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| Number | Title | Issue Date |
| 4315208 | Regulated power supply having its d.c. voltage source selectively supplemented by a d.c. to d.c. converter A transistorized power supply for providing a constant voltage to a load. A series regulator interposed between a d.c. input voltage source and the load to regulate the d.c. output voltage. A d.c. to d.c. converter serially connected between the d.c. inpu... | 02/09/1982 |
| 4311919 | Transfer logic control circuitry The inventive transfer logic controller provides a method and system for effecting three types of power transfer to a plant bus comprising a fast transfer, synchronous transfer and decay or residual voltage transfer.... | 01/19/1982 |
| 4310771 | Method for transferring power in a synchronous mode to a motor bus In a typical power system, a motor bus is fed by a main power system; and, an auxiliary system is provided to alternatively feed the motor bus. When a fast transfer from the main power to the auxiliary power system is desired, for example, in case of faul... | 01/12/1982 |
| 4295053 | Electric control system with mechanical interlock An electric control system with mechanical interlock characterized by means for switching between normal and emergency supply lines extending to a load which comprise two parallel paths extending to the load which paths include spaced controlled devices, ... | 10/13/1981 |
| 4288865 | Low-power battery backup circuit for semiconductor memory A battery backup circuit for an MOS memory which has a multiplexed pin (WE) that functions to provide backup power to a memory cell array (50) upon loss of primary power Vcc. A voltage comparator (10) detects when the primary power Vcc | 09/08/1981 |
| 4280330 | Vehicle heating and cooling system An air conditioning system primarily intended to be installed in an automative vehicle for selectively heating or cooling the passenger compartment for comfort as might be desired by the occupants. The system is completely battery operated and may be programme... | 07/28/1981 |
| 4254344 | Turbine start-up switch A prime mover which is equipped with an electric speed governor may produce adequate electrical power output through a shaft driven permanent magnet alternator to run the electric speed governor. However, initially an auxiliary power source must be connec... | 03/03/1981 |
| 4241261 | Circuit control to limit power drain of auxiliary power supply in UPS system An uninterruptible power supply includes a digital control circuit to control the transfer of power from a primary and a secondary power source to a load circuit to be energized. The digital control circuit controls through digital techniques the relative... | 12/23/1980 |
| 4231028 | Ready indicator for high-voltage switchgear A "ready" indicator for high-voltage switchgear. The switchgear contains switches having normal positions (opened or closed) and switch operators therefor. The switch operators may include stored energy devices which may be charged or uncharged. The switc... | 10/28/1980 |
| 4231029 | Automatic transfer control device and frequency monitor An automatic transfer control device for generating signals to cause associated circuit interrupters to selectively energize an electrical distribution system from either of a pair of electrical power sources. The device includes an over- and under-freque... | 10/28/1980 |
| 4227257 | Power supply circuit for an electronic tuning type receiver with a memory element Power is provided for maintaining the contents of the memory in a digital receiver by providing a second output terminal for driving the memory element when either the power switch is turned off or the main power supply is interrupted.... | 10/07/1980 |
| 4216385 | AC/DC Power supply device An AC/DC power supply device for operating a refrigerator compressor by switching over the AC operation mode in which the compressor is operated from AC power source and the DC operation mode in which the compressor is operated from DC power source throug... | 08/05/1980 |
| 4216525 | Truck marker light A marker or clearance light for semi trailers and the like which increases the life by a factor of from 3 to 10.... | 08/05/1980 |
| 4204249 | Data processing system power control The data processing system consists of a plurality of interconnected data processing subsystems one of which is a service subsystem devoted to servicing the remainder of the system and provides communication between the operator and the system to facilita... | 05/20/1980 |
| 4189649 | Control panel for automatic transfer switch A control panel, formed entirely of solid state components, for an automatic transfer switch which alternatively connects a load to a normal source of power or starts up an emergency source of power and connects the load to it. The control panel includes ... | 02/19/1980 |
| 4182110 | Electronic wristwatch including auxiliary power supply An electronic wristwatch including an auxiliary power supply for energizing at least the timekeeping circuit when the main power supply is being removed for replacement is provided. The wristwatch includes a high frequency time standard that vibrates at a... | 01/08/1980 |
| 4181842 | D.C. monitoring circuit A power supply structure for an electronic system includes a primary power source and a stand-by or secondary power source. The secondary power source is ground circuit isolated from the primary source. A monitoring circuit, which is energized from the se... | 01/01/1980 |
| 4180745 | Power regulating supply system for AC electrical loads Electrical line voltage energy from an AC power network is combined with the energy derived from an auxiliary DC voltage source through the primary winding of a transformer to operate an AC load under rated conditions normally associated with its operatio... | 12/25/1979 |
| 4177389 | Power supply system with two regulated power supply devices connected in parallel at an output A power supply system is disclosed having two regulated power supply devices with outputs connected in parallel for redundant half-load operation. Each power supply device has a voltage regulator and a current regulator with outputs connected in parallel ... | 12/04/1979 |
| 4160917 | Energy conserving transformer power supply system An energy conserving transformer power supply system comprising one main transformer of large capacity to carry the maximum load under normal occupancy hours and one auxiliary transformer of relatively very small capacity to carry the utmost minimum load ... | 07/10/1979 |
