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5278454 |
Emergency capacitive energy source and circuit for damper motors and actuator motors
The emergency, fail safe capacitive energy source and circuit is used in conjunction with an air damper actuator or a valve actuator. In particular, the capacitive energy source and circuit powers...
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5268850 |
Automatic power-failure and auxiliary generator control
The disclosed emergency control links an auxiliary electrical generator having an auto-start mechanism and an outlet socket, with a utility's power distribution socket, to maintain electrical power...
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5264732 |
A.C. electrical power supply system with a back-up power supply
An auxiliary generator supplies a sinusoidal voltage of fixed amplitude adjusted in phase to the mains supply voltage. A comparator, followed by a threshold circuit and a bistable switch, enables a...
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5258901 |
Holdover circuit for AC-to-DC converters
Holdover circuitry for an off line switcher, including a DC-to-DC converter, maximizes holdover time, during source voltage failures, by commutating a precharged holdover capacitor to the input of...
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5247205 |
Power supply apparatus
A power supply apparatus for supplying a direct current to a load includes a circuit breaker, and an AC/DC converter for converting an alternating current passed through the circuit breaker into a...
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5243577 |
Electronic apparatus
An electronic apparatus is provided with a main battery, semiconductor memories having a chip select input (active low), a backup battery, a pull-up resistor, a control unit for selecting one of...
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5241217 |
UPS with input commutation between AC and DC sources of power
An uninterruptible power supply is disclosed which is cheaper and more adaptable to various utility service inputs than presently available power supplies. A storage capacitor is placed between a...
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5233230 |
Power cord
An electrical power cord for connecting an a.c. current source to an appliance, and a d.c. current battery power pack connected to the power cord to replace a.c. current when there is a loss of...
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5229650 |
Uniterruptible power system
There is disclosed an improved uninterruptible power system used as a back-up power supply for a computer or communication equipment. The system comprises a rectifier for rectifying AC power from a...
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5223748 |
Battery manager
Battery monitor (100) with a transient pull down (172) for backup batteries which is active during power up and prevents the feedthrough charging of low or dead batteries causing a spurious power...
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5216286 |
Uninterrupted power conditioner circuit
A conditioning circuit for providing a reliable source of supply power has a source of interruptible power, a source of uninterruptible power, a first voltage limiting circuit supplied with power...
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5210685 |
Uninterruptible power supply system and load transfer static switch for such a system
A UPS system which operates initially in a commutation mode allowing commutation of the static transfer switch provided on the primary supply lines, and wherein the standby source is kept energized...
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5200586 |
Five gear isolating mechanism for bypass isolation switches
A mechanism for bypass isolation switches of the type comprised of at least three circuit interruption devices each having a handle has at least three switch gears, one positioned over each circuit...
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5198698 |
Auxiliary power supply system for providing DC power on demand
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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5191229 |
Power source transferring
A circuit (10) for transferring power delivered to a load (16) from a primary voltage source (12) to a secondary power source (14) uses three transistors (32, 40, 46) which switch whenever there is...
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5187382 |
Apparatus for detecting the existence of an abnormality in a vehicle operator protection system
A vehicle operator protection system capable of detecting abnormalities in an auxiliary power supply in the protection system. The auxiliary power supply comprises a backup capacitor which is part...
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5185536 |
Uninterruptible power supply having improved battery charger
An UPS apparatus with a back-up battery and successively coupled rectifier, inverter and output filter circuits, having an improved battery charging circuit. The charging circuit has a transformer...
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5184025 |
Computer-controlled uninterruptible power supply
A computer-controlled, uninterruptible power supply system is disclosed. The system selectively operates from more than one input source of power, e.g. an AC line input, an external DC input and...
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5182464 |
High speed transfer switch
A high speed transfer switch is provided for transferring a multiphase load among a number of multiphase A.C. power sources. If the initially selected source deviates from desired limits, the...
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5172292 |
Apparatus for protecting electronic equipment powered from a marine power source
A device and method for protecting D.C. powered electronic equipment to be isolated from a D.C. marine power source for minimizing the interference of extraneous signals on the power signals along...
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5170070 |
Switching power supply and adapter for switching power supply
A switching power supply which detects a power failure within a short period and maintains the DC output voltage (V O ) for a long time. The switching power supply comprises a first voltage control...
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5170109 |
Method of controlling robot in event of a power failure
Disclosed is a method of controlling a robot, for restarting the robot by resupplying an electric power in the event of a power failure. When a power failure detection circuit detects that a...
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5168171 |
Enclosure for circuit modules
An enclosure is provided for circuit modules which are mounted as an array in a vertical orientation within a card cage and which are electrically coupled to a back plane positioned rearwardly...
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5162623 |
Elevator monitor and control system with multiple power sources
An elevator monitor and control system includes at least one elevator control apparatus, a monitor panel, and a power line interconnecting the elevator control apparatus and the monitor panel. The...
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5162664 |
Communications arrangement for an electronic circuit breaker trip system
A circuit arrangement is used to interface a fault-powered circuit breaker trip unit to a communication network. The circuit arrangement includes a diode protected line which draws power from the...
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5142163 |
High speed load transfer system
A high speed load transfer system for use with critical loads, e.g. computers, includes a high speed transfer logic circuit which has rapid sensing and rapid contactor energizing means; so that in...
