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| Number | Title | Issue Date |
| 8098467 | Method for avoidance of inadvertent protective tripping as a result of measurement errors within a protection system for an HVDC transmission installation A method for avoiding undesired, measurement error-induced protective tripping within a protection system of an HVDC transmission system. State variables of components of the HVDC transmission system are detected by first measuring devices to obtain a first set of m... | 01/17/2012 |
| 8054599 | Apparatus, system, and method for detecting a power system component failure An apparatus, system, and method are disclosed for detecting a power system component failure. The invention includes detecting an amount of input power provided on a power supply side of a connector, where the connector is configured to connect a switching power su... | 11/08/2011 |
| 7898781 | Arc fault detection apparatus employing a comparator with a continuously variable threshold An arc fault detection apparatus that provides for better discrimination of electrical arcing events from nuisance loads. The arc fault detection apparatus includes an arcing sense circuit having a comparator circuit with a variable threshold voltage that varies con... | 03/01/2011 |
| 7719807 | Field replaceable module for protection circuitry Methods and apparatus for enabling internal circuitry associated with a device to be efficiently replaced in an operating environment for the device are disclosed. According to one aspect of the present invention, a device includes an enclosure that defines an inter... | 05/18/2010 |
| 7719808 | Power converters with operating efficiency monitoring for fault detection A power converter includes a controller and at least one output terminal for providing an output voltage and an output current to a load. The controller is configured for monitoring the output voltage and the output current and calculating an efficiency of the power... | 05/18/2010 |
| 7688560 | Overload protection method This invention relates to overload protection for a circuit driving a direct current (DC) load. The invention provides a method of generating an overload condition for an output module driving a load having a load current and a load voltage comprising the steps of: ... | 03/30/2010 |
| 7573688 | Methods and systems for high current semiconductor diode junction protection Protection methods and protection systems, for high current semiconductor devices with diode junctions, that detect the anomalies in the local temperature at small areas of the junction and protect the device from accelerated aging and premature catastrophic damage.... | 08/11/2009 |
| 7489487 | Multi-level power converter A multi-level power converter is disclosed. The converter includes a DC power source having N (N is an Integer more than two)-level voltage potentials, and a plurality of switching legs connected in parallel to the DC power source. The switching leg has switching el... | 02/10/2009 |
| 7443645 | Overcurrent detecting device An overcurrent detecting device for detecting an overcurrent in a load circuit for controlling ON/OFF of a load by using a semiconductor switch, includes a driver circuit that outputs a driving signal to the semiconductor switch, a reference voltage generating circu... | 10/28/2008 |
| 7403364 | Power system fault characterization using transformed values An apparatus can include a fault condition detector configured to detect a fault condition in an electrical system, a delta d-q power value generator configured to generate a delta d-q power value temporally corresponding to the detected fault condition, and a chara... | 07/22/2008 |
| 7400481 | Low cost arc fault detection technique Low cost apparatus and methods of detecting arc faults for better discriminating electrical events. The arc fault detection apparatus includes a current sensor, a di/dt input sense circuit, a dv/dt input sense circuit, and a processing unit. The current sensor monit... | 07/15/2008 |
| 7394259 | Method and system for detecting and isolating stray voltage A stray voltage detection and isolation system. The stray voltage detection portion of the system includes a water delivery system electrically isolated from an electrical transmission system of an electric utility. Meters measure an electrical characteristic betwee... | 07/01/2008 |
| 7385794 | Secondary battery protection device Device miniaturization is made possible by building a battery protection circuit in a microcomputer. A secondary battery protection device includes a voltage detection device that detects a voltage of a power supply circuit including a secondary battery, a current d... | 06/10/2008 |
| 7365584 | Slew-rate control apparatus and methods for a power transistor to reduce voltage transients during inductive flyback Apparatus and methods that reduce the amount of conducted/radiated emissions from a power switch (200) when a transistor (210) is switched OFF are disclosed. In addition, apparatus and methods that reduce the slew rate in a power switch when the power ... | 04/29/2008 |
| 7365589 | Bandgap reference circuit A bandgap reference circuit, taking two or more power supplies as the input power supply for outputting a reference voltage, includes a first reference circuit, a second reference circuit, a power selection circuit and a switch circuit. The first and second referenc... | 04/29/2008 |
| 7366623 | Method and apparatus for characterizing a load on a data line A method for characterizing a load on a data line includes the steps of: (A) Applying at least three successive voltages to the data line. Each respective odd-numbered successive voltage of the at least three successive voltages has substantially a first voltage val... | 04/29/2008 |
| 7345379 | Power converter with voltage and current fault setting A power converter includes a steady-state controller for outputting a first voltage command such that a detected power value matches a power command, a transient controller for outputting a second voltage command such that a voltage detected before the occurrence of... | 03/18/2008 |
| 7342761 | Apparatus and method for limiting application of electrical power to a load The application of electric power from a power source to a load is controlled by detecting the magnitude of electric current flowing to the load and producing a first signal level that is indicative of that magnitude. The first signal level is compared to a referenc... | 03/11/2008 |
| 7340035 | X-ray tube cathode overvoltage transient supression apparatus An imaging tube (30) includes multiple high voltage elements (64). A voltage-clamping device (70) is coupled between the high voltage elements (64) and prevents the occurrence of overvoltage transients in the minor insulation of an imagin... | 03/04/2008 |
| 7340437 | Circuit configuration and method for identifying error situations in interconnected systems The circuit configuration according to the invention comprises an electrical signal line loop, several partial systems connected thereto, which evaluate the state of the signal line loop, wherein a first selectable switching means is looped in between a first end of... | 03/04/2008 |
