessor controlled phase shifter  
A new method and apparatus for controlling the conversion of AC electrical energy into DC electrical energy. A microprocessor control system is operatively connected to an AC source and to a...
4616302 Over-current sensing circuit for switching-type power supply  
An over-current sensing circuit for use with a switching-type power supply for achieving fold-back, which senses not only the load current drawn from the power supply, but also the voltage at the...
4484257 Series-connected assembly of electronic switches  
The present invention consists in connecting an auxiliary D.C. voltage source to a series-connected assembly constructed of electronic switches, whereby even when the electronic switches in the...
4453193 Overcurrent protection for push-pull circuits  
Overcurrent protection is obtained in a push-pull network by circuitry repeatedly comparing signals indicative of the instantaneous current flow through the push-pull switching elements with a...
4439819 Switching regulator with controlled simulated load  
A switching regulator with controlled simulated load has a control which connects and disconnects the simulated load to the output of the regulator. The control is responsive to an error signal of...
4439806 Short-circuit protection device for a DC control element  
A short-circuit protection device for a DC control element has at least one transistor which is addressed by timing pulses obtained by comparison of a triangular voltage with a control voltage....
4437133 Current source inverter commutation-spike-voltage protection circuit including over-current and over-voltage protection  
An adjustable-frequency three phase motor control system (2, CSI, M) is provided with a spike voltage clamp (SVC) to control the magnitude of voltage spikes generated during commutation of the...
4428023 Electronic protective circuit  
The rectifiers for generating direct-currents or hybrid or complex currents for inductive loads must be protected against fault currents which can arise due to faulty operating conditions in the...
4403213 Power supply diagnostic system  
A digital controller used in regulating the output of a power supply including a diagnostic circuit for sensing the failure of a component in the power supply. Upon the occurrence of a fault,...
4363064 Overcurrent protection system  
An overcurrent protection system adaptable for use with power controllers the single or multi-phase ac, or dc types includes a load current sensing element in combination with an overcurrent...
4288831 Shutdown circuit for a switching power supply  
A switching mode power supply provides a D.C. output voltage having a value related to the duty cycle of the supply's controlled oscillator produced signal. The inventive shutdown circuit inhibits...
4281376 Protected converter arrangement  
A protected converter arrangement having electronic power circuitry using controlled valves and electronic information-processing control circuitry. The electronic power circuitry is provided only...
4275430 DV/DT Protection circuit device for gate turn-off thyristor  
A snubber circuit is connected between the anode and cathode of a gate turn-off (GTO) thyristor. To the GTO thyristor a saturable reactor is connected in series. A gate off signal is supplied to...
4272816 Overcurrent protecting apparatus  
In an overcurrent protecting apparatus for interrupting overcurrent in accordance with a coordination tripping curve characteristic, there are provided a microcomputer, a current/voltage converter...
4271460 Soft turn-on power  
A circuit for suppressing surge or transient currents between a DC power supply and a capacitive load includes a suppression impedance of relatively high impedance connected in series with the load...
4251847 DC Converter  
The input dc voltage is used to operate an astable multivibrator, the output of which is supplied to an emitter-follower that is coupled to an amplifier through a current-limiting resistor, so that...
4236198 Switching regulator  
A switching regulator includes an inrush current protective resistor and a starter circuit for a pulse width modulator consisting of a starting resistor and a capacitor. At initial starting mode,...
4233558 Regulated dual DC power supply  
A dual section power supply, one section for supplying high voltage dc po and the other section for supplying low voltage dc power, are each connected to a common ac source. The high voltage...
4225911 Apparatus and method for reducing overvoltage transients on the outputs of a VSCF system  
An apparatus and method for reducing the overvoltage transients present on the alternating current power signals provided by the cycloconverters of a variable speed constant frequency (VSCF) system...
4195333 DC to DC voltage converter  
The DC to DC voltage converter consists of two single ended pulse width modulated converters with a single voltage control loop, a power balancing control loop and overload protection circuitry....
4191992 Method of and apparatus for enabling soft-failure of modular power converter systems, including RF generator systems, embodying switching components in the power conversion  
The disclosure is concerned with enabling modular power converter systems, including RF generators or transmitters involving such conversion, employing switching components such as SCRs in the...
4164785 Multiphase to single phase and frequency converter system  
A multiphase to single phase electrical energy converter wherein the frequency is converted from a relatively high frequency, in order of 1,000 hertz, to a relatively low frequency, as for example,...
4148088 Electronic circuit breaker  
An electronic circuit breaker feeding a d-c/d-c converter from a power supply common to several such converters includes a normally saturated main or switching transistor T 1 in series with the...
4074346 Power supply protective circuit  
In a high current power supply controlled by thyristors mounted in antiparallel in the primary of the power transformers, saturation of the transformers is prevented by a detection circuit...
Matches 151 - 200 out of 242 < 1 2 3 4 5 >