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| Number | Title | Issue Date |
| 7969701 | Fast react protection circuit for switched mode power amplifiers A protection circuit includes a diode chip, and a switching device integrated with the diode chip, the switching device being isolated, optically triggered, optically powered, and the diode chip connected between a high side terminal of the switching device and an i... | 06/28/2011 |
| 7715162 | Optically triggered electro-static discharge protection circuit The present invention provides a method and apparatus for providing electro-static discharge (ESD) protection between a first and a second circuit node. One embodiment of the ESD protection circuit includes one or more steering diodes that generate electromagnetic r... | 05/11/2010 |
| 7151462 | Circuit arrangement and method for load diagnosis of a semiconductor switch The present invention relates to a circuit arrangement and a method for load diagnosis of a switch having a first and a second load connecting terminal. A first and a second current source arrangement are provided, which can in each case be connected to one of the l... | 12/19/2006 |
| 6879477 | Power switching device in an electrical power distribution system on board a helicopter A power switching device in an electrical power distribution system on board a helicopter. There is a power switching device that switches on or off the power flow from a main distributor to the consumer. This switching device comprises an overhead panel with a swit... | 04/12/2005 |
| 6204493 | Fault tolerant electric current regulator The present invention is a fault tolerant apparatus for regulating the flow of electricity. The apparatus comprises a light radiating circuit which includes a first light source for radiating a first light signal, a second light source for radiating a sec... | 03/20/2001 |
| 6084760 | Device for driving self arc-extinguishing type power element A circuit for driving a self-arc-extinguishing type power element 1 such as an IGBT, includes a signal supply circuit 7 for supplying an ON/OFF signal to the power element 1, an insulation circuit 5 for insulating an output signal of the signal supply cir... | 07/04/2000 |
| 5815353 | Overvoltage protector An overvoltage arrester (8) consists of a plurality of limiter elements (15) connected in series. Parallel to this series of limiter elements (15) is a series of controlled switches (18). The two circuits interconnect ladder-style by means of cross links ... | 09/29/1998 |
| 5587865 | Electronic control equipment for motor vehicles, particularly, electronic brake control equipment Electronic control apparatus for motor vehicles. The apparatus includes a test circuit which causes a test current to flow through a load being operated by the apparatus and which detects the magnitude of the test current. From the magnitude of the test c... | 12/24/1996 |
| 5357393 | Integrated ultra low leakage high voltage protection circuit An integrated high voltage device with an ultra low leakage input protection circuit to be used in highly sensitive circuits which require ultra low input leakage current. The protection circuit has a common substrate with the integrated circuit device an... | 10/18/1994 |
| 5317469 | Arrangement of an over-voltage protection circuit A circuit arrangement having the function of preventing over-voltage damage which is structured by special copper foil or conductive wires and applies the burst absorption principle to form a short circuit from the input end and the output end of a circui... | 05/31/1994 |
| 5225958 | Electronic endoscope apparatus capable of protecting overvoltage for solid-state image sensor In an electronic endoscope apparatus, an overvoltage is produced by discharging electrostatic energy induced on an electronic scope made of a synthetic resin. The electronic scope used for the electronic endoscope apparatus comprises: a solid-state image ... | 07/06/1993 |
| 5212619 | Method and system for protecting a gate controlled thyristor against unacceptable overvoltage Protecting a gate fully controlled thyristor that is controlled by a drive circuit including a turn-on circuit and a turn-off circuit against overvoltage, is accomplished by monitoring the anode voltage of said gate fully controlled thyristor relative to ... | 05/18/1993 |
| 5193042 | Automatic energizing damping device An electronic automatic energizing damping device for connection to a source of electrical energy to protect and safeguard continuously all the devices, instruments, equipment and systems, connected to the source. The device comprises a control stage and ... | 03/09/1993 |
| 5146386 | Electronic monitoring and redundant control circuit for a power switch A protective circuit for removing power from a load detects the presence of a control signal which causes electrical power to be delivered to a load, for example, via a controlled switching device such as an electromechanical relay or a solid state relay.... | 09/08/1992 |
| 5146384 | Automatically resetting protection arrangement for a telephone subscriber line interface circuit A protection arrangement for coupling a two-wire line to a SLIC includes surge protecting triacs between each wire and ground, and normally closed contacts coupling the wires to the SLIC. The triacs are triggered via varistors coupled to the wires on the ... | 09/08/1992 |
| 5142428 | Water sensing type power breaker circuit A water sensing type power breaker circuit is incorporated into an electric appliance such as a hair dryer or the like and is used to cut off a power supply to prevent an accident due to an electric shock immediately when the electric appliance is dropped... | 08/25/1992 |
| 5089948 | High speed optoisolator switching apparatus An electrically isolated high speed optical switching arrangement for use as a computer over-voltage sensing circuit utilizing first and second optoisolator devices, the first having an input, a first signal from the output of a bus sensing circuitry whic... | 02/18/1992 |
| 5089926 | Current monitor using a DC isolating amplifier circuit A current monitor includes a DC isolating amplifier circuit especially adapted for adjusting the set point of a comparator. The isolating amplifier circuit includes an operational amplifier generating a first current in response to an input voltage receiv... | 02/18/1992 |
| 4998098 | Overvoltage detector to indicate voltage to a remote monitor An voltage monitoring system including means for providing a voltage from a current and for reducing the voltage. The system also includes means for integrating the current. The integrating means provides an output which increases from an initial conditio... | 03/05/1991 |
| 4955069 | A.C. power controller with short circuit and overload protection An A.C. solid state power controller for controlling the current through a load from an alternating current source, including a diode bridge rectifier with its direct current output connected to a solid state switch, such as a MOSFET or a bipolar transist... | 09/04/1990 |
