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| Number | Title | Issue Date |
| 8107204 | Three-phase detection module An apparatus includes a first optocoupler and a control module. The first optocoupler selectively allows a first current to flow from a first one of a first pair of N power supply lines to a second one of the first pair. N is an integer greater than two. The N power... | 01/31/2012 |
| 7414820 | Protective apparatus A protective apparatus for protecting electric device connected to an AC circuit from being damaged at a time of misconnection between a live line and a neutral line thereof. The protective apparatus includes a detector, a controller, and an alarm. The detector is c... | 08/19/2008 |
| 7411768 | Low-loss rectifier with shoot-through current protection A transistor active bridge circuit (400) rectifies domestic AC mains (for example, 120V, 60 Hz) and/or foreign AC mains (for example, 230V, 50 Hz) with low power loss. The circuit includes first and second field effect transistors (102, 104) of a first... | 08/12/2008 |
| 7362157 | Circuit arrangement with a transistor having a reduced reverse current A circuit arrangement is disclosed herein having an input terminal configured to receive an input voltage, and an output terminal to provide an output voltage for a load. A first transistor with a load path and a control terminal is connected between the input termi... | 04/22/2008 |
| 7327122 | Battery heating circuit A battery delivers its rated capacity when the battery is below a temperature when the available battery capacity is limited. The battery includes a heating element, a temperature sensor, and a switch operatively connected to the heating element and temperature sens... | 02/05/2008 |
| 7293462 | Isolation of short-circuited sensor cells for high-reliability operation of sensor array A device comprising an array of sensors and a multiplicity of bus lines, each sensor being electrically connected to a respective bus line and comprising a respective multiplicity of groups of micromachined sensor cells, the sensor cell groups of a particular sensor... | 11/13/2007 |
| 7277782 | Control system and method for electric vehicle An electric traction vehicle is described herein which may be used to provide power to off-board electric power-consuming systems or devices. The electric traction vehicle may provide 250 kilowatts or more of three phase AC power to an off-board electric power consu... | 10/02/2007 |
| 7265959 | Solid state switch with quasi-predictive short circuit protection and thermal protection A protection circuit detects short circuit and/or current overload conditions based on one of a current level and a current change rate di/dt of a current through a load. A detection device uses an inductor to detect current change rate and a resistor to detect curr... | 09/04/2007 |
| 7242563 | Reverse phase control power switching circuit with overload protection In one embodiment of the invention, a reverse phase control power switching circuit for controlling the flow of current through a load from an AC source comprises a sensing bridge in series with the load and the AC source. The conductive state of the sensing bridge ... | 07/10/2007 |
| 7196886 | Reverse wiring detect in circuit interrupting devices A resettable circuit interrupting device having a switch and timer circuit connected to the line side of the interrupting device to cause a leakage current to flow for a defined interval of time when power is applied. The timer and switch circuit comprises a timer p... | 03/27/2007 |
| 7143298 | Methods and apparatus for backing up a memory device A memory module for a computer-based system. The memory module includes at least one memory device that requires periodic refresh signals to maintain data and is mounted on the memory module, and a circuit mounted on the memory module and configured to retain data s... | 11/28/2006 |
| 7126801 | Polarity protection implemented with a MOSFET A polarity protection circuit contains a metal oxide semiconductor field effect transistor (FET) that pets its control voltage via an electrical connection from supply voltage lines and a transistor that pets its control voltage via another connection from the suppl... | 10/24/2006 |
| 6975490 | Apparatus and method for detecting phase state In an apparatus and a method for detecting a phase state capable of improving reliability of an air conditioner by preventing an abnormal operation of the air conditioner by detecting a phase state (antiphase and open-phase) of three phase AC power supplied to the a... | 12/13/2005 |
| 6909585 | Protection circuit protecting against voltage irregularities Protection circuits (1) to be located between power supplies (2) and further circuitries (20,30) for protecting further circuitries (20,30) against voltage irregularities and comprising main transistors (7) coupled to switching cir... | 06/21/2005 |
| 6720749 | Three-phase motor protector apparatus A three-phase motor protector uses two toroids to monitor all three phases of a three-phase motor. Current and phase loss are monitored directly in phases A and B while the phase C current level is determined by analysis of the phase A and B relationship. Current is... | 04/13/2004 |
| 6654217 | Quick responding instantaneous trip system An assembly and method is provided for a tripping mechanism of an circuit breaker to limit the damage to a protected circuit breaker and other associated equipment such as enclosures, bus way, etc. from the high forces that result from high currents and p... | 11/25/2003 |
| 6573726 | Sensitive ground fault detection system for use in compensated electric power distribution networks A system for detecting ground faults in a compensated electric power distribution network includes the determination of zero sequence voltage (V0) and zero sequence current (I0) on a power line and calculating the zero sequence condu... | 06/03/2003 |
| 6147616 | Automatic power interruption and re-supply relay for an electric power line The present invention provides a digital automatic power interruption and re-supply relay for performing detection and comparing operation to inform a state of an accident with voice and numerals and automatically operating a connected relay to interrupt ... | 11/14/2000 |
| 5859530 | Process for determining the phase sequence in a three-phase network (rotary current network) In a first measurement step, the two test probes of a measurement apparatus are contacted with two of the three phase lines. The measurement apparatus determines the frequency of the three-phase voltage. In a subsequent second measurement step, one of the... | 01/12/1999 |
| 5796565 | Apparatus and method for starting and protecting a three-phase motor Apparatus for protecting and starting a three-phase motor uses the three-phase field rotation torque produced by three voltage coils, connected to a three-phase power supply, spaced 120 degrees apart from each other, acting on an aluminum disk having a li... | 08/18/1998 |
