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| Number | Title | Issue Date |
| 5907462 | Gate coupled SCR for ESD protection circuits A protection device comprising a gate-coupled silicon-controlled rectifier (SCR) (100), SCR (100) comprises an anode (105) formed in n-well (104) and connected to a pad (128) and a cathode (111) connected to ground. A gate-coupled NMOS transistor (120) ha... | 05/25/1999 |
| 5801912 | Shock hazard protection system The present invention teaches a new and novel system for protecting people and property against electrical shock. The invention includes a number of preferred and other embodiments which have this as their goal, but which represent a number of distinctive... | 09/01/1998 |
| 5764467 | Apparatus for protecting switch-mode power supplies connected in parallel from overvoltage An apparatus for protecting switch-mode power supplies connected in parallel (SMPS) from overvoltage by ceasing operation of the load sharing circuit when voltage higher than a predetermined voltage level is applied to the load sharing pin. Under normal o... | 06/09/1998 |
| 5754384 | Overcurrent protection circuitry for non-isolated battery discharge controller An overcurrent protection circuit for protecting a boost-type non-isolated battery discharge controller from a fault current. The battery discharge controller includes multiple parallel-coupled power stages each having an input fuse and an output fuse hav... | 05/19/1998 |
| 5739999 | Current limiting circuit A current limiting circuit for use in broadband and combined broadband and telecommunications networks is described. A current limiting element is triggered into a high impedance state in the event of excess current on the line. A sensing element detects ... | 04/14/1998 |
| 5717557 | Low side line driver A low side line driver (10) includes a slew rate limiter (12) providing current to a pre-charge reference circuit (16). The pre-charge reference circuit (16) generates a constant voltage at the input of a pre-drive circuit (18). Upon a transition to the a... | 02/10/1998 |
| 5706160 | Transmission bandwidth extender/category 5 protector A surge protector module for protecting telecommunications equipment from power and transient surges includes a two-piece interfitting housing, a printed circuit board, a plurality of circuit surge protector devices mounted on the printed circuit board, a... | 01/06/1998 |
| 5699219 | Ground fault current limiter and method of limiting ground fault current A ground fault current limiter, in which reactors are connected in series to a neutral point for compensating for capacitances to ground of a power switches capable of turning ON/OFF at a high speed are connected in parallel with respective reactors, occu... | 12/16/1997 |
| 5694281 | Zero sequence voltage-polarized directional element for protective relays The directional element produces a quantity related to the zero sequence source impedance of the power system relative to the location of the directional element, from values of zero sequence current and an adjusted value of zero sequence voltage. The imp... | 12/02/1997 |
| 5694279 | Superconductive fault current limiters An inductive Superconductive Fault-Current Limiter (SCFCL) includes an iron core having a wound primary winding and a short-circuited superconductive secondary. The secondary remains superconductive up to a fault-current level in the primary, after which ... | 12/02/1997 |
| 5691869 | Low cost apparatus for detecting arcing faults and circuit breaker incorporating same A low cost analog arcing detector and a circuit breaker incorporating such a detector provide a variable response time to arcing faults based upon the amplitude of the arcing current. A filter generates pulses having an amplitude proportional to the ampli... | 11/25/1997 |
| 5687051 | Feedback circuit for protecting an integrated circuit with a delay time Circuitry is provided which includes a control circuit formed on an integrated circuit. The control circuit controls an operation of a device. The circuitry further includes a feedback circuit and a protection circuit. The feedback circuit includes a firs... | 11/11/1997 |
| 5684664 | Method for the production of an insulator An electrical insulator coated with electrically insulating material is disclosed. An electrically insulating material is applied on a primer coat, in which the uniformity of the applied primer coat can be checked in a comparatively simple manner. A fluor... | 11/04/1997 |
| 5680289 | Surge arrester A surge arrester has a single varistor element or a stack of varistor elements held between two end terminals by a plurality of elongate strength members disposed therearound. The ends of the strength members are inserted into recesses in the end terminal... | 10/21/1997 |
| 5675466 | Assembly structure of self-turn-off switching device and snubber circuit therefor An assembly structure of a self-turn-off switching device and a snubber circuit connected in parallel with the self-turn-off switching device. The snubber circuit is composed of at least a series circuit of a snubber diode and a snubber capacitor. The ass... | 10/07/1997 |
| 5666254 | Voltage sensing overcurrent protection circuit An overcurrent protection system which will give a rapid response to overcurrents which cause a reduction in the voltage across the load, e.g. a partial or complete short across the load, and is particularly suitable for protecting circuits against relati... | 09/09/1997 |
| 5663861 | Resettable automotive circuit protection device A circuit protection device including a pair of terminals to be electrically connected into an electrical circuit, a pair of spaced current-carrying extensions of the terminals, and an initially low resistance current limiting element extending between th... | 09/02/1997 |
| 5663859 | Disconnector switch for disconnecting a high-voltage arrester from ground An electric device, such as a transformer, has a tank and an arrester for protection against high voltage surges, the arrester being grounded to a wall of the tank. A switch is mounted in the tank wall for enabling the ground connection to be disconnected... | 09/02/1997 |
| 5654858 | Overvoltage control circuitry Output overvoltage protection circuitry for circuits operating at low voltages (e.g., 3 v) interfacing to a higher voltage operating circuit (e.g., 5 v bus). To prevent problems with a pull-up PMOS device at the output when the bus is pulled-up to the hig... | 08/05/1997 |
| 5652690 | Lightning arrester having a double enclosure assembly A lightning arrester module is double-enclosed to insure adequate environmental protection to the enclosed varistors as well as to contain the internal components of the arrester upon severe fault conditions. The internal components including the varistor... | 07/29/1997 |
