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7622823 |
Uninterruptible power supply with low leakage current
An uninterruptible power supply having a controllable leakage current is disclosed. The leakage current is controlled by adjusting a switching speed (i.e., dV/dt rate) of switches in the output...
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7608947 |
Back-up power supply systems
A back-up power supply system includes, in one embodiment, a threshold detector circuit; a first switching circuit for enabling access to a back-up power source, the first switching circuit...
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7589438 |
Source phase sensitive transfer method and apparatus
A method and apparatus for transferring AC electrical power to a load from a first power source to a second power source provides for a time delay in the transfer to avoid problems associated with...
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7545659 |
Method and apparatus for cycle error correction for a power converter device, such as an electronic power inverter
Cycle error correction is performed in an electronic power system to compensate for a difference between an AC grid side frequency and an AC load side frequency. The electronic power system can...
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7528504 |
Automatic power adapter
An electrical device for automatically combining two input power source supply circuits with either aligned or unaligned phases, into a single operational circuit, with an output load capacity...
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7459804 |
Static transfer switch device and method
Devices and methods for improved voltage source transfer switching. First and second voltage sources (primary and alternate) are connectable to a load via corresponding first and second switches,...
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7417337 |
Method and system for facilitating no-break power transfer
An improved method and system for facilitating no-break power transfer between an APU and a main engine includes determining a required APU speed for conducting power transfer based on various APU...
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7408272 |
Method and device for supplying electric energy power to an appliance
The invention concerns a portable device for electric power supply comprising: connection means ( 8 ) for connecting an appliance ( 1 ) to be powered; and a power supply circuit ( 6; 16 ) supplying...
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7400493 |
Circuit breaking link status detection and reporting circuit
Certain embodiments provide a circuit breaking link status and reporting system. The system includes a power source and a circuit breaking link in communication therewith. An electrical outlet is...
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7382064 |
Supply voltage identifier
A supply identifier takes precise decision on the range of the external supply to manage a proper internal supply to the core of the IC by controlling a regulator or a switch connected to external...
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7362009 |
Chain reaction control circuit for parallel power supply
A chain reaction control circuit for parallel power supply provides greater power without changing the design of the original power supply structure. It includes a control unit to receive a first...
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7282815 |
Method and circuit arrangement for minimizing interference in an electronic circuit
The method and circuit arrangement both minimize stray electromagnetic interference in an electronic circuit, in which symmetric measurement signals are evaluated. Both inputs (InP, InM) of an...
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7233081 |
Power-supply device
A power-supply device suppresses high harmonic waves, controls the flow of AC power, and minimizes adverse effects on a load that might otherwise be caused by a large surge of current into the load...
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7215040 |
Half-bridge converter with zero-voltage switching and snubber
A method and apparatus for digital power processing operating with zero-voltage switching, which enables zero-voltage switching under the condition that the frequencies are not constant, or the...
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7141892 |
Power supply method of a line interactive UPS and the line interactive UPS
A power supply method and apparatus of a line interactive UPS utilizes a bi-directional AC/AC power converter in association with the AC delta control concept. When the line voltage coupled to the...
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7116082 |
Synchronization controller for multiple pulsed alternator applications
A control concept for large pulsed power applications that use multiple pulsed alternators to generate high-energy current pulses. Pulsed alternators produce a large reaction torque during...
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7107162 |
Determining an operational limit of a power transmission line
In a method, computer program and system for determining an operational limit of a power transmission line, time-stamped current phasor information and voltage phasor information for a first end...
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7106607 |
Combined AC-DC to DC converter
The invention relates to a combined AC-DC to DC converter. The converter provides the option of coupling to an AC supply source with at least one phase and the further option of coupling to at...
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7038522 |
System and method for redundant power supply connection
A system for connecting a receiver to a redundant power supply. The power supply units are connected to the receiver by means of a pair of control switches, each being connected in series between...
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7023109 |
Uninterruptible power source apparatus
An uninterruptible power supply unit essentially includes: a DC power supply source 3 , a parallel converter 4 , and a series converter 6 that are individually connected in parallel to both...
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7015597 |
Power regulator for power inverter
A power inverter includes a regulator circuit that controls real and reactive power output by the inverter. The regulator measures real and reactive output power by calculating x-phasor components...
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6984900 |
Intelligent electrical switch
An electronic circuit for use with an exhaustible power source and load such as a light bulb, includes a microchip with an input that transmits a signal to the microchip when the load is activated...
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6956304 |
Integrated circuit and method for controlling a power supply thereof
Integrated circuit, which is supplied externally by a supply voltage, having at least one useful circuit and a power supply for the at least one useful circuit which comprises a plurality of power...
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6883056 |
IEEE 1394 apparatus capable of making power class coincide even at the change over of a power supply to be used
An IEEE 1394 apparatus is disclosed wherein, even when the used power supply is changed over, coincidence of a power class is maintained. A voltage detection unit determines whether or not the...
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6864600 |
Apparatus and method for providing multiple power supply voltages to an integrated circuit
There is disclosed an apparatus and method for providing multiple power supply voltages to an integrated circuit. In an integrated circuit of the type comprising at least two power supply domains...
