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7259407 Isolated HF-control SCR switch  
A vertical SCR switch to be controlled by a high-frequency signal having at least four main alternated layers. The switch includes a gate terminal and a gate reference terminal connected via...
7038503 Driving circuit for electrical nailing gun  
A driving circuit for electrical nailing gun is disclosed to include a capacitive charging/discharging unit formed of a first resistor, a first diode, and a capacitor connected in series and...
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...
6480056 Network of triacs with gates referenced with respect to a common opposite face electrode  
The present invention relates to a triac network wherein each triac includes an N-type semiconductor substrate, containing a first thyristor comprised of NPNP regions and a second thyristor...
6466064 Frequency multiplier device and frequency multiplier circuit  
It is intended to provide a compact circuit configuration used for a frequency multiplier device, suitable to selectively output among a plurality of multiplied frequencies, with less power...
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...
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...
5391997 Optically isolated N-channel MOSFET driver  
An optically isolated N-channel MOSFET driver turns on a MOSFET device in response to an optical input signal to drive a load. The turn-on time of the MOSFET is enhanced by a current boost circuit....
5338991 High power solid state relay with input presence and polarity indication  
A solid state relay having an input circuit and a triac Darlington circuit coupled by a phototriac circuit. The input circuit having a bipolar indicator lamp for identifying the polarity and...
5323062 System for triac trigger control in combination with a sensing element  
A trigger control circuit of the kind wherein a load is supplied via a triac with current from an AC voltage supply source under the control of a triac control means in combination with a sensing...
5216303 Double solid state relay  
A new double solid state relay comprising two sets of solid state relays and being constructed in such a way that it can turn on and off a circuit with a voltage very close to zero. It is the only...
5036234 Control circuit for triacs  
A direct current voltage controlled triggering circuit for triacs connected via a consumer resistor to an alternating current supply voltage uses the controllable channel resistance of a field...
4991049 Anti-short-cycle circuit  
A protective time delay delay circuit delays energization to an electric load until a predetermined time has elapsed from a previous deenergization. A transistor has its emitter connected to an ac...
4803418 In-line electrical switch for AC power supply  
A proximity switch e.g. for a domestic a.c. supply is connected in-line e.g. in the live line of the supply between live and switch live terminals. No direct connection is made to the neutral line....
4719446 Remote control for combined ceiling fan and light fixture  
A remote control system for a combined ceiling fan and light fixture for use with existing AC current house wiring between a wall switch and a ceiling fixture including a wall control for...
4678985 Two-terminal line-powered control circuit  
A two-terminal line-powered control circuit is disclosed in which a triac is used to switch AC power to a load. When the triac is not conducting, a portion of the voltage appearing across it is...
4659941 Power sensing device  
A power sensing device is disclosed for use with an electrical alternating current (AC) power source, a primary load, and a plurality of secondary loads. The power sensing device detects when the...
4658129 Photoelectric control device which detects changes in light intensity  
A photoelectric control device having a photoelectric sensing unit for delivering an output voltage in response to changes of the intensity of light, the output voltage being applied to a capacitor...
4609865 Grounding system test apparatus  
The apparatus is used in conjunction with a power center or distribution box of a multi-phase trailing cable resistance grounded power system in coal mines and the like. It provides from phase...
4504778 Self-powered, self-regulated, electronic ac control system  
A system of controlling the operation of an AC load with a switch placed in series with the load, which switch is itself operated by dc control logic powered by power loss experienced by the switch...
4471372 FET Controlled Triac  
Bidirectional thyristor or Triac, including a semiconductor body, first and second antiparallel-connected thyristor sections integrated in the semiconductor body, each of the thyristor sections...
4464582 Water-safe hair dryer circuit  
An automatic power shut-off circuit for a wide variety of electrical appliances, such as hand-held hair dryers, razors, irons, hair curlers, etc. which pose a risk of electrocution when used around...
4453123 System for providing a firing signal to an electrical power switch  
A system for providing a firing signal to an electrical power switch at a selectable instant during each cycle of a periodic waveform electric power source. A comparator receives a signal varying...
4443712 Switch device for connecting AC power source to load  
In a switch device for connecting an AC power source to a load, a phase detector circuit detects the phase of a peak-volt point of the AC voltage. In response to the phase detector circuit, a...
4412140 Circuit for reducing current to light emitting diode of optically coupled driver  
A circuit is disclosed for reducing the average light emitting diode (LED) current required to latch an output triac. A ring oscillator coupled to a logic means provides a current pulse to the LED...
4394957 Sensor control device  
A sensor control device for controlling the operation of a device such as an air blower, including a sensor capable of sensing a change in the environment from a predetermined level and providing a...
4382192 Self-quenching circuit  
A switch, when closed, provides a low impedance conduction path for power being applied to a load and for the operating potential for a control circuit. The control circuit includes timing...
4380114 Method of making a semiconductor switching device  
A triac device includes a first silicon chip having regions of alternate conductivity type disposed in a PN-junction forming relationship which defines a center-fired triac. A second silicon chip...
4376253 Timed switch for an AC load  
The timed AC switch comprises a manual on-off switch in series with bidirectional semiconductor switch, such as a triac, for connection in a loop with an AC source and a load which would generally...
4369354 Arrangement for monitoring the operation of a heating element  
A heating arrangement in a fixing station of a printing device has its operation monitored by an arrangement in which a measuring element is disposed in series with the heating element and a switch...
4366678 Temperature control apparatus for refrigerating machine  
A temperature control apparatus for use in a refrigerating machine, wherein an a.c. control element and the solenoid coil of a holding type solenoid are connected in series in an a.c. power...
4360740 Low voltage switching circuit for controlling a high voltage electrical load  
Solid state high voltage electronic switching means, preferably a triac, is connected in series with a high voltage load, for instance, a light, across a high voltage alternating current power...
4360743 Solid state control device for gradually turning on and off an electrical load  
A solid state control device is disclosed for gradually controlling the turn on and turn off of a light bulb. The light bulb is connected to an AC power source through a full wave rectifier having...
4355343 Semiconductor switch failure control circuit  
A bidirectional semiconductor switch such as a Triac in the usual failure mode, wherein the device conducts continuously in only one direction, has a storage circuit in series intermediate the...
4355242 Voltage regulating system  
A voltage regulating or control system employing a triac for controlling the power supplied to a load from an alternating current (a.c.) voltage source uses an oscillator as a phase controller to...
4338546 Liquid level detection circuit for control of liquid level responsive device  
A liquid level presence detection circuit includes a selectively gatable TRIAC serially connected with a load and triggered into conduction by twin sensitive-gate SCR's connected anode-to-cathode...
4265394 Flue damper control system  
In a flue damper control system, a thermistor 64 responsive to flue temperatures upstream of the damper 12 is incorporated in a trigger circuit for a triac 52 which controls energization and...
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...
4238689 Vacuum cleaner control system  
A vacuum cleaner power and control system wherein a single pair of conductors is employed to transmit electrical power to a remote motor driven agitator and to selectively energize the blower motor...
4222087 Passive triac output asymmetry detector  
A passive circuit for protecting an AC driven load controlled by a solid state device such as a triac or the like. The circuit is coupled to the load and the solid state controller element and...
4193269 Apparatus for supplying a cooling liquid to a condenser of a refrigeration unit  
An apparatus for supplying a cooling liquid to a condenser of a refrigeration unit