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| Number | Title | Issue Date |
| 8159086 | Methods and systems for no-break power transfer converter A method is provided for using a temporary power source to transfer a power bus from a first power source to a second power source. The first power source operates at a first electrical frequency, and the second power source operates at a second electrical frequency... | 04/17/2012 |
| 7701082 | Aerospace electrical power DC subsystem configuration using multi-functional DC/DC converter An apparatus for regulating voltage and aerospace electrical power systems are implemented. A multi-functional apparatus for regulating voltage, according to one embodiment, comprises: a DC to DC converter (315), wherein the DC to DC converter (315) is... | 04/20/2010 |
| 7420294 | Smart power switch for broadband communications network A power switching module provides power to a line amplifier in a broadband telecommunications network. The switch includes a first input port for connection to a first power source, a second input port for connection to a second power source, an input/output port fo... | 09/02/2008 |
| 7417336 | Combination current hysteresis and voltage hysteresis control for a power converter Consistent with an aspect of the present disclosure, a method is provided for controlling an AC signal, which is supplied to a load and selectively supplied to a utility grid. In response to a fault in the utility grid, the method includes decoupling the AC signal f... | 08/26/2008 |
| 7312720 | Multi-loop transmission system A transmission system between a voltage source and a wireline tool comprising a first loop to transmit a signal between the voltage source and the wireline tool. The first loop has a first transformer coupled to the voltage source. The system also comprises a second... | 12/25/2007 |
| 7294940 | Power over ethernet battery backup An apparatus, system, and method for providing DC battery backup power to Power over Ethernet, (PoE) Mid Span or End Point Power Sourcing Equipment, (PSE), such that in the event of the loss of utility power the PSE device is able to continue to provide power for so... | 11/13/2007 |
| 7250694 | Power-saving control module for an electrical appliance In a power-saving control module for an electrical appliance that includes a DC power supply and a remote control receiver, a switch component serves to make or break electrical connection between an AC power source and the DC power supply, a diode provides a path f... | 07/31/2007 |
| 7230819 | Mobile power system A mobile power system for producing power at a desired location includes a first power generating device of a first type coupled to a transportable housing, and a second power generating device of a second type coupled to the transportable housing. The first type of... | 06/12/2007 |
| 7212921 | System and method for multiplexing and transmitting DC power, IMU data and RF data on a single cable A system for providing connectivity to co-located instruments includes a processor for receiving and processing GPS data and IMU data, a GPS receiver antenna operable to supply the GPS data to the processor, and an IMU, co-located with the GPS receiver antenna, oper... | 05/01/2007 |
| 7190091 | Selectable source input power supply A selectable source input power supply is disclosed. According to one embodiment, a power supply is provided comprising an input stage including an input connector to couple the power supply to either of an AC input voltage or a DC input voltage, and an actuatable i... | 03/13/2007 |
| 7154412 | High-power well logging method and apparatus A power delivery system for a wireline tool includes two independent power transmission loops operating on a standard six-conductor cable. The two loops each connect directly to a respective terminals of a DC auxiliary power supply. Each loop also couples through a ... | 12/26/2006 |
| 7151326 | System and method for safely and efficiently capturing power currently produced by already available power supplies to power electrical devices in a truck while its engine is turned off The present invention is directed to an electrical system and method for providing power to a truck's cab while the truck's engine is turned off. An already available primary power supply of the truck and a secondary power supply generally located on a trailer being... | 12/19/2006 |
| 7145265 | AC/DC hybrid power system A hybrid power system has two voltage sources, a variable DC power source, and a second power source, connected through selection components to a common node. The variable DC power source may be a solar power source and the second source may be an AC grid. The selec... | 12/05/2006 |
| 7081735 | System and method for bypassing a motor drive A motor control system comprising a plurality of motor controllers and a power source adapted to drive an electric motor. The motor control system comprises a switch that is selectively operable between at least a first position and a second position. In the first p... | 07/25/2006 |
