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5565714 |
Power conservation circuit
A power conservation circuit having a low voltage power supply for powering a first and second switch. The first switch connects output terminals to either the low voltage power supply or a powered...
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5563802 |
Generator power system and method
An integrated power system includes an engine/generator power supply integrated with storage batteries to provide household-like AC power. For a small load demand, the storage batteries are used to...
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5559704 |
Method to compute horsepower required by an internal combustion engine coupled to an auxiliary alternator
A method for determining gross engine horsepower of an internal combustion engine coupled in driving relationship to an alternating current electric alternator, the alternator supplying electric...
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5555151 |
No-brake power transfer phase balance sychronization sense circuit and method
A poly-phase no-break power transfer phase balance synchronization sense circuit for an electric power generation and distribution system having a present source of electric power supplying...
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5532525 |
Congeneration power system
A secondary power system eliminates the need for an automatic transfer switch and permits simultaneous supply from different sources. Primary power is rectified and connected to a DC bus, an AC...
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5532523 |
Uninterruptible power system
An improved uninterruptible power system including a UPS auto off circuit, a current limit protecting circuit, a power on overload protecting circuit, a simple charging circuit, a relay driver...
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5532524 |
Distributed power regulation in a portable computer to optimize heat dissipation and maximize battery run-time for various power modes
A system for distributing power throughout a computer system, preferably a portable computer, while still maintaining a desired power mode hierarchy so that the most critical components or...
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5530296 |
Power supply switching apparatus
A power supply switching apparatus for switching power supplies used to all electronic appliance such as a pager and a portable telephone is described. A battery pack includes a battery and is...
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5514915 |
Shunt connected superconducting energy stabilizing system
A shunt connected energy stabilizing system with isolation switching for providing stored energy to loads or to a utility or industrial electrical distribution system or source of electrical power....
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5510659 |
Electrolysis inhibiting marine energy management system
Supply of ac current from the marina source to the boat's DC loads is permitted only when an isolation relay completes the electrical circuit therebetween. A control means monitor the boats battery...
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5501083 |
Control apparatus and method for an air conditioner compressor
A compressor of a refrigeration cycle is normally driven by a commercial power source. During a power failure, the compressor is driven by an auxiliary solar power source, wherein the compressor is...
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5502340 |
Measuring process for obtaining a switching command in a rapid changeover device
A measuring process for obtaining a switching command in a rapid changeover device in which an abrupt change in the voltage in a consumer device is detected and a voltage difference is formed using...
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5500562 |
Power switch arrangement
A split battery contact arrangement (10) for a low voltage portable electronic product having a first circuit (18) and second circuit (18) comprises a split positive battery contact having a first...
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5500561 |
Customer side power management system and method
A customer side power management system includes a power transducer coupled to the electric lines from the utility. The power transducer senses stochastic peak power demands from the electric...
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5498913 |
Power supply control apparatus with a manually operable control switch
A backup power supply 7 is connected to a load via a switching circuit. When the supply of electric power from a main power supply is stopped, the backup power supply 7 supplies electric power to...
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5493218 |
Magnetic detecting apparatus with a variable voltage power supply
A magnetic detecting apparatus including a magnetic sensor for detecting the displacement of a member which is detected by a variation in the voltage, a sampler for sampling the voltage detected by...
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5493155 |
Electric power supply system
This electric power supply system includes an air conditioner serving as load, a solar photovoltaic cell for supplying power to the air conditioner, and a system power control circuit and further...
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5488258 |
Circuit for muting noises in a power amplifier
A power detector is provided for detecting closing of a power switch in a power supply, for producing a power-on signal after a predetermined time from detection of the closing of the power switch....
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5488279 |
Dual power refrigerator
A rotary-compressor control system for electric refrigerators using rotary compressors for cooling the inside of the refrigerators, in which a battery for feeding direct-current power, an inverter...
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5483108 |
Uninterrupted distributed storage supply system
The invention relates to a supply system, with uninterrupted distributed storage, for sensitive operation systems supplied from the public electric energy distribution network (10) or an emergency...
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5483463 |
Uninterruptible power supply (UPS) and method
A UPS having a ferroresonant transformer is selectively switched from AC line voltage to an inverter by a control method and apparatus using fuzzy logic to select an optimum switching point. The...
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5483464 |
Power saving apparatus for use in peripheral equipment of a computer
An apparatus for use in the peripheral equipment of a computer reduces the needless consumption of power. Once it has been determined that the computer has not been used for a predetermined period...
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5483635 |
Circuit for protecting a load control device from high and low voltage conditions
A protective device for a load-control device which provides preservation of the load-control function of a CPU and prevents misoperation, even if an abnormality occurs, and which comprises a CPU,...
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5469002 |
Bi-level current limiting circuit and battery using same
A bi-level current limiting circuit is provided for purposes of maintaining safe battery operation in hostile or otherwise volatile environments. The bi-level current limiting circuit includes two...
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5465011 |
Uninterruptible power supply with improved output regulation
A microprocessor based uninterruptible power supply generates an AC electrical output power from an AC input source when the AC input source is within settable voltage limits and from an auxiliary...
