|
Match
|
Document |
Document Title |
|
|
6034561 |
Integrated inductive load snubbing device
A transient suppressor comprises a self-triggered silicon control rectifier (SCR) that forms a drive circuit for an NPN power transistor. The SCR and the NPN power transistor are combined, along...
|
|
|
5027020 |
Zero voltage switching AC relay circuit
A zero voltage switching circuit for controlling current to a serially arranged load and AC voltage source including first and second photosensitive silicon controlled rectifiers having a gate,...
|
|
|
4801828 |
Multiphase solid-state contactor
A multiphase solid-state contactor for controlling a principal circuit, comprising a plurality of thyristors connected in anti-parallel relation, and an electronic control circuit connected to the...
|
|
|
4757341 |
AC contactless switch
A contactless switch for controlling a thyristor switching element by means of a sensor circuit includes a bridge rectifier across whose input terminals are connected in series on AC power supply...
|
|
|
4642481 |
Solid state hybrid switch
A hybrid switch (2) having a solid state circuit (2a) including a thyristor (SCR) for closing and reopening a supply circuit (S,4,6) to a load (L) and contacts including an isolating contact (S1)...
|
|
|
4572968 |
SCR Fire sensitivity control and fire control apparatus
An SCR with a fire sensitivity control circuit connected to one of the gates to greatly reduce the sensitivity of the SCR during initial turn-on of a potential source thereacross and fire pulse...
|
|
|
4456871 |
Power supply for electronic control system
An inexpensive power supply for an electconic control system or the like which is capable of converting a wide range of applied AC voltages into a regulated output voltage. A thyristor is coupled...
|
|
|
4365170 |
Semiconductor switch
A semiconductor switch comprises a PNPN switch including a semiconductor PNPN structure having at least three PN junctions, a first and a second transistor and a discharging means. The emitter and...
|
|
|
4333019 |
Silicon controlled rectifier trigger circuit
A silicon controlled rectifier trigger circuit is responsive to an input AC voltage and provides at least one drive pulse per switch activation to a load circuit. Such load circuit advantageously...
|
|
|
4306161 |
Simple method of switching an AC line
A switching circuit for an alternating current line allows the voltage or rrent coupled from the line to a load circuit to be controlled. Control may be in response to changes in voltage or current...
|
|
|
4302687 |
Semiconductor switch
A semiconductor (preferably a thyristor) switch has characteristics that can be represented by an equivalent circuit including an interconnected pair of opposite conductive types of transistors....
|
|
|
4239985 |
Trigger circuit for a thyristor
A trigger circuit for a thyristor comprising at least one of each of an NPN transistor and a PNP transistor and a PNPN switch to trigger a 4-terminal thyristor by feeding a collector current of the...
|
|
|
4239986 |
Power control arrangement and control circuit especially suitable for use therewith
An arrangement for controlling power during any given half cycle of AC power is disclosed herein and includes a gated switching device connected across an AC voltage supply, and a charging...
|
|
|
4203052 |
Solid state ignition system
A solid state ignition system for generating high frequency and high energy electrical pulses, the system providing improved performance under varying line voltage conditions, improved voltage...
|
|
|
4199694 |
Terminal convertible alternating current switch
An electronic A.C. switch which affords either "normally open" or "normally closed" type of operation to a connected alternating current source and load in accordance with which of two alternate...
|
|
|
4193023 |
Electronic monitoring system with low energy consumption in quiescent state
A contactless motion detector, such as an oscillator sensitive to an approaching metallic element, is connected across a storage capacitor which can be charged from a source of pulsating direct...
|
|
|
4184086 |
Semiconductor switch
A semiconductor switch comprising a PNPN switch which has a four-layered PNPN structure with at least three PN-junctions, switching means for electrically short-circuiting a path between a P-type...
|
|
|
4176288 |
Zero voltage switching solid state relay
A solid state relay or controlled switch for connecting an AC power source to a load includes a solid state switching circuit in which a semiconductor controlled rectifier element, such as a...