| 4157461 | Automatic transfer switch and bypass switch arrangement An arrangement including an automatic transfer switch, a bypass switch, and mutually cooperable pairs of contacts for electrically connecting the two switches. The entire transfer switch is movable as a unit toward and away from the bypass switch to engag... | 06/05/1979 |
| 4145618 | Arrangement for providing auxiliary energy source for static inverter used with traction motor drive during power interruption A high voltage power supply system for energizing a static inverter, in which an auxiliary circuit provides a source of reserve energy to sustain inverter operation during periods of power interruption. In the auxiliary circuit, there is provided a capaci... | 03/20/1979 |
| 4142172 | Emergency power pack for vehicle trailer lights A device provided with its own power supply to be hooked up to the lighting system on a vehicle trailer, such as semi-trailers, campers, mobile homes, and the like, for the purpose of flashing all or some trailer lights on and off while the trailer might ... | 02/27/1979 |
| 4131827 | Power transfer apparatus A power transfer apparatus transfers electrical energy from a DC voltage source that may vary in potential, e.g., a solar cell array, to a load such as a DC motor connected to drive an AC motor-generator. A power transfer device couples the solar cells to... | 12/26/1978 |
| 4128860 | Truck marker light A marker or clearance light for semi trailers and the like which increases the life by a factor of from 3 to 10.... | 12/05/1978 |
| 4122359 | Memory protection arrangement A memory protection arrangement includes a primary power supply unit and a back-up battery. The back-up battery supplies maintenance energy to the memory itself, the battery being automatically effective whenever the primary power supply voltage decays to... | 10/24/1978 |
| 4122516 | Inverter control apparatus An apparatus for controlling the operation of an inverter which converts DC power obtained by rectification of a received AC power or DC power received from a battery which is alternatively actuated in case of an AC power supply failure or the like, into ... | 10/24/1978 |
| 4115704 | Parametric energy coupled uninterruptible power supply A parametric energy coupling system for providing uninterruptible a-c power o electrical loads. In a normal mode, a parametric transformer couples a-c line power directly from an a-c power source to a load. Upon a power outage occurrence, an inverter is en... | 09/19/1978 |
| 4104539 | Parallel redundant and load sharing regulated AC system An electrical power system is provided having two power sources, one being a commercial power source and the other being an inverter. Both power sources are connected to the load so as to share the load, approximately equally. A voltage regulator is in se... | 08/01/1978 |
| 4104538 | Digitally synthesized back-up frequency A digitally synthesized frequency back-up circuit which, after removal or failure of applied A.C. power, will reproduce signals precisely indicative of each zero transition point of the A.C. waveform. A high frequency binary counter continually counts int... | 08/01/1978 |
| 4099692 | Transfer apparatus for energy sources First and second monitoring channel apparatus detect the level of the normal output and load current, respectively, supplied by a principal energy source to a variable load network. Source output varies from normal to low level and load current from low t... | 07/11/1978 |
| 4099372 | Timekeeping apparatus with power line dropout provisions In a timekeeping arrangement, including seconds, minutes and hours counters and associated display decoding circuitry, during temporary power line dropouts, the supply voltage for the hours and minutes counters is maintained by an associated voltage stora... | 07/11/1978 |
| 4096394 | Apparatus for supplying electrical energy to a load A main and an auxiliary energy supply device supply energy to a load normally and during disturbances of the main supply respectively while, for bridging brief disturbances in the load supply, for example naturally brief disturbances or during the short t... | 06/20/1978 |
| 4093909 | Method and apparatus for operating a semiconductor integrated circuit at minimum power requirements A method and apparatus for operating a smiconductor integrated circuit at minimum power from a voltage source, including deriving a semiconductor process parameter dependent reference voltage within the integrated circuit, comparing the magnitude of the r... | 06/06/1978 |
| 4081692 | Apparatus for supplementing commercial power subject to brownout and blackout failures A power source for supplementing commercial ac power in cases of sustained brownouts or blackouts is achieved with an alternator connected to augment the power of a commercial ac source, a first circuit for sensing the voltage level required of the altern... | 03/28/1978 |
| 4075502 | Monitoring device A monitoring device which is directed to achieving a more reliable power supply for an electronic or electromechanical system; such monitoring device including a means for selecting, in response to detection of subtle failures in either of two power suppl... | 02/21/1978 |
| 4075503 | Emergency lighting system An emergency lighting system including an inverter for operating a fluorescent lamp from a battery upon failure of the primary AC voltage source. A transformer connected to the AC source is provided with a single secondary winding for providing both curre... | 02/21/1978 |
| 4063108 | Inverter lockout circuit An emergency lighting system includes a switching transistor inverter circuit for starting and operating a fluorescent lamp from a battery upon failure of line voltage. A lockout arrangement serves to shut down inverter operation should the lamp be remove... | 12/13/1977 |
| 4056757 | Emergency lighting system A system which will provide emergency lighting as desired when the normal power supply such as the utility power is interrupted or otherwise not available. The system provides the emergency power by means of the same wiring that is used to provide the uti... | 11/01/1977 |
| 4042780 | Multiple message frame adaptor apparatus for loop communication system A serial data communication loop system includes single input-output controllers and/or dual message transmission with a novel adaptor unit for converting from a single to dual message frame and/or from a dual to single message frame. The message frames a... | 08/16/1977 |
