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| Number | Title | Issue Date |
| 8184416 | Inverter driver and lamp driver thereof An inverter driver controls an inverter that supplies driving voltages to a plurality of discharge lamps. The inverter driver senses the abnormal operation of the plurality of discharge lamps based on a plurality of first feedback voltages corresponding to the plura... | 05/22/2012 |
| 8149554 | Apparatus for fault tolerant digital inputs An input termination board for use with an industrial controller in a safety system is disclosed herein. The industrial controller may be populated with standard input modules according to the application. The termination board, in conjunction with the controller al... | 04/03/2012 |
| 8059377 | Protection device, protection method using the same, method for processing signal using the same, and method for detecting quantity of electricity using the same A protection device detects a temperature in a predetermined monitoring place in an electronic apparatus 3 to protect the electronic apparatus 3, and includes an oscillating circuit 20 for generating a clock signal Vck having a predetermined cyc... | 11/15/2011 |
| 7929266 | Electronic device operable to protect a power transistor when used in conjunction with a transformer An electronic device can be used with a system, such as an ignition system, that operates a relatively high voltage. The device can include a signal clamping control module that can include a signal reference module and a feedback control module. The signal referenc... | 04/19/2011 |
| 7916441 | Device for protecting electronic circuits against faults A protection device for protecting an electronic circuit against a fault is described. The electronic circuit includes an output stage for driving a load and a driving circuit for driving the output stage. The driving circuit is configured to produce a drive signal ... | 03/29/2011 |
| 7911754 | Detection of current leakage through opto-switches Apparatus for testing an opto-switch includes a first sense resistor coupled between a power source and an input of the opto-switch, and a second sense resistor coupled to an output of the opto-switch. A test circuit is coupled to sense a first current flowing throu... | 03/22/2011 |
| 7852609 | Electrical power strip An electrical power strip has a base, a power cord and a control module. The base has at least one primary receptacle and at least one secondary receptacle. The control module is connected to the power cord and has two power input terminals, at least one primary con... | 12/14/2010 |
| 7787228 | Switchgear control apparatus A switchgear control apparatus includes main contacts for first to third phases, operating mechanisms for activating the main contacts for the respective phases, voltage sensors for detecting phase voltages of a three-phase power source, and a contact closing contro... | 08/31/2010 |
| 7742267 | Circuit arrangement and method for detecting the state of a circuit protection element There is described circuit arrangement which comprises a protection element. A state of the protection element is determined in a simple and safe manner by means of a detection unit and a specification unit, in addition to an evaluation unit. ... | 06/22/2010 |
| 7701684 | Power supply apparatus and power supply system including the same addressing abnormality A power supply apparatus connected via a bus line to another power supply apparatus includes a voltage generation circuit generating a voltage, an abnormality detection circuit detecting an abnormality of the power supply apparatus including the abnormality detectio... | 04/20/2010 |
| 7656630 | Active protection device for protecting circuit against mechanical and electromagnetic attack For protecting a circuit (1) against a mechanical or electromagnetic attack, an active protection device attached to the circuit comprises: —at least one generator (13, 14) for generating a magnetic field, —at least one magnetic sensor S1, S... | 02/02/2010 |
| 7652859 | Intelligent electronic device with integrated pushbutton for use in power substation The present disclosure describes a new pushbutton incorporated into new circuit configurations of an improved intelligent electronic device (“IED”), for use in power substation control systems. The new pushbutton is non-mechanical and configured to control a bre... | 01/26/2010 |
| 7551416 | Power supply equipped with an independent overload protection mechanism A power supply equipped with an independent overload protection mechanism includes a control circuit and a transformation circuit that form multiple sets of combination circuits for transforming AC power to DC power. Each control circuit is connected to a protection... | 06/23/2009 |
| 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 |
| 7400066 | Apparatus and methods for UPS bypass monitoring and control Status of a bypass source of parallel-connected UPSs is determined from a load share when a loading of the parallel-connected UPSs meets a predetermined criterion. Status of a bypass source of the parallel-connected UPSs is determined from a bypass source voltage wh... | 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 |
| 7375941 | Protective relay capable of protection applications without protection settings The current differential relay operates without adjustable settings, and includes a phase current differential element with a predetermined threshold, responsive to local phase current values and remote phase current values, to detect three-phase faults and producin... | 05/20/2008 |
| 7365450 | Current cutoff circuit and electric steering wheel lock An electric cutoff circuit for preventing overheating of a load. The current shutoff circuit includes an FET connected to a motor circuit. A relay fault detection circuit is connected to the motor circuit to detect potential at the motor circuit. A CPU sends a contr... | 04/29/2008 |
| 7366773 | Alternative communications paths for data sent over power line carrier Extensions to the concept of using a power line carrier to convey a data record from the secondary side of a first transformer to a receiver in a power distribution substation include receiving the data record over a secondary data path in the event that the primary... | 04/29/2008 |
| 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 |