|
|
|
4163271 |
Electronic switching apparatus
An electronic switching apparatus comprising an elongate device having an opening in one end thereof for receipt of an electric conductor therethrough, a transformer winding surrounding the opening...
|
|
|
4162413 |
Semiconductor switch
A semiconductor switch comprising: a transistor; a thyristor connected between the collector and the base of the transistor; a first control device connected to the gate of the thyristor for...
|
|
|
4118768 |
Demand controlled preregulating rectifier circuit for power supplies
A rectifier and preregulator circuit using a first silicon controlled rectifier (SCR) to rectify AC voltage and apply the rectified voltage across a capacitor which is used as a storage device. The...
|
|
|
4080538 |
Method of controlling switching of PNPN semiconductor switching device
After a principal current through an SCR has been decreased to zero by inverting the polarity of the voltage between the main terminals of the SCR(anode voltage,) its gate is reversely biased with...
|
|
|
4047054 |
Thyristor switching circuit
A signal to be switched is applied across the conduction path of a thyristor and a trigger signal is applied to the thyristor gate electrode. False triggering, due to transients in either signal,...
|
|
|
4045822 |
Ground fault interrupter apparatus
In a ground fault interrupter in which the relay switch for interrupting current through a-c lines has its actuating coil selectively connected by a controlled rectifier to receive a-c line power,...
|
|
|
4039864 |
Semiconductor bidirectional switch circuit
A semiconductor bidirectional switch circuit comprises a bidirectional switch including two thyristors connected in antiparallel relationship. A bypass circuit is connected to each of the two...
|
|
|
3995176 |
Unidirectional alternating current interrupter operable over full half cycles
A unidirectional alternating current interrupter operable over full half cycles controls the passage of positive half cycles of a supply voltage VA into a load 2 disposed in series with a gate...
|
|
|
3971969 |
Electrically operated stapling device
An electrically operated stapling device is disclosed. Staples are driven into the article to be stapled by a simple driver blade which is powered by a current actuated solenoid. In the preferred...
|
|
|
3952242 |
Automatic voltage regulator with optical feedback
An automatic voltage regulator employing an optical feedback system, in which a luminous element, whose intensity varies in response to the variation in a regulated voltage, illuminates a...
|
|
|
3947754 |
Open loop series regulated power supply
Two AC-DC regulator circuits are disclosed which are suitable for providing a constant minimal ripple DC supply voltage in response to AC line voltages having varying peak amplitudes. Each of the...
|
|
|
3940634 |
Solid state AC power relay
A trigger type device employing a pair of oppositely poled SCR's or a triac, provides bidirectional control of AC power through a simple circuit comprising a pair of rectifying diodes and an...
|
|
|
3939396 |
Shunt A.C. voltage regulator with modified full-wave bridge
A semiconductor switching device is connected in shunt with an A.C. voltage source to be regulated. A modified full-wave bridge rectifier is connected across the voltage source by a first pair of...
|
|
|
3932803 |
Electronic monitoring system including contactless motion detector
A contactless motion detector, including an oscillator and an amplifier, has an energizing circuit connected across an electronic breakdown device lying in series with a contant-current unit, this...
|
|
|
3919629 |
Proximity sensing device using an inductance and capacitance resonant bridge network
A transistor driven inductance and capacitance bridge network is adjusted for oscillation by increasing the inductance of the coil in the collector circuit of the transistor and driven into...
|
|
|
3881118 |
Electronic switching circuits
Apparatus for use as a switch in series with an alternating current supply, including a bi-directional rectifier combination (for example a pair of thyristors); a bridge rectifier circuit; two...
|
|
|
3828314 |
END MARK CONTROLLED SWITCHING SYSTEM AND MATRIX
Electronic switching systems employing three terminal, four layer PNPN-type thyristors having their gates brought out from the layer or region adjacent their anodes and characterized by having...
|
|
|
3811052 |
ELECTRICAL FREQUENCY INDICATING MEANS
The invention describes means for monitoring electrical supply frequency suitable for use with an AC generator coupled to a prime motor e.g. through the auxiliary gearbox of an agricultural tractor...