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6781258 |
Cooling device of electronic apparatus
A control device of a cooling device controls a fan based on a desired temperature around a CPU set by a target value setting unit and a temperature detected by a temperature detecting unit, so...
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6747372 |
Distributed control method for multiple connected generators
An energy generation network according to the present disclosure includes energy generating elements organized in a tree structure of superior and inferior system levels, with control systems and a...
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6738269 |
Line linkage protective device for electricity generation equipment
A device includes a governor for controlling the frequency of the generator of a private power generation equipment, function generating means having a function characteristic for detecting the...
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6700222 |
Power transfer system
Solid state switching devices, such as power IGBT's, are used to switch a load from one AC generator to another. The switching is controlled to occur only when the phase and voltage of the two...
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6661207 |
Apparatus and method for protecting synchronous generators against off-nominal frequency deviation and alternating forces excitation
An apparatus and method for protecting synchronous generators against off-nominal frequency deviation and alternating forces excitation is provided. Particular application can be found with...
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6661118 |
Differential voltage limiter
A low cost differential voltage limiter circuit provides a feedback to regulate a voltage output of a voltage source. In one embodiment, the limiter circuit includes a transistor coupled to outputs...
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6650028 |
Dual isolated input power supply
An apparatus for providing power to electronic equipment having multiple power sources. The separate and distinct power sources drive corresponding primary circuits such that the power source...
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6628013 |
Redundant power subsystem
A system includes a first voltage regulator, a second voltage regulator, a third voltage regulator and a circuit. The first voltage regulator is coupled to receive power from a first power line,...
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6593671 |
Process and apparatus for supplying electric energy to the wiring of a motor vehicle
Process for electrically energizing a motor vehicle wiring circuit which has a battery, at least one electric consuming device and a fuel cell unit connected therein. The fuel cell unit is...
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6580311 |
Circuit configuration for supplying voltage to an integrated circuit via a pad
A circuit configuration for supplying voltage to an integrated circuit via a pad that is connected to the input of a Schmitt trigger on the integrated circuit. The pad is also provided for...
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6566769 |
Three phase flat cable inductance balancer
An inductance balancer is connected between a drive and a flat three phase power transmission cable employed to carry power to a remote load. The inductance balancer includes a first inductance...
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6545481 |
Power interruption detection
An AC power interruption detection system is provided which compares an AC signal with a phased AC reference signal to determine the presence or absence of an AC power signal. By comparing the AC...
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6535405 |
Power supply device having two AC power inputs
A power supply device having two AC power inputs includes a power unit that has first and second AC power inputs and a power output, a step-down and filter unit, a power regulator unit, and a...
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6525434 |
Binary demand switching circuit
A switching circuit useful in a binary demand feedback DC converter having multiple DC outputs which are all independently regulated using a binary on/off technique is disclosed. A comparator...
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6522513 |
Back-electromotive force protection circuit
A back-electromotive force protection circuit that is able to protect circuit components other than a hard disc against the back-electromotive force generated in the hard disc. A back-electromotive...
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6466627 |
Pulse signal transmitting circuit and subscriber's line terminal apparatus using the pulse signal transmitting circuit
A pulse signal transmitting circuit generates a pulse signal having an enhanced high-frequency component with a reduced power loss. A pulse signal is transmitted to a load circuit through a...
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6465912 |
Power transfer device
A power transfer device includes a first current transferring section connected between a first AC power source and a load, a second current transferring section with first and second switches...
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RE37876 |
Power supply switch reference circuitry
An apparatus and method for switching between two power supplies, a primary power supply and a secondary power supply. The present invention generates a first reference voltage using the voltage of...
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6462434 |
Power supply isolation circuit and method
A power system has a first power supply operatively connect in parallel to a second power supply. The output of the first power supply is connected to the input of a switching device, such as a...
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6456056 |
Interconnection protective device for generator set
The present invention provides a system interconnection protective device. A command for dropping a voltage is issued when the frequency change rate of a private generator set is positive, and a...
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6429546 |
Systems and methods for preventing islanding of grid-connected electrical power systems
A preferred embodiment of the electrical power system of the present invention includes a power conditioning unit which is configured to receive the DC electrical output signal to deliver an AC...
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6404075 |
Uninterruptible power generation system
A power delivery system including a primary power bus for transferring power to the facility from on-site generators, and a secondary power bus for transferring power to the facility from a...
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6348744 |
Integrated power management module
Disclosed is a power management system for a portable phone, for example, a cellular phone operating according to a specific mobile communications standard GSM. The power management system...
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6342737 |
Binary demand feedback DC/DC converter
A binary demand feedback DC converter having multiple DC outputs which are all independently regulated using a binary on/off technique is disclosed. A comparator associated with each output...
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6331798 |
Control arrangement and method for high-speed source-transfer switching system
A control arrangement and method is provided for a power electronic system configured as a high-speed source-transfer switching systems (HSSTSS). The HSSTSS supplies an electrical load with...
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