Class 361/93.5 - Transformer and resistor sensors

Subclass of Class 361 - Electricity: electrical systems and devices
Definition: Subject matter including an inductively coupled device and
No. of patents: 38
Last issue date: 09/27/2011

Number	Title	Issue Date
8027135	Fault current limiter A fault current limiter (FCL) includes a series of high permeability posts (1) for collectively define a core for the FCL. A DC coil (2), for the purposes of saturating a portion of the high permeability posts (1), surrounds the complete structu...	09/27/2011
7561396	Apparatus for monitoring open state of the secondary terminals of a current transformer Disclosed herein is an apparatus for connection to the secondary terminals of a CT to prevent CT damage and electric shock when the secondary terminals are opened, by providing an input signal and operating a relay circuit to short the CT secondary terminals. The ap...	07/14/2009
7233464	Apparatus for and method of ground fault detection A ground fault detection system is provided where one current sensor is used to calibrate a second sensor in order to provide automatic zeroing of the difference measurement. The calibration is done gradually in order to differentiate between sensor drift and a tran...	06/19/2007
7227729	Arc fault detection technique An apparatus and a method of detecting arc faults that have reduced susceptibility to nuisance tripping. The apparatus includes a current sensor, a differential current input sense circuit, a differential current (di/dt) characteristics sense circuit, an absolute cu...	06/05/2007
7218496	Overcurrent protection circuit The voltage generator circuit includes a regulator, a first sensor circuit, and a second sensor circuit. The first sensor circuit includes a first transistor, a first resistor, and an error amplifier. When V1>Vth, the error amplifier senses an overcurrent con...	05/15/2007
7184252	Surge protector with input transformer A surge protector for alternating current service includes at least an incoming hot line and a neutral line, but usually includes an incoming hot line, an incoming neutral line and a safety ground line. The surge protector has an input transformer and a series conne...	02/27/2007
7174261	Power line sensors and systems incorporating same An apparatus for sensing the current in a power line of a power system and systems incorporating the apparatus are disclosed. The apparatus may comprise an enclosure providing a window operable to permit the passage of the power line therethrough. The apparatus may ...	02/06/2007
7170732	Surge delay for current limiter A surge current delay time period is added to a current limit delay time period in order to permit a longer time for a possibly temporary larger-than-steady-state electrical current, such as for a start-up power requirement. A system is described for permitting a le...	01/30/2007
7161783	Overcurrent protection circuit for switching power supply In an overcurrent protection circuit for a switching power supply having multiple voltage supply sections, an overcurrent in a low voltage supply section is detected to make it possible to take a countermeasure against overload in a transformer winding, using a simp...	01/09/2007
7136269	Inverted circuit overcurrent protection device and hybrid integrated circuit device with the same incorporated An inverter circuit overcurrent protection device in which an overcurrent detection resistor (Rs) is incorporated in a hybrid integrated circuit, in which a detection voltage from the overcurrent detection resistor (Rs) is divided by voltage dividing resistors (R	11/14/2006
7116537	Surge current prevention circuit and DC power supply A surge current prevention circuit and DC power supply for preventing surge current in various operation applications with a small circuit configuration. A power switch connects an external power supply and a load. A first PMOS transistor is connected to a constant ...	10/03/2006
7085115	Non-ferrous surge biasing coil having multiple pairs of coils positioned at angles to one another A surge suppression device includes a first and second coil positioned in close proximity to one another such that the windings of each coil are disposed at an angle thereto. In a preferred embodiment, the coils are disposed such that the windings of each coil are p...	08/01/2006
7068487	Surge protector A surge protector for alternating current service includes at least an incoming hot line and a neutral line, but usually includes an incoming hot line, an incoming neutral line and a safety ground line. The surge protector has a series connected transformer with inp...	06/27/2006
7064946	Electronic fuse An electronic fuse comprising an integrated circuit having a control output terminal coupled to a control electrode of a power semiconductor switching device, the power semiconductor switching device being coupled in series with a load between first and second poten...	06/20/2006
6646848	Switching power supply apparatus An overcurrent protection circuit of a switching power supply apparatus, wherein a rectangular wave voltage is formed from an input voltage by the ON/OFF operation switching means, and an output voltage is formed by smoothing the rectangular wave voltage ...	11/11/2003
6633471	Overcurrent protection circuit, electric leakage protection circuit for an electric apparatus An overcurrent/leakage protection circuit installed in an electric socket or the like for over current/electric leakage protection, which includes a relay, a SCR (silicon controlled rectifier) which controls the relay, a trigger circuit which triggers the...	10/14/2003
6201678	High-voltage switch gear protection circuit A switch gear protection circuit for use in electric vehicles provides parallel circuit pathways for selectively coupling a power source to a capacitive load. A first pathway includes a main switch element that preferably is a high-current contactor or a ...	03/13/2001
6141197	Smart residential circuit breaker A circuit interrupter of the type including an electronic trip unit for overcurrent determination includes a separate circuit to power the trip unit along with a Hall Effect or GMR Device to sense the current flow within the protected circuit. A removable...	10/31/2000