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5138184 |
Solid state static power transfer mechanism
A solid state, static power supply control mechanism for coordinated transfer of a load from a preferred source of AC power to an alternate source of AC power should the level of power transmitted...
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5138185 |
Electrical backup interface device having low power output
A portable module that provides an interface between alternating current wall outlets and appliances for the purpose of maintaining an appliance in a quiescent state for a preselected period of...
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5130883 |
Circuit for overvoltage protection
In a circuit for overvoltage protection of a low voltage device (11) arranged to control a load (12) an energy storage capacitor (17) is connected to charge from supply (+V) while the device is...
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5127464 |
Thermostat providing electrical isolation therein between connected heating and cooling transformers
A low voltage space thermostat adaptable for controlling a heating-only apparatus or a heating and cooling apparatus. The thermostat includes a DC power supply and a voltage step-up transformer...
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5128552 |
System and method for power supply preservation in a personal health monitor
A method and system for providing a reliable power supply for a personal health monitor that operates on power provided by a first power source or a second power source and that includes an...
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5120983 |
Device for starting automatically an auxiliary unit when switching on a main unit
In connection with an automatic starting feature for an auxiliary unit, preferably a vacuum cleaner, which is switched on simultaneously when a main unit, for example an electric hand tool, a...
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5118962 |
Power supply backup circuit
Improvements to a power supply backup circuit used to backup the operation of a radio device or the like when a power supply therefor is interrupted. A reverse current preventing diode is connected...
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5111059 |
Power transfer unit for transferring power supplied to a load between power sources responsive to detected SCR gate-cathode voltage
Switching of three phase wye power can be efficiently completed without synchronization between two or more energy sources. The absence of synchronism can be overcome by switching one source off...
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5103157 |
Common emitter amplifiers operating from a multiplicity of power supplies
A technique for operating a common emitter circuit from a plurality of supply voltages. In one embodiment, a current mirror includes a plurality of diode-connected transistors each connected...
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5092051 |
Absolute-measuring position transducer system for industrial robot
An asbolute position-measuring transducer system for an industrial robot having a plurality of axes of movement comprises an individual position transducer in the form of a resolver for each one of...
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5086235 |
Power supply switchover device for electrical apparatus and teleaction terminal equipped therewith
A power supply switchover device is provided for electrical apparatus such as teleaction terminal equipment. A switching circuit puts a storage battery into and out of use by connecting it to at...
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5081444 |
Automotive vehicle test equipment with anti-tamper device
An anti-tamper device in an automotive vehicle test system monitors an access panel to the automotive vehicle test system. An alarm is actuated if the access panel is opened. The automotive vehicle...
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5081367 |
Electric power system with maintenance bypass for uninterruptible power supply using closed transition operation
An uninterruptible power source having a static transfer switch which switches rapidly between a commercial power source and an alternate power source is removed from service by a maintenance...
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5070252 |
Automatic transfer switch
An automatic transfer switch having two sets of phase switches, one set for connection between a normal source of power and a load, and the other set for connection between an emergency power...
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5058075 |
Battery circuit for an integrated circuit (IC) memory card
A battery circuit incorporated in an integrated circuit (IC) memory card includes a power control circuit having a power output for connection to a power input of a memory chip of the IC memory...
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5057697 |
DC uninterrupted power supply having instantaneous switching followed by low impedance switching
An uniterruptible power supply is provided that incorporates switching ciitry permitting a path for instantaneous DC backup power to be supplied to a voltage-declining primary power supply bus....
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5055703 |
Load protection circuit
A battery operated standby inverter power supply uses an electromechanical relay switching network to connect and disconnect line power between input and output terminals. An overcurrent relay...
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5029285 |
Power back feed protection device
In a backup power supply, a pair of back-to-back auxiliary transformers are used to isolate the inverter control source, the inverter, and the a.c. line. A single-pole double-throw relay is used to...
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5023468 |
Safety device for car passengers
A safety device for a vehicle occupant comprising a restraint for the vehicle occupant, a sensing circuit for evaluating a vehicle condition, a control circuit for actuating the restraint in...
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5023469 |
Interlock system for bypass/isolation automatic transfer switch
A simplified mechanical and electromechanical interlock system connecting automatic transfer and bypass/isolation switches in a bypass/isolation automatic transfer switch is provided, whereby the...
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5012121 |
Electrical power supply for short term power interruptions
A direct current power supply for instantaneously providing tens of kilows of electrical energy for brief periods, such as 100 ms, during momentary power interruptions between a load and an...
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4982149 |
Electric supply apparatus having means for correcting supply voltage fluctuations
Power supply equipment which comprises a power supply circuit (9) that supplies power to a load, a regulator circuit connected to the power supply circuit that regulates the output voltage of the...
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4968899 |
Clock signal switching device of an IC Card
When an IC card is attached to a terminal unit, a counter counts pulses of an external clock signal and a switching circuit outputs the external clock signal to an internal circuit in place of an...
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4965828 |
Non-volatile semiconductor memory with SCRAM hold cycle prior to SCRAM-to-E.sup.2 PROM backup transfer
A non-volatile memory system includes an SRAM and a backup store of E 2 PROMs. In the event of a short duration power interruption, the memory system enters a hold mode in which data maintenance...
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