Quotables
"The Americans have need of the telephone, but we do not. We have plenty of messenger boys."
Sir William Preece, chief engineer, British Post Office ; 1878
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8039993 | High-voltage bus discharge with logarithmic self-protection Systems and methods for discharging a high-voltage bus coupled to a discharge circuit are provided. A method comprises obtaining a first voltage level of the high-voltage bus. The method further comprises determining a first discharge time based on the first voltage... | 10/18/2011 |
| 7843086 | Power grid filter choke The object of the invention is to implement a circuit arrangement, which in rated operation without resonance generates as little power loss as possible, but on suitable excitation effects a disproportionate asymmetrical damping, so that resonances and overvoltages ... | 11/30/2010 |
| 7375443 | CPU surge reduction and protection Methods and systems of providing power to a central processing unit (CPU) provide for enhanced surge protection during CPU current consumption going from high current to low current consumption. In one approach, a circuit as a power output stage with an output node,... | 05/20/2008 |
| 7321834 | Method for calculating power flow solution of a power transmission network that includes interline power flow controller (IPFC) Power flow models of Interline Power Flow Controllers (IPFC) for large-scale power systems are studied, in details. Mathematical models of the IPFC, using the d-q axis decompositions of control parameters are derived. In this framework, for each IPFC, only two contr... | 01/22/2008 |
| 7317301 | Auxiliary power supply An auxiliary power supply equipment for a high voltage installation includes a power source at ground potential, a load circuit at high potential, and a transmission link for coupling the power source to the load circuit. The power source includes a high frequency v... | 01/08/2008 |
| 7274547 | Electrical power supply system and a permanent magnet generator for such a system An electrical power supply system including an engine driven permanent magnet generator (11) operable to produce a variable voltage and high frequency output which is converted by a series train AC/AC conversion circuit (14) into a fixed voltage and re... | 09/25/2007 |
| 7274117 | Radio wall switch A radio wall switch that uses radio signals to control a load through a load circuit is disclosed. The radio wall switch is also configured group or bind electronic devices to operate collectively by responding to the same radio control signals. Preferably, the radi... | 09/25/2007 |
| 7235900 | Switching apparatus and method for varying a phase line impedance of an electric power transport line section The switching apparatus and method are provided for varying the impedance of a phase line of a segment of an electrical power line. The phase line includes n conductors electrically insulated from each other and short-circuited among each other at two ends of the se... | 06/26/2007 |
| 7173349 | Equipment and method for exchanging power, in shunt connection, with an electric power network, and use of such equipment Equipment for exchanging power, in shunt connection, with an electric power network. A reactive impedance element and a voltage source converter provide mutual connection in series. The power network has a nominal voltage of a fundamental frequency and a given phase... | 02/06/2007 |
| 7157812 | Apparatus and method for modifying a power flow in a section of an electric power line The invention concerns an apparatus and a method for modifying a power flux in an electrical transmission line section (6,8), each section including phase lines having n conductors (10,12) electrically insulated from one another and shorted at the ends... | 01/02/2007 |
| 7138846 | Field effect transistor switch circuit A field effect transistor switch circuit may include: (1) first, second, and third switch terminals; (2) a first field effect transistor, a pair of the main electrodes of which are connected respectively to the first switch terminal and the second swit... | 11/21/2006 |
| 7131324 | Partial stroke valve test apparatus This invention relates to an emergency valve shutdown system having an integrated test facility. The invention provides an apparatus for testing emergency shutdown valves in a process industry comprising: a valve having a plurality of limit switches each limit switc... | 11/07/2006 |
| 7123729 | Dual use of an integrated circuit pin and the switching of signals at said pin In a signal processing system with an IC having an intrinsic signal provided at a pin of the IC, a first operational function (de-emphasis) for the signal is provided at the pin, and further along in the signal flow path, a second operational function (variable atte... | 10/17/2006 |
| 7105952 | Distributed floating series active impendances for power transmission systems Floating electrically isolated active impedance modules are formed to attach to power transmission lines without breaking the lines such that the power line forms a secondary of the main transformer of the module. Each module includes an electrical energy storage de... | 09/12/2006 |
| 7065662 | Information handling system featuring a power-based current limiting circuit A method of implementing a power-based current limiting circuit in an information handling system includes providing a power supply having an output voltage operating range that can vary between a first voltage output level and a second voltage output level. The pow... | 06/20/2006 |
| 7032986 | Self-calibration of power delivery control to firing resistors A fluid ejection device having an internal power supply path and a power regulator providing an offset voltage from the internal power supply path voltage. A self-calibration circuit in the inkjet printhead determines a regulation band of the power regulator defined... | 04/25/2006 |
| 6973153 | Transmit and receive protection circuit A transmit and receive protection circuit for use in a communication system is disclosed. The protection circuit uses a four-diode gate in which the currents through an input portion and an output portion of the diode gate are individually controlled by resistors lo... | 12/06/2005 |
| 6970123 | Inductorless architecture for a switching amplifier A switching circuit for generating first and second output signals for differentially driving a load is described. The switching circuit is operable to enforce a minimum pulse width on each of the first and second output signals. The second output signal substantial... | 11/29/2005 |
| 6879062 | Electrical substation A substation is disclosed for use in a power transmission and distribution network. The substation comprises a single phase isolating high frequency transformer having at least one input winding and at least one output winding with corresponding input and output sol... | 04/12/2005 |