| 5764465 | Electronic circuit arrangement having polarity reversal protection A MOS field-effect transistor (T2) is provided in conjunction with transistors (T1 and T3) as polarity reversal protection in an electrical circuit arrangement (1). Polarity reversal protection of this type is realized by the drain-source path of the tran... | 06/09/1998 |
| 5519557 | Power supply polarity reversal protection circuit A power supply polarity reversal protection device includes a voltage controlled switching device, e.g. an N-channel MOSFET connected between the power supply output (e.g. a positive supply voltage) and the circuit to be powered by the supply, i.e. the lo... | 05/21/1996 |
| 5349489 | Integrated semiconductor circuit with polarity reversal protection An integrated semiconductor circuit for use in a low voltage (1.5-2 V) battery operated device is provided with a protection circuit against reverse connection of the battery. The protection circuit takes care that the substrate is always connected to one... | 09/20/1994 |
| 5337208 | In-line AC current limiter An AC current limiter, which is connected in series with a transmission line and which operates in two modes, a conductive mode and a protective mode, includes first and second transistors coupled in parallel with first and second diodes, respectively and... | 08/09/1994 |
| 5267117 | Electrical phase and amplitude fault detection and response system The present invention provides a simple, reliable, comprehensive electrical phase and amplitude fault detection and response system. The system includes means for detecting any of various electrical faults, such as impermissibly low voltage levels, imperm... | 11/30/1993 |
| 5184063 | Three phase reversal detection system A polyphase reversal detection and correction system which operates over a wide range of line frequencies and produces an automatic phase correction for maintaining proper phase sequence to a rotating device. The system includes a circuit arrangement for ... | 02/02/1993 |
| 5057963 | Opposite phase detecting device for alternating current electrical equipment An opposite phase detecting device for alternating current electrical equipments includes a zero cross circuit synchronizing positive half waves of first and second line voltages of a three-phase AC supply supplied to an AC electrical equipment and genera... | 10/15/1991 |
| 5047915 | Unrestricted frequency converter for unbalanced loads A current fed unrestricted frequency converter (UFC) for supplying power with balanced voltages to a three-phase unbalanced load generates two sets of existence functions for controlling the switching matrices of the UFC to generate positive and negative ... | 09/10/1991 |
| 4922368 | Method and apparatus for detecting and discriminating faults in transmission circuits Discriminating circuits are coupled to receive signals from a protected transmission circuit. Each discriminating circuit also receives from a direction detector signals indicating whether any fault which occurs is forward of, or reverse of, a predetermin... | 05/01/1990 |
| 4910628 | Terminal unit in information transmission system A terminal unit for use in an information transmission system disposed between an information transmission line in the information transmission system constituted of signal lines for transmitting a signal by conduction therethrough of a direct current hav... | 03/20/1990 |
| 4876624 | Apparatus for detecting unsymmetrical bipolar waveforms A predetermined unsymmetry of a bipolar waveform is detected by apparatus which includes a circuit which generates a pulse for each zero crossing of the waveform. Each zero crossing pulse triggers a first retriggerable one-shot for a first interval T... | 10/24/1989 |
| 4833460 | Phasing indicator An apparatus for visually indicating abnormal phase relationships between incoming or outgoing phases for a plural phase device, comprised of a plurality of light emitting means interconnected between phases by a logic circuit arrangement whereby the vari... | 05/23/1989 |
| 4724503 | Phase unbalance detector A reduced voltage starter for gradually starting a polyphase motor having an acceleration control circuit for gradually applying power to the motor and detector circuits for detecting various fault conditions for terminating power to the motor. A shorted ... | 02/09/1988 |
| 4698718 | Electronic reverse power relay An electronic protective relay which offers a very sensitive detection of a reverse power condition of a three-phase alternating current generator for the protection against generator motoring is disclosed. A current signal is generated from a current tra... | 10/06/1987 |
| 4674002 | Directional comparison blocking system An echo-keyed directional comparison blocking system for protecting an electrical power transmission path in a power system network against internal faults is disclosed. The system includes a terminal unit disposed at each end of the transmission path for... | 06/16/1987 |
| 4667264 | Apparatus for controlling the starting of a three phase load with its normal phase sequence An apparatus for controlling the starting of a three phase load in its normal phase sequence. The apparatus is connected to the load in a predefined manner and has input terminals for receiving three phase electric energy through external supply lines. Th... | 05/19/1987 |
| 4663579 | Interconnecting circuit for connecting one d.c. voltage source to another An interconnecting circuit for connecting a first d.c. source to a second d.c. source. The circuit includes a first conductive connection extending between one terminal of the first source and one terminal of the second source, the first conductive connec... | 05/05/1987 |
| 4659974 | Controlling electrical phase connections to a three-phase device A control circuit is connected between a three-phase power supply and a motor and ensures the correct application of phase signals to the motor, regardless of the way in which the control circuit is connected to the power supply. A first output signal of ... | 04/21/1987 |
| 4647838 | Phase controller A phase controller of a type consisting of two magnetic contact units, a phase shifting mechanism for a thermal relay, a biasing circuit, a control circuit and a delay circuit, whereby phase shifting by the phase shifting circuit and three-phase currents,... | 03/03/1987 |
| 4618807 | Reversing contactor for a three-phase motor This invention pertains to a three-phase reversing contactor with fixed-mounted contact parts serving the input and the output, and a connection by contact bridges from the input to the output. A common drive mechanism is provided for all the contact brid... | 10/21/1986 |
