Class 327/452 - With triac

Subclass of Class 327 - Miscellaneous active electrical nonlinear devices, circuits, and systems
Definition: Subject matter including a bidirectional rectifier (essentially
No. of patents: 37
Last issue date: 03/04/2008

Number	Title	Issue Date
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 semiconductor switch, such as a triac, and an electric consumer. Said switc...	03/04/2008
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) (20A, 20B, 20C) for controlling each phase of a multiple-phase load to switch-on or -off at a zero-crossing p...	03/20/2007
7151402	Triac control circuit A circuit for controlling a triac, comprising: a bidirectional current-limiting active element connecting the triac gate to its opposite power electrode; and a switch connecting the gate to the other power electrode of the triac. ...	12/19/2006
6943329	Induction heating system for reduced switch stress An induction heating system is provided. The induction heating system comprises a power switch, a resonant heating circuit, and a pulse initiator. The resonant heating circuit is configured to generate an oscillating voltage in response to a DC pulse input. The puls...	09/13/2005
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 switch, and a control stage adapted to cause, upon each ha...	07/08/2003
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 pulse signals....	04/16/2002
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 terminal of the bidirectional switch, the gate of the bidi...	04/09/2002
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 phase control of the electric alternating magnitude suppli...	09/21/1999
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 terminal of the triac. The control terminals of the transistor...	06/22/1999
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 bias current to the transistor (107) in order to facilitate ...	11/11/1997
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 series with the electrical load, with a Diac being connect...	09/16/1997
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 cross-over of an AC line. This pulse initiates a variable, ...	01/07/1997
4876498	Two wire low voltage dimmer A low voltage two wire dimming circuit comprises voltage compensating means for regulating the RMS value of an AC voltage applied to a load and correcting means for eliminating damaging DC current that may flow through the load. The voltage compensating m...	10/24/1989
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 resistor is inserted in parallel with the thermistor to lower it...	03/04/1986
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 field effect transistor. A second field effect transistor ...	11/12/1985
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 the magnetron in response to a time signal and a food temp...	06/18/1985
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 to the load and compares the measured power to a predetermi...	03/22/1983
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 sequential half-cycle is assigned a unique digital input num...	02/15/1983
4334183	Electronic sensor on/off switch Electronic sensor on/off switch for a load connected to an a-c supply network, including a controlled semiconductor switch connected in a series circuit with the load, a sensor for switching the load on and off, a control circuit connected from the sensor...	06/08/1982
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 off, a control circuit connected from the sensor to the swit...	06/08/1982
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 each toasting operation, the condition of the bread to be...	10/20/1981
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. Manually operated means are provided for initiating heati...	07/14/1981
4266177	Power factor control system for AC induction motors A power control circuit for an induction motor wherein a servo loop is used to control power input by controlling the power factor of motor operation, and wherein the power factor is measured by summing the voltage and current derived square wave signals....	05/05/1981
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 transformer secondary. A triac, in series with the power transfor...	08/19/1980
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 photothyristor, thyristor or light-AC controlled element, is ign...	11/27/1979
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 switches to conduct current to the load beginning at the zero ...	09/11/1979
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 a light coupled control signal. Both the SCR and the phot...	06/12/1979
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 conducting. Conduction of the SCR drives the gate of the triac ena...	06/05/1979
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, a pair of thyristors are provided in the circuit, for each...	12/12/1978
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....	05/02/1978
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 electrical conduction through the device. The circuit achieves a...	05/17/1977
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. This synchronous switch contains essentially a semi-conducto...	11/16/1976
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 a voltage adding circuit. The operational circuit amplifi...	06/01/1976
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 output of a flip-flop beginning at the simultaneous occurren...	05/11/1976
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 diode between the anode a and the gate g of a thyristor, the...	05/04/1976
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 total number of trigger pulses supplied to the thyristor subs...	04/13/1976
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 the thyristor to selectively supply trigger signals and th...	01/27/1976

PatentStorm

Bizarre Patents

PatentStorm News

Class 327/452 - With triac