| 6768227 | Digital controlled power regulation device A power regulation device is connected between a power source and a load for receiving receive first voltage from the power source and providing a second voltage to the load. The power regulation device includes a first voltage detection circuit for detecting the fi... | 07/27/2004 |
| 6747373 | System and method for coordinated control of a switched power capacitor with an integrated resonance protection system System and methods for coordinating the control system of a switched power capacitor with an integrated resonance protection function. The coordination system coordinates the function of a switched power capacitor's primary control system and resonance protection sy... | 06/08/2004 |
| 6486569 | Power flow management in an electric power grid Power flow management is achieved in an electrical power transmission network using serial impedance modulation distributed throughout the transmission lines of the network. Switching units are mounted to insulated portions of transmission line towers in ... | 11/26/2002 |
| 6424058 | Testable on-chip capacity The invention relates to a testable on-chip capacitor cell 10 including a decoupling capacitor (Ci) which can be disconnected from the power distribution network and discharged through a cell internal discharge circuit. An externally controllab... | 07/23/2002 |
| 6256385 | Power supply adapter circuit An adapter circuit PSA includes a comparator module OA, and a regulation module RM for normally adjusting the value of an output voltage Vout intended to be applied to an external circuit to a predetermined nominal regulation value Vreg0. In response to a... | 07/03/2001 |
| 6205500 | System and method for electrically isolating a device from higher voltage devices An isolation system and method that electrically couples a device to a bus during cycles associated with or accessing the device, but otherwise isolates the device from the bus. The isolation system includes an isolation device coupled to the device and t... | 03/20/2001 |
| 6194924 | Multi-function controlled impedance output driver A multi-function output driver that may be used with at least two types of busses includes a multiplexer that shifts calibration bits to the pull-down transistors. This shifting changes which transistors of the transistor array are turned on when the pull... | 02/27/2001 |
| 6181113 | Harmonic resonance control and protection system for switched power factor control capacitor devices A method and system for preventing sustained resonance conditions in a power system involves measuring voltage and current samples on a conductor to which a plurality of controlled capacitors are operatively coupled. The measured voltage and/or current is... | 01/30/2001 |
| 6114885 | Integrated driver circuits having independently programmable pull-up and pull-down circuits therein which match load impedance Integrated driver circuits include a pull-up circuit having a first plurality of PMOS pull-up transistors therein which are selectively enabled by a first multi-bit impedance control signal. This first multi-bit impedance control signal is a function of a... | 09/05/2000 |
| 5987546 | Multiple long bus architecture having a non-terminal termination arrangement A computer system having an interconnection apparatus for connecting processors, peripherals and memories, the system including a plurality of electronic devices, and a multiple long bus structure with impedance elements disposed thereon for providing non... | 11/16/1999 |
| 5962932 | Power supply apparatus with circuit load sensor A power supply apparatus 10 with circuit load sensor provides an extension cord 20 having first and second ends extending from an enclosure 30. Within the enclosure, a power supply indicator circuit 40 lights an LED in response to the plug of the extensio... | 10/05/1999 |
| 5834860 | Controlled impedance transistor switch circuit An output driver circuit comprises a plurality of parallel pull up and pull down circuits each comprising at least one transistor switch switchable between on and off states and circuitry operable to maintain a desired resistance in the circuit when the t... | 11/10/1998 |
| 5770969 | Controllable decoupling capacitor A decoupling capacitor and protection circuit is provided that will assist the power supply network in stabilizing the voltage near circuits that demand short rapid transitions in electrical current. The protection circuit also significantly reduces the a... | 06/23/1998 |
| 5764925 | Multiple long bus architecture having a non-terminal termination arrangement A computer system having an interconnection apparatus for connecting processors, peripherals and memories, the system including a plurality of electronic devices, and a multiple long bus structure with impedance elements disposed thereon for providing non... | 06/09/1998 |
| 5677577 | Reducing energy variations in thermal inkjet printers In thermal inkjet printing, an energy source supplies voltage pulses to a set of resistors in a printhead. The resistors are not necessarily equal-valued. The subset of energized resistors changes from pulse to pulse as a function of the printable data. A... | 10/14/1997 |
| 5506457 | Electronic switch for decoupling capacitor An electronic switch circuit switches out bad decoupling capacitors on a high speed integrated circuit chip. The circuit comprises a control device that operates in the subthreshold or off device state to detect leakage in a decoupling capacitor. This con... | 04/09/1996 |
| 5466975 | Switched termination for bus tap-off line An arrangement for terminating a tap-off line (40) between a bus line (14) and a bi-directional signal driver (38). The arrangement includes a resistor (42) serially connected in the tap-off line and a controllable switch (44) connected across the resisto... | 11/14/1995 |
| 5461265 | High-frequency variable impedance circuit having improved linearity of operating characteristics A variable impedance element suitable for controlling a high-frequency signal is formed of a pair of FETs of identical conduction type, and functions to prevent variations in degree of channel opening of the FETs in response to positive and negative-going... | 10/24/1995 |
| 5420464 | RF voltage/current sensor apparatus An RF voltage/current sensor apparatus comprising a plurality of transmission lines coupled through resistive means to voltage sense circuitry. The voltage sense circuitry utilizes transistor technology thereby reducing the use of switching relays, transf... | 05/30/1995 |
| 5414709 | Circuit for generating a configuration signal for a network system A station of a ring network includes (1) a circuit for generating a configuration signal for connecting the station into the network and (2) a load circuit coupled to the first node and ground for receiving a DC component of the configuration signal. The ... | 05/09/1995 |
| 5391930 | Circuit breaker with parallel resistor A circuit breaker with a parallel resistor which fulfills with a simple structure incompatible requirements for a resistance circuit making contact with regard to maintenance of the dielectric strength and prearcing characteristic between electrodes. A re... | 02/21/1995 |