| 4949213 | Drive circuit for use with voltage-drive semiconductor device In a common drive output circuit for driving dissimilar switching semiconductor devices having different drive input characteristics by turning on and off dc power supplies to apply a voltage between the drive input terminals of either one of the switchin... | 08/14/1990 |
| 4924344 | Circuitry for protection against electromotively-induced voltage transients in solid state relay circuits In a solid state relay circuit including a power semiconductor for switching power to a load circuit and having circuitry for disabling the power semiconductor to protect against current overload or short circuits, such disabling means including a silicon... | 05/08/1990 |
| 4916572 | Circuitry for protecting against load voltage transients in solid state relay circuits A solid state relay circuit including a power semiconductor for the switching device, the power semiconductor having gate, source, and drain terminals, the source and drain terminals being adapted to be connected across a load circuit, switching circuitry... | 04/10/1990 |
| 4882522 | Neon circuit malfunction detector A neon sign circuit is disclosed having a neon tube forming the lighted portion of the sign, a source of electrical power, and a high voltage transformer between the electrical power source and the neon tube. The circuit also includes a neon sign circuit ... | 11/21/1989 |
| 4866560 | Safeguarding electrical transient surge protection Electrical transient surge protection plus safeguarding of surge-protection apparatus against failure at high temperature. Thermally sensitive fusible devices are used in conjunction with voltage-limiting devices, specifically varistors, so as to protect ... | 09/12/1989 |
| 4794948 | Directional control valve having an optical position indicator A solenoid operated directional control valve includes a visual position indicator assembled of rectifying bridge circuit whose DC output terminals are bridged by a series connection of a light emitting diode with a PTC resistor. In this manner, the indic... | 01/03/1989 |
| 4796283 | Surge counter for an overvoltage arrester A device for counting the overvoltage surges discharged by a gapless overvoltage arrester contains a sensing head and a counting mechanism which follows the sensing head. In the sensing head, the discharge current carried by the overvoltage arrester in a ... | 01/03/1989 |
| 4757417 | Monitoring system for load-driving switch circuits Disclosed is a monitoring system for a load-driving switch circuit, in which a switch circuit arranged in a circuit for driving an electrical load is controlled and opened or closed by a fail-safe input signal Si, the conduction state or non-conduction st... | 07/12/1988 |
| 4712153 | Power circuit and trigger device comprising same A power circuit comprises a current amplifier circuit connected between a minimum potential line and a maximum potential line. It further comprises, connected between these lines together with the aforementioned main circuit, a protection circuit which ha... | 12/08/1987 |
| 4691263 | Low leakage, solid state a-c power contact A power contact with low off current for switching a-c loads in response to a logic signal includes a rectifier bridge circuit in a series with the load and the a-c power source, a MOSFET connected across the d-c terminals of the bridge, and a series RC f... | 09/01/1987 |
| 4605981 | Industrial or domestic overvoltage protective device The device includes two detectors of overvoltage (8, 9) each connected between a respective one of a pair of power line conductors (1, 2) and a respective input of an arrester (7). The outputs of the detectors are connected to an OR-gate (10) the output s... | 08/12/1986 |
| 4536816 | Thyristor apparatus employing light-triggered thyristors A thyristor apparatus employing light-triggered thyristors comprises forward voltage detecting circuits (15) and a thyristor number detecting circuit (17). The forward voltage detecting circuits (15) detect forward voltages applied to light-triggered thyr... | 08/20/1985 |
| 4473858 | Firing circuit for power thyristors A firing circuit for two antiparallel-connected power thyristors. Each of the power thyristors has a gate terminal; the gate terminals being connected by a series combination of auxiliary thyristors. Each of the auxiliary thyristors is of the type which c... | 09/25/1984 |
| 4424544 | Optically toggled bidirectional switch An optically toggled bidirectional normally-on switch is provided with protection against bilateral voltage and bidirectional current surges by the inclusion of a pair of oppositely poled thyristors. One version uses a large junction-type field-effect tra... | 01/03/1984 |
| 4408248 | Protection circuit A protection circuit for communication equipment connected to a two conductor communication line includes a bridge rectifier having alternating current terminals connected to the conductors and to ground. The direct current terminals of the rectifier are ... | 10/04/1983 |
| 4375073 | Dual-monitoring protection circuit for switching transistor A transistor having a selectively saturated emitter collector path is protected. The emitter collector voltage level is sensed as being greater than a predetermined level to indicate saturation as is the presence and absence of drive current to the base. ... | 02/22/1983 |
| 4371909 | High voltage converter apparatus having overvoltage protection circuits for thyristors A high voltage converter apparatus having overvoltage protection circuits for thyristors is disclosed in which, in order to protect series-connected thyristors in the converter against overvoltage, the converter is stopped when the overvoltage is generate... | 02/01/1983 |
| 4365281 | Protection circuit for switching transistors serially connected between a D.C. voltage source A protection circuit for a switching amplifier having a plurality of serially stacked switching transistors includes a voltage breakdown device and a current responsive device for sensing the voltage developed between the emitter and collector electrodes ... | 12/21/1982 |
| 4348709 | Electronic load protection circuit A load protecting circuit includes a triac connected in series with the load to provide an open circuit when a voltage drop or current surge is applied to the load. The triac is gated through a transistorized gating circuit which includes a zero-crossing ... | 09/07/1982 |
| 4217618 | Thyristor firing circuit module with integral optical isolation, dv/dt limitation, and bidirectional voltage transient suppression A thyristor firing module for use in high power circuits which provides protection against damage or misfiring. The module comprises optically isolated control circuitry optically coupled to firing circuitry which in turn is coupled to a darlington transi... | 08/12/1980 |
