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7339414 Method and circuit arrangement for monitoring the mode of operation of one or more load circuits, especially of a domestic appliance  
The invention relates to a method and a circuit arrangement for monitoring the mode of operation of one or more load circuits, especially of a domestic appliance, which contains a controlled...
7193337 System and method utilizing a solid state power controller (SSPC) for controlling an electrical load of a variable frequency three-phase power source  
A solid state power controller (SSPC) ( 100 ) includes a power switching controller ( 30 ) and power switching devices (PSDs) ( 20 A, 20 B, 20 C) for controlling each phase of a multiple-phase...
6590349 Bidirectional flip-flop  
A bidirectional switch, including a first bidirectional switch between two power terminals of the switch, a low-voltage storage element between a first power terminal and a control terminal of the...
6373319 Bistable high-voltage bidirectional switch  
A high-voltage bidirectional switch, including a high-voltage bidirectional switching element, and circuitry for making the switching element bistable and controllable by, at most, two low-voltage...
6369640 Zero crossing control structure for a bidirectional switch with a stable threshold  
A zero crossing control circuit of a bidirectional switch including two transistors of complementary types connected in parallel between the gate of the bidirectional switch and the main reference...
5955794 Method and arrangement for controlling the output of a load connected to an ac line voltage  
A method and arrangement for controlling the output of electrical consumers connected to ac line voltage, especially of electric motors and the like, in which the output is changed by changing the...
5914628 Circuit for controlling a triac at the voltage zero  
The present invention relates to a circuit for controlling a triac at the voltage zero. Two transistors of complementary types are connected in parallel between the gate and the main reference...
5686857 Zero-crossing triac and method  
A triac (100) utilizes an FET (107) to inhibit firing of a transistor (112) that forms a portion of the SCR of the triac (100). A DMOS transistor (106) is used to supply a substantially constant...
5668496 Circuit arrangement for limiting the current to be switched of an electrical load  
A circuit arrangement for limiting the current to be switched of an electrical load, with the power input of the electrical load being controlled by means of a Triac, said Triac being connected in...
5592073 Triac control circuit  
A common and inexpensive integrated 555 timing circuit is used to vary the timing of triac firing pulses in response to a control voltage. A trigger pulse generator generates a pulse at each zero...
RE35013 Temperature control circuit having series connected fail-safe control  
An improved temperature control circuit having a controller portion with an inhibit input and a temperature responsive circuit portion that includes a resistive portion connected in series with a...
4574200 Thermistor temperature control circuit  
A temperature controlled circuit including a thermistor located in one branch of a bridge circuit containing several resistors, an operational amplifier, all combined in such a manner that a...
4553041 Monolithic zero crossing triac driver  
A monolithic, light-activated zero-crossing triac driver is provided that includes back-to-back thyristors, whose gates are shunted by both a resistor to reduce the overall sensitivity and a first...
4524258 Back-up control circuit for controlling a magnetron of a microwave oven  
A control circuit for controlling a magnetron of a microwave oven includes a microcomputer output control means for controlling the energy output of the microwave oven, and a means for controlling...
4377739 Average power control apparatus and method  
A power control method and apparatus maintains a constant average power at an electrical load, such as a fuser in an electrophotocopy machine. A power monitor measures the average power delivered...
4374321 Automatic temperature controller for an electrophotographic apparatus fuser and method therefor  
A copier fuser roll's temperature is accurately maintained by supplying selected half-cycles of current from a power supply to a heater in accordance with signals from a temperature sensor. Each...
4334184 Electronic sensor on/off switch  
Electronic sensor on/off switch for a load connected to an a-c supply network includes a controlled semiconductor switch connected in series with the load, a sensor for switching the load on and...
4296312 Electronic temperature sensing system for toaster appliances  
An electronic temperature sensing system for toaster appliances and the like which is capable of providing a consistent toast color independent of toast compartment temperature at the initiation of...
4278873 Temperature-responsive control means  
A temperature-responsive control system is provided for sensing the temperature of a heating circuit and automatically shutting off the input power when the temperature exceeds an acceptable range....
4218648 Arrangement for reducing no-load current in an energized transformer  
A two-terminal control and power switching circuit for substantially reducing electric current flow in the primary winding of an energized power transformer when no load is connected to the...
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...
4167696 Zero phase switching for multi-phase systems  
A multi-phase, zero phase control apparatus is disclosed having switches for controlling the application of power from a multi-phase source to a load and a control apparatus for energizing the...
4158150 Solid state relay with zero crossover feature  
A solid state relay in which the control circuit for controlling a bidirectional conduction device (triac) includes a silicon controlled rectifier (SCR) and a photo transistor that is responsive to...
4157481 Integral cycle switch synchronized to axis-crossing  
A switching circuit is comprised of a triac in series with the electrical load across an AC power source. The triac commences to conduct only after a unidirectional, gate-controlled SCR is...