| 6037571 | Dual power high heat electric grill The invention is a dual power source high heat electrical grill whose primary application is as an outdoor or indoor grill which uses the combination of AC and DC powered elements in a hybrid configuration to produce as much heat as conventional outdoor g... | 03/14/2000 |
| 5878584 | Air conditioner with solar generator An air conditioner equipped with a solar generator is disclosed. The solar generator is capable of converting the DC power generated by a solar cell into the AC power whose voltage and frequency correspond to that of the commercial power source. The elect... | 03/09/1999 |
| 5608275 | Fault tolerant isolation between devices powered by separate power sources A fault tolerant isolation system providing fault tolerant electrical isolation between different components receiving power from separate power sources regardless of which of the power sources fails. One power source provides operating voltage to an isol... | 03/04/1997 |
| 5541458 | Power supply for timed residual power after turn off This invention relates to an improved laser printer power supply that maintains 24-, 12-, and 5 volt DC power to run exhaust fans for a brief period after the power switch is turned off. These fans remove undesirable ozone from the photo-conducting print ... | 07/30/1996 |
| 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. An energy backup and recovery system stores energy in a s... | 05/07/1996 |
| 5437040 | Electronic system with variable threshold power failure signaling A digital electronics system, such as a computer, includes circuits which provides signals proportional to the instantaneous voltage and current on the power bus to a microprocessor. The microprocessor uses these signals, the capacitance of the system fil... | 07/25/1995 |
| 5376828 | 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. An energy backup and recovery system stores energy in a s... | 12/27/1994 |
| 5283474 | Circuit for driving a load by using selectively one of two different DC power sources A circuit of a detection switch for generating an output signal for driving a load device in accordance with the detection result by a detector is composed with a reduced number of components externally attached to an IC substrate which mounts integrally ... | 02/01/1994 |
| 4841215 | D.C. solenoid control circuit A D.C. solenoid control circuit for use in mechanisms driven by an A.C. motor. A rectifier converts A.C. current to D.C. current and provides an A.C. current flow path and a D.C. current flow path. Only the motor is connected in the A.C. current flow path... | 06/20/1989 |
| 4794270 | Stabilizing circuit for switching mode power supply circuit A switching mode power supply circuit designed to apply an operating power to the load when a relay connected to the remote control part is driven. The switch of the relay is connected to the base of the switching transistor, and the secondary winding of ... | 12/27/1988 |
| 4608498 | Load control circuit with different input voltages A load control circuit having an input terminal adapted to receive any one of a number of different input voltage signals including signals of at least first and second type. These signals may be, respectively, DC and AC input signals. Control circuits ar... | 08/26/1986 |
| 4599519 | Superconducting magnetic energy storage for asynchronous electrical systems A superconducting magnetic energy storage coil connected in parallel between converters of two or more ac power systems provides load leveling and stability improvement to any or all of the ac systems. Control is provided to direct the charging and indepe... | 07/08/1986 |
| 4122512 | Superconductive energy storage for power systems Energy derived from an alternating current power system is stored in a superconducting magnet or inductor. The transfer of the energy is reversible so that the energy stored in the superconducting magnet can be returned to the alternating current power sy... | 10/24/1978 |
| 4070586 | Electric vacuum cleaning and agitator motor control system Electrical energization and control circuit particularly for use in permanently installed vacuum cleaning systems having a centrally located A.C. powered vacuum turbine and a remote flexible cleaning unit equipped with low voltage A.C. or D.C. agitator mo... | 01/24/1978 |
| 4020365 | Integrated field-effect transistor switch A monolithic switching circuit has a junction field-effect transistor controlled through a capacitive diode and a small field-effect transistor. The physical structure of the switch includes a junction field-effect transistor with a gate region connected ... | 04/26/1977 |
| 3939358 | Plural load lighting assembly energizable through two input terminals Two individual lamp loads are mounted on, are support by, and are electrically terminated within one plural lamp load housing assembly which has a single pair of electrical input terminals. An apparatus within said housing, which senses applied A-C electr... | 02/17/1976 |