| 7337081 | Metering device with control functionality and method thereof A metering device of a power substation and method are provided for operating on a secondary analog waveform output by a transformer assembly receiving a primary waveform. The method includes stepping down the secondary waveform and generating a corresponding output... | 02/26/2008 |
| 7310049 | Status indicator A status indicator indicates an operating state, including an electrical malfunction, of an electrical load that is located and controlled from locations remote from a monitoring location. ... | 12/18/2007 |
| 7305038 | Peripheral device receiver detection in a high noise environment A peripheral device includes a data port having high and low impedance terminations, a transmitter having a data signal generator and a receiver detector. The data signal generator is electrically coupled to the low impedance termination of the data port when in a l... | 12/04/2007 |
| 7305225 | Radio signal receiver A motor vehicle entertainment system includes a radio receiver and a control unit. The control unit receives a first status signal indicative of whether or not a motor vehicle door has been unlocked and initiates the application of power to the radio receiver upon t... | 12/04/2007 |
| 7289331 | Interposable heat sink for adjacent memory modules A h9eat sink device for conventional memory modules, such as DIMMs, that is configured to be positioned between adjacent memory modules mounted in substantially parallel connectors on a printed circuit board. Each heat sink device includes thermally conductive first... | 10/30/2007 |
| 7286332 | Apparatus for protecting bicycle electrical components An electrical control apparatus comprises a current sensor and a current inhibiting circuit that inhibits current flow between first and second terminals of a bicycle dynamo when current sensed by the current sensor is below a selected value. ... | 10/23/2007 |
| 7280331 | Power reconnect and voltage control In one aspect, a power connect device receives ac line voltage and provides ac load voltage to a load device. In one embodiment, the power connect device includes: a connect panel, a transformer circuit, a high voltage relay, a rectifier, and a voltage protection ci... | 10/09/2007 |
| 7271507 | Process and system for controlling an electronic power component and data recording support comprising instructions for executing the process The process for controlling an electronic power component for piloting an opening and/or closure of this component. The piloting process includes a plurality of steps for controlling the application of a succession of different commutation voltages on a control elec... | 09/18/2007 |
| 7268992 | Power supply with disconnect fuse A power supply in which a feed voltage (Us) is guided through at least one longitudinal branch to at least one output, the at least one branch having a disconnect fuse formed as a controlled semiconductor switch (SW1) and a monitoring unit (UWE) be... | 09/11/2007 |
| 7259565 | Testing an electrical switchgear system There is provided a method of testing an electrical switchgear system. A node in the electrical switchgear system monitors a power line signal and controls a breaker based on the power line signal. The method includes applying an analog signal to the node, and recei... | 08/21/2007 |
| 7259947 | Phase control switching device Respective contact terminals in respective arc-suppressing spaces of respective breakers are opened at a voltage zero point of any phase of three phases, simultaneously among the three phases. If current breaking is carried out for the three phases at the same time,... | 08/21/2007 |
| 7254465 | No-break-power-transfer control system for variable frequency electrical power systems A method and apparatus for executing a no-break power transfer between an electrical power generator powered by an auxiliary power unit (APU) and an electrical power generator powered by an aircraft main engine. The method comprises sending a power transfer command,... | 08/07/2007 |
| 7248977 | Phasor transducer apparatus and system for protection, control, and management of electricity distribution systems A system for measuring the delivery of electrical energy from an energy supplier to a consumer through an electric circuit is disclosed. The system includes devices coupled with the network. Each device comprises a sensor, an analog to digital converter, a processor... | 07/24/2007 |
| 7245469 | DC backup power supply device and method for diagnosing the same A reliable uninterruptible DC power supply device. The DC backup power supply device includes an AC/DC converter, a DC/DC converter, voltage step-up/down choppers and a battery connected to a DC path of a main circuit connected with a load via a switch, and a microc... | 07/17/2007 |
| 7236340 | Gate control circuit for prevention of turn-off avalanche of power MOSFETs A switch in an inductive circuit is prevented from avalanche operation when the switch is turned off. By preventing avalanche, the associated EMI is reduced or eliminated. Switch avalanche can be prevented using an active component, such as a transistor, or a passiv... | 06/26/2007 |
| 7219022 | Methods and apparatus for detecting failure of an isolation device Apparatus for detecting failure of an isolation device includes a current sensor to sense current through the isolation device and a circuit responsive to the current sensor output signal and to an enable signal that controls the isolation device for providing an Ea... | 05/15/2007 |
| 7218500 | High-voltage generator and accelerator using same In a high-voltage generator including a CW circuit (high-voltage circuit), where the CW circuit generates a high voltage through booster circuits that are provided for boosting an input voltage and connected to one another in multiple stages, a conductive shielding ... | 05/15/2007 |
| 7205756 | Unbalanced current detection An unbalanced current detection circuit determines when a multi-phase, normally-balanced load is unbalanced. The detection circuit of the present invention includes a plurality of current-squaring circuits, each squaring a sensed current of one of the phases. A summ... | 04/17/2007 |
| 7203044 | Electronic apparatus and power supply control method There is provided an electronic apparatus including a first interface to which a first device is connectable, a second interface to which a second device is connectable, and a power supply control circuit that controls a current to be supplied to the first and secon... | 04/10/2007 |
| 7199588 | Method and system for determining the buffer action of a battery A method for determining the buffering effect of the battery (2) for providing a voltage (U) for a power supply system (4), in particular for a vehicle, is provided in order to identify serviceability of a battery as easily and reliably as possible, in... | 04/03/2007 |