| 5650902 | Substation for the distribution of electrical energy protected against arcing faults Substation for the distribution of electrical energy, and protected against arcing faults, characterized by the fact that Hall-effect sensors and additional optical fiber conductors are provided as sensors, whereby the Hall-effect sensors are logically AN... | 07/22/1997 |
| 5650903 | Superconducting-magnet electrical circuit having voltage and quench protection A superconductive-magnet electrical circuit includes a superconductive-coil assemblage having first, second, third, and fourth coil portions sequentially coupled together in series. A bipolar current-bypass electrical-circuit element (such as a pair of di... | 07/22/1997 |
| 5648887 | Electric current limiting device for winch responsive to multiple device states A winch system including an electric motor is protected against an overload condition by use of a current sense device and a current limiting device. The current limiting device employs multiple current thresholds to account for normal current usage by th... | 07/15/1997 |
| 5646811 | Reverse-charge prevention apparatus In a reverse-charge prevention apparatus (24) including a 1st breaker (25) for connecting or disconnecting an electric power system (A) to or from a distributed electric power apparatus (11), in which the 1st breaker (25) is switched off when the distribu... | 07/08/1997 |
| 5644465 | Surge arrester with external short-circuit device In a three-electrode surge arrester where the center electrode (3) is provided with a connecting wire (6) that projects outward radially and is provided with an outside short-circuit device, the latter consists of a two-arm spring clip (20) whose arms pro... | 07/01/1997 |
| 5644460 | Multi-rail electrostatic discharge protection device Device for protecting against circuit-damaging voltage spikes at input nodes and output nodes of electrical circuits and between high- and low-potential power rails. The voltage spikes are of the type identified generally as electrostatic discharges. The ... | 07/01/1997 |
| 5644462 | Electrical power/ground continuity indicator protection circuit The present invention concerns an electrical power cord having an illuminated connector including a circuit to protect a power and/or ground continuity indicator incorporated into the connector. The connector is illuminated if it is connected to an active... | 07/01/1997 |
| 5640293 | High-current, high-voltage solid state switch A high-current, high-voltage solid state switch includes at least one solid state switching component connected to control circuitry configured into a single package. In the preferred embodiment, the switching component includes a power field effect trans... | 06/17/1997 |
| 5638246 | Semiconductor device having a protection circuit, and electronic system including the same In a semiconductor device including a power MOSFET (M0) for the output stage, a temperature detection circuit produces an output signal upon detecting an abnormal rise in the chip temperature, the signal turns on a set input element (M1 | 06/10/1997 |
| 5638243 | Miswiring indicator in ground fault protection devices A ground fault protection electrical outlet with miswiring indication includes, besides a main outlet unit that includes a housing, a primary and a secondary pair of first and second electrical connectors accessibly arranged on the housing, two main switc... | 06/10/1997 |
| 5633774 | Electronic overload relay power source An overload relay, and an overload relay control circuit power source are disclosed herein. The overload relay includes an electronic trip circuit, a contactor such as a three-phase contactor, a current transformer associated with each power conductor cou... | 05/27/1997 |
| 5631800 | Apparatus for determining operating state of cooling fan An apparatus for detecting an operating state of a cooling fan in a computer system protects the computer system from damage due to excessive heat by preventing further operation of the computer system when the cooling fan is operating in an abnormal cond... | 05/20/1997 |
| 5627715 | Circuit construction for protective biasing A circuit construction for biasing near a pocket containing a power supply potential circuit element in a junction-isolated circuit. In normal operation if the polarity of the supply voltage is reversed from that intended the pocket is disconnected. To ac... | 05/06/1997 |
| 5627711 | Self-protected semiconductor protection component A monolithic protection semiconductor component is connected between a first semiconductor region apparent on a first surface of a semiconductor chip and a second semiconductor region apparent on a second surface. The first region is divided into several ... | 05/06/1997 |
| 5627710 | Electric motor drive system An electric motor drive system with an overload protector for the electric motor (10) is proposed, wherein the electric motor drive receives a signal from an input unit (18) for predetermining a desired position of a movable component. When the overload p... | 05/06/1997 |
| 5627708 | High power factor electronic stabilizer with protection circuit A high power factor electronic stabilizer with projection circuit application comprising a high frequency filter between the input of a power source and a rectifying circuit, a feed-back power factor improving circuit between the rectifying circuit and an... | 05/06/1997 |
| 5625523 | Surge arrester A fragmentation resisting core unit adapted for installation within a surge arrester outer housing and including a conventional array of non-linear core components arranged in series along a core axis between the inner faces of a pair of end terminals wit... | 04/29/1997 |
| 5625521 | Surge protection circuitry A three stage surge protection circuit for a three conductor power supply system. Each of the surge suppression stages include a varistor coupled across the line conductor and the neutral conductor, a varistor coupled across the neutral conductor and the ... | 04/29/1997 |
| 5623388 | Overvoltage protection circuits A miniature solid state overvoltage protection circuit for use on telephone lines using a solid state circuit arrangement connected between the tip terminal and the ground terminal and another solid state circuit between the ring terminal and the ground t... | 04/22/1997 |
| 5621598 | Luminous tube protection circuit A protection circuit for monitoring the power from a luminous tube transformer to a luminous tube including sensor connected to a secondary of the transformer, a window comparator circuit connected to the sensor and providing a fault signal when the senso... | 04/15/1997 |