|
|
|
3805147 |
ZERO-CROSSING TRIGGER CIRCUIT FOR FIRING SEMICONDUCTOR DEVICES AT ZERO VOLTAGE
A zero voltage triggering circuit for triggering semiconductor devices consists of a module which is applicable to single and three-phase operation for controlling the firing of a semiconductor...
|
|
|
3793537 |
FIRING CIRCUITRY FOR SEMICONDUCTIVE CONTROLLED RECTIFIERS
Firing circuitry for semiconductive controlled rectifiers and the like wherein transformer isolation is required between the gate of the rectifier and a firing circuit, and incorporating means for...
|
|
|
3781572 |
AC POWER CONTROL APPARATUS WITH DEMAND RESPONSIVE DRIVER CIRCUIT
AC power control apparatus with reduced power dissipation is provided wherein a three terminal semiconductor switch, such as a thyristor, has a demand responsive gate driver circuit that includes...
|
|
|
3766409 |
AC POWER CONTROL APPARATUS WITH IMPROVED SWITCH DRIVER MEANS
AC power control apparatus with reduced power dissipation is provided wherein a three terminal semiconductor switch, such as thyristor, has a gate driver circuit that includes a resistive impedance...
|
|
|
3742255 |
DUAL-MODE SOLID STATE RELAY
A solid state power relay which may optionally provide either a fast turn-on, as is preferred for luminous gas discharge lamps, or a gradual turn-on, as is preferred for incandescent lamps to...
|
|
|
3740582 |
POWER CONTROL SYSTEM EMPLOYING PIEZO-FERROELECTRIC DEVICES
An AC switch device, as for example, a silicon controlled rectifier or triac, is operably connected with an AC load and a source of alternating potential to regulate the amount of electrical power...
|
|
|
3711761 |
OFF DELAY TIMER AND INTERNALLY GENERATED AUXILIARY DIRECT CURRENT VOLTAGE SOURCE FOR A CONTROLLED RECTIFIER ALTERNATING CURRENT SWITCH FOR USE THEREIN
An alternating current switch includes a full-wave rectifier with one input terminal thereof connected to an alternating current line, and the other input terminal connected by way of a load...
|
|
|
3708696 |
ZERO VOLTAGE SWITCH MEANS FOR CONTROL OF ELECTRIC LOAD CIRCUIT
Four forms of the invention are shown and each comprises a zero voltage switching means for an AC electric load circuit having gate controlled semiconductors which are triggered in response to...
|
|
|
3684171 |
CIRCUIT FOR MONITORING A TEMPERATURE RELATED CONDITION AND FOR CONTROLLING A HEAT GENERATING DEVICE
The present invention employs a heat sensitive element to form one leg of a bridge circuit, with the bridge circuit providing the bias signals necessary to generate control signals. The present...
|
|
|
3681676 |
CYCLOCONVERTER SILICON CONTROLLED RECTIFIER GATE SIGNAL INHIBIT CIRCUIT
In a cycloconverter system, a gate signal inhibit circuit for maintaining the gate signal circuit of a corresponding cycloconverter silicon controlled rectifier interrupted when the forward...
|
|
|
3665212 |
ZERO CROSSING SOLID STATE SWITCH
There is disclosed herein a solid state switch for use with the application of a. c. power to a load circuit to eliminate high surge currents and transients that normally occur when switching line...
|
|
|
3663943 |
AUTOMATIC VOLTAGE REGULATING SYSTEM FOR A DC LOAD
For automatic voltage regulation for a DC load, fed from an AC source via a three-terminal thyristor or a silicon-controlled rectifier, a constant-voltage element is connected in parallel to the AC...
|
|
|
3648074 |
ON-OFF CONTROLLER WITH SOLID-STATE DIFFERENTIAL CIRCUIT
An on-off controller energized from an alternating current source with differential operation. The differential operation is obtained by using a solid-state circuit which introduces a resistance...
|
|
|
3648075 |
ZERO VOLTAGE SWITCHING AC RELAY CIRCUIT
An AC relay circuit is disclosed which includes a triac as its active switch element. A full wave rectifier is connected between one of the primary terminals and the gate terminal of the triac. A...
|