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5461263 |
Method of phase synchronization between two AC signals
An uninterruptible power supply for supplying a load with AC output power generates the AC output power from an AC input source when the AC input source is within settable voltage limits and...
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5440179 |
UPS with bi-directional power flow
AS uninterruptible power supply (UPS) is disclosed in which AC line power is used to charge back-up battery and to operate a load during a stand-by mode of operation of the UPS. In the back-up mode...
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5428252 |
Power supply interruption detection and response system for a microcontroller
A microcontroller power management system wherein the voltage of a power supply is monitored and the microcontroller central processing unit ("CPU") receives an interrupt signal when the supply...
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5426616 |
Semiconductor IC device having a voltage conversion circuit which generates an internal supply voltage having value compensated for external supply voltage variations
A voltage conversion circuit of the present invention is equipped with means for generating a first voltage stabilized with respect to ground potential of a semiconductor integrated circuit device...
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5422453 |
Handle actuator for a circuit interrupter handle
A handle actuator is provided for a circuit interrupter that has a handle or toggle pivotally movable between operative positions. The handle actuator has a pair of pins that fit tightly on the...
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5422808 |
Method and apparatus for fail-safe control of at least one electro-mechanical or electro-hydraulic component
A fault management apparatus and method are described for a system that includes at least one electro-mechanical or electro-hydraulic component, such as a system valve or main discharge pump in a...
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5420783 |
Control logic power down circuit
A secondary low voltage regulator for systems having low voltage control logic and high voltage devices susceptible to thermal damage due to loss of control logic power. When a power failure...
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5420497 |
Direct current power unit having main and secondary direct current power supplies
A direct current power unit has main and secondary direct current power supplies, a serial circuit, and first and second parallel circuits. One terminal of the secondary direct current power is...
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5418403 |
System for conveniently providing load testing termination of an AC power source having at least one battery
An AC uninterruptible power source is disclosed that provides multi-phase wer output signals for actual use and a selectable single phase power output signal for use in testing. The AC...
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5414475 |
Method of operating a low standby power system for a television receiver
A television receiver includes a microprocessor, a switched mode power supply and a storage capacitor. The storage capacitor supplies standby power to the microprocessor when the television...
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5406128 |
Multicircuit control apparatus and control method therefor
In a multicircuit control apparatus (10) including a mechanical main contact (125) and plural semiconductor switching devices such as triacs (13a, --, 13d) each connected in series to the main...
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5402008 |
Automatic backup battery connection
A method and apparatus are described for selectively activating a secondary power source, such as a backup battery, for an electronic device, such as dynamic RAM. A connector is described in...
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5397868 |
Transfer switch
A transfer switch mechanism is provided for operating the handles of a pair of circuit interrupters. The transfer switch mechanism has a lever arm movable between advanced and retracted positions,...
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5386147 |
Aerospace power control system for monitoring and reliably transferring power buses
An aerospace power control system switches an aerospace load from a faulty ac power bus to a good ac power bus of two or more ac power buses if the currently connected ac power bus is about to...
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5384747 |
Circuit for placing a memory device into low power mode
A circuit that allows an SRAM to automatically switch into low power mode before its power supply voltage input is brought to a lower voltage when the computer is turned off. The circuit includes a...
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5384792 |
Uninterruptible power supply
An uninterruptible power supply which is down-sized and lightened is provided. A utility line 1 is connected with a switch 8 and the switch 8 is connected with a rectifying circuit 2 and DC power...
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5373196 |
Combination static/dynamic inverter
A power converter provides an AC output selectively using power from either a battery source or an alternator. The power converter includes a static converter (100) that is connected to receive DC...
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5347164 |
Uninterruptible power supply having a 115V or 230V selectable AC output and power saving
A method and apparatus is described for providing uninterrupted DC and selectable AC power depending on the value of utility-supplied AC voltage range. In the AC 115 V output case, by means of...
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5334878 |
Inverter control for third rail head end power
A system provides dual power producing capability to a diesel locomotive. The diesel engine drives the power generating system on the locomotive when the locomotive is operating under normal...
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5332927 |
Power supply system for a telecommunication system
An auxiliary power supply system includes an internal combustion engine driving an alternator the output of which is rectified and supplied to DC bus lines across which a storage battery is...
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5311066 |
Universal phase match path generator for three-phase power
A method for the transferring of 3 phase, asynchronous AC power between a present source supplying power to a load and an alternative source to supply power to the load. The maximum phase...
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5289045 |
Uninterruptible power supply
An uninterruptible power supply provides internal connection to an auxiliary power to provide continuous device power without duplicating regulation and switching circuits. The power supply...
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5289044 |
Electronic system switchable between its primary circuit and standby circuit
A switching system of the present invention is formed of two identical units. e.g. printed circuit board, the primary and the backup units W & P. Each unit has a switching circuit 1 such that upon...
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5289046 |
Power converter with controller for switching between primary and battery power sources
A power converter, based on a modular architecture, in which a boost power factor correction circuit is provided as an input stage for both a primary power source and a battery power source. This...
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5280455 |
Voltage supply circuit for use in an integrated circuit
The invention relates to a voltage supply circuit used in a semiconductor integrated circuit wherein switching between voltages generated is carried out in dependency upon whether the circuit is in...
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