4129791 Solid state switching circuit  
This invention relates to an improved solid state switching circuit for switching an A.C. load current fed from an A.C. power supply in response to values of input signal. The improvement is that,...
4087702 Digital electronic dimmer  
Disclosed is a lamp-dimmer which employs a novel circuit to provide a digitally selected and phase-shifted trigger-impulse for firing a triac.
4024457 Hard-firing zero-crossing trigger control circuit  
Presented is an electronic circuit composed of various cooperating semiconductor-type devices controlling the degree and timing of triggering of a power switching device to effect controlled...
3992638 Synchronous switch  
A synchronous switch for alternating circuits or rectified alternating circuits, the operation of which is automatically synchronized on the passage to zero of the load voltage at its terminals....
3961236 Constant power regulator for xerographic fusing system  
A constant power regulator for a xerographic fuser in which power control is achieved by taking the sum of the load voltage and current. The regulator includes an operational amplifier connected as...
3956644 Integral cycle, precise zero voltage switch  
Alternating current from a source is supplied to a load through a thyristor whose gate electrode is controlled by the output from a zero voltage switch. The zero voltage switch is enabled by the...
3955104 Synchronous control device for a static relay by a high frequency signal  
This invention relates to a synchronous device for a static relay by a high frequency signal. According to this invention, a high frequency alternating signal source is serially connected with a...
3950657 Timer circuits  
Clock pulses for a counter and trigger pulses for a thyristor switch are derived from the axis crossings of an alternating current signal. Logic circuits responsive to the counter determine the...
3935482 Electronic switching circuit with zero voltage switching  
Disclosed is an electronic switch circuit including a switching thyristor with two switch terminals that are connected to a controlled circuit. A trigger circuit is coupled to the gate terminal of...
3925688 Integral cycle zero-voltage switching circuits  
An input signal having a period T is applied to a series connected load and triggerable bidirectional switch. A zero crossing detector provides a trigger pulse at each axis crossing of either the...
3917962 Synchronous switching circuit  
A switching circuit for controlling the application of an a.c. source to a load employs a detector for triggering a control thyristor at a zero-voltage crossing of the a.c. source and means for...
3902080 Switching device  
A switching assembly wherein a triac is controlled by a magnetically-operated reed switch. The reed switch is in turn operated by a magnet attached to a slidable button. The circuitry includes a...
3885170 Method for motor control  
An inductive load sensing circuit associated with triac switched electrical motors including signal means for providing an electrical signal indicative of the switching voltage of the triac, an AND...
3881119 Light sensitive zero voltage switch  
A system for heating and/or cooling utilizing a new two-wire thermostat and/or a zero voltage switch. Plural stages of heating and/or cooling may be provided with a single two-wire thermostat. That...
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...
3859591 SOFT TURN-ON POWER SWITCHING CIRCUIT  
A triac is turned on during each successive half wave of AC in response to zero-crossing signals which generate a composite ramp voltage, including short sawtooth and long ramp voltages, which...
3848140 CONTROL CIRCUIT FOR THYRISTORS  
A circuit is disclosed for controlling the trigger of a thyristor by detection of the passage through zero of the alternating feeding voltage. According to the invention a photocoupler is...
3745378 ZERO VOLTAGE FIRING PROPORTIONAL CONTROLLER  
A proportional controller in which a triac is controlled by a zero-voltage switch responsive to changes in a sensor having a negative temperature coefficient of resistance. The triac supplies...
3743860 FULL CYCLE SYNCHRONOUS-SWITCHING CONTROL CIRCUIT  
A synchronous-switching circuit for a gate-controlled bidirectional switch controls the flow of power between an alternating current source and a load. The application of a gate-biasing potential...
3723769 SOLID STATE RELAY CIRCUIT WITH OPTICAL ISOLATION AND ZERO-CROSS FIRING  
A solid state relay circuit is provided which has four terminals, two for power input, and two for signal input. The circuit consists of a full-wave diode bridge circuit having a pilot thyristor...
3715651 ANALOG-TYPE CONSTANT-CURRENT REGULATOR  
Analog-type constant-current regulator which works as an alternating-current setting controller. It operates with a phase-angle split control and a zero-voltage switch. Across a rectifier, the...
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...
3649849 TRIGGERING CIRCUITS FOR GATE-CONTROLLED FULL-WAVE ALTERNATING CURRENT SEMICONDUCTOR SWITCHES  
Trigger circuits for rendering conductive a gate-controlled full-wave alternating current semiconductor switch (thyristor) by generating triggering pulses which are synchronized with the...
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...
3582685 ZERO CROSSOVER FIRING OF THYRISTOR MEANS  
The firing of an alternating current energized triac is controlled by a unijunction transistor. Both the base-to-base voltage and the triggering voltage of the unijunction transistor are supplied...
3495098 SYNCHRONOUS SYMMETRICAL A.C. SWITCH  
Matches 1 - 50 out of 59 1 2 >