6104583	Overcurrent protection systems An overcurrent protection system containing (1) a current sensing means; (2) a first switch coupled to the current sensing means; (3) a voltage sensing means; (4) a PTC device; and (5) a second switch coupled to the voltage sensing means. In one type of s...	08/15/2000
5959818	Method and apparatus for self-powered three-phase sensing to determine true RMS current values with separate burdens for each current transformer A method and apparatus is disclosed for three phase sensing of a polyphase distribution system to provide true RMS signal monitoring capabilities. Each current transformer is provided with a rectifier and a separate burden to not only provide accurate sig...	09/28/1999
5923514	Electronic trip circuit breaker with CMR current sensor A current sensor has a closed loop magnetic hoop with a gap and a central aperture for receiving a conductor. An IC chip incorporating a Giant MagnetiResistive (GMR) sensor is positioned in the gap to provide a measure of the current in the conductor. A r...	07/13/1999
5729421	Circuit analyzing system A circuit analyzing system includes a current transformer for extracting current from a phase or neutral conductor of a three phase line, a filter connected to the output of the current transformer and functioning to substantially trap current at the fund...	03/17/1998
5726849	Input overcurrent suppression circuit An input overcurent suppression circuit is used for a DC-DC converter in uninterruptible power supply source and includes a plurality of DC-DC converters, an AC-DC converter and a detecting means for detecting an input current to the DC-DC converters. In ...	03/10/1998
5574320	Load drive circuit The invention relates to a load drive circuit which is able to detect an "on" fault of a switch element for controlling power to a load, and reliably interrupt the load current. A monitoring sensor is provided which generates an output when energy is supp...	11/12/1996
5475371	Faulted circuit detector having isolated indicator A faulted circuit detector having an electrically isolated and remotely positioned indicator detects fault currents in a monitored conductor. When a fault of a predetermined magnitude is detected, a light pulse is transmitted from the detector to the indi...	12/12/1995
5436785	Electronic trip device comprising an earth protection An electronic trip device comprising, for each phase or neutral line, a rectifier bridge formed by four diodes which rectify the transformer current, a resistance for measuring the rectified current, and a circuit for detecting the sign or polarity of the...	07/25/1995
5124875	Overcurrent protection apparatus A current of an alternating current electric line is detected by a current transformer, the output of the current transformer is rectified by a rectifier, a series connection of a switching means and a resistor is coupled across the output terminals of th...	06/23/1992
5047890	Differential current protection circuits A differential protection circuit includes a pair of current transformers each having a secondary winding and each being inductively coupled to a power conductor at a different location. The secondary windings of these transformers are electrically connec...	09/10/1991
4876622	Circuit breaker warning relay and control accessory A circuit breaker warning and control relay provides visual indication of an impending overcurrent condition. Sufficient time is thereby allotted for manual intervention to prevent damage to material and equipment utilized within sensitive manufacturing p...	10/24/1989
4876625	Composite circuit breaker system A composite circuit breaker includes a plurality of circuit breaker modules inserted in paralleled branches of the main conductor. The branch phase currents associated with each breaker module and a signal representative of the total currents in the main ...	10/24/1989
4860153	Current sensing device A current sensing device comprises a constant d.c. voltage power supply circuit which is fed with a current flowing in one direction and outputs a positive potential, a medium potential and a negative potential at a positive output terminal, a medium outp...	08/22/1989
4849848	Circuit breaker A circuit breaker in which the levels of overload currents are detected with increased accuracy and which functions properly even just often its load-connecting contacts are closed. A rectifier circuit converts outputs from current transformers into curre...	07/18/1989
4733319	High-speed current limiting circuit breaker A high-speed current limiting circuit breaker comprises a self-recovery type current limiting element for limiting a fault current, a parallel resistance connected in parallel with the self-recovery type current limiting element and a circuit breaker conn...	03/22/1988
4532571	Circuit breaker A circuit breaker with a high linearity is provided which detects a current in a main circuit in a low current region by means of a current transformer, while the current in a high current region is detected by a current detector using a Hall element....	07/30/1985
4393431	Overcurrent relay circuit An overcurrent relay circuit has a power supply developed from a test signal representative of the current in the line being monitored. The power supply is a Zener diode and capacitor arrangement connected in series with the load or test resistor. A varia...	07/12/1983
4297741	Rate sensing instantaneous trip mode network Air core current transformers respectively linked with the phase conductors of a power distribution circuit develop secondary voltage signals proportional to the rates of change of the phase currents. A full-wave rectifying network provides a rectified ou...	10/27/1981
4131929	Bridge circuits for sensing currents in a three-phase A.C. circuit A bridge circuit including an eight-leg full wave rectifier bridge connected to rectify the phase and neutral currents produced by three wye-connected current transformers magnetically coupled to respective phases of a three-phase electric power circuit, ...	12/26/1978
4057842	Current regulation system for three-phase load The load currents, supplied by a three-phase AC power source to a three-phase load, are established and maintained at a preset desired level by sensing those currents and producing a feedback voltage which is compared with a reference potential. Anytime t...	11/08/1977

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Class 361/93.5 - Transformer and resistor sensors