| 7343254 | Resolver digital converter In a resolver digital converter comprising a resolver, a resolver digital conversion part, and an excitation signal generation part, the resolver digital converter for inputting an excitation signal generated in the excitation signal generation part to the resolver ... | 03/11/2008 |
| 7327274 | Programmable panel schedule The programmable panel schedule is an apparatus for monitoring and modifying electrical circuits. The programmable panel schedule can eliminate the need to rely on paper schedules and permit a building engineer to instantly assess any monitored circuit for changes, ... | 02/05/2008 |
| 7301310 | Excitation controlled synchronous permanent magnet machine The present invention provides an apparatus and methods for providing constant voltage from a permanent magnet generator at varying prime mover speeds or under varying loads. A constant voltage permanent magnet generator includes a housing, a magnetized rotor, a pri... | 11/27/2007 |
| 7299143 | Method and apparatus for improving operational reliability during a loss of a phase voltage The present invention is directed to a method and apparatus for improving operational reliability during a loss of a phase voltage (LOV) in a multi-phase power system, wherein a voltage representative of the LOV phase is calculated. The representative voltage is use... | 11/20/2007 |
| 7290721 | Method and apparatus for measuring the temperature of a computer system and operating the cooling fans A method and apparatus for measuring the temperature of a computer system provides a first temperature sensor, positioned around or on a CPU, for sensing the temperature of the CPU or around the CPU. A first A/D converter is used to convert the temperature sensed by... | 11/06/2007 |
| 7283915 | Method and device of fault location The present invention relates to a method for location of a fault utilizing unsynchronized measurements of three phase voltages and currents acquired at the line terminals without synchronization. Phasors for symmetrical components of the measured quantities are det... | 10/16/2007 |
| 7253635 | Method for checking the electrical safety of a household appliance and corresponding household appliance A nominal setpoint value of the admissible power consumption of a household appliance is respectively set for each electrical component. The actual value of the current consumption of the household appliance is measured according to the electrical components used an... | 08/07/2007 |
| 7242562 | Fan protection method and apparatus The present invention discloses a fan protection apparatus and related method thereof. The fan protection apparatus has a control circuit and a counter. According to the fan protection method, the user can set the acceptable restart number and the special time for a... | 07/10/2007 |
| 7242114 | Thermostat device with line under frequency detection and load shedding capability A method for detecting line under frequency (LUF) events and initializing load shedding of loads located near the electrical disturbance without customer and utility intervention is disclosed. In one example embodiment, the LUF detection system measures the time per... | 07/10/2007 |
| 7242291 | Arc fault circuit interrupter test circuit and test board A tester for an arc fault circuit interrupter that can selectively simulate and apply electrical arc faults and nuisance loads to at least one device under test (DUT). The tester includes a power supply, a test controller, and test circuitry coupleable to a DUT. AC ... | 07/10/2007 |
| 7233469 | Components having actively controlled circuit elements Protection and filtering functions are provided for external circuits by internal circuits that use controlled elements. ... | 06/19/2007 |
| 7233465 | Ground fault detection system and method for inverter The present invention discloses a ground fault detection system and method for an inverter. The ground fault detection method for the inverter includes a reference value setting step for setting a reference value for estimating a ground fault current and a reference... | 06/19/2007 |
| 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 |
| 7199989 | Digital protection relay with time sync function In a digital protection relay with a time sync function, the sampling timing of which is specified based on a reference timing transmitted from a time signal generator to a time sync unit, with a determination value. The time sync unit includes a reception circuit t... | 04/03/2007 |
| 7196571 | Semiconductor integrated circuit device To save power consumption in a semiconductor integrated circuit 2A increased due to a leak current caused by a variation in a manufacturing process, temperature, and a power supply voltage. A semiconductor integrated circuit 2A, a leak current detectio... | 03/27/2007 |
| 7183774 | Method of detecting partial discharges and diagnostic system for electrical apparatus The invention provides a method of detecting partial discharges in an electrical appliance insulated in a receptacle and a system of diagnosing the state of the appliance using this method. With the help of an UHF antenna placed in the receptacle of the appliance, t... | 02/27/2007 |
| 7181650 | Fault tolerant data storage circuit A fault tolerant data storage circuit for an integrated circuit produces a specified initial output state with high probability even in the presence of abnormal start-up conditions affecting one or more signal inputs to the storage circuit. The storage circuit inclu... | 02/20/2007 |
| 7164243 | System and method for establishing motor efficiency during balanced or unbalanced operating conditions A system and method for establishing a plurality of operating parameters of a multiphase motor. The plurality of electrical parameters may be established from stator resistance data and electrical input data. The system and method may be used to decompose the electr... | 01/16/2007 |
| 7164238 | Energy savings device and method for a resistive and/or an inductive load and/or a capacitive load An energy savings device for an inductive, a resistive or a capacitive load, such as a fluorescent light fixture having a magnetic ballast or an electronic ballast, which is powered by an AC voltage waveform. The energy savings device includes a setting unit for set... | 01/16/2007 |
| 7154722 | Loop control for distribution systems The invention contemplates a technique for providing loop control on a faulted overhead or underground loop system, while preventing restored current from being fed or back fed into the fault. In particular, the invention provides a method, device, and system for re... | 12/26/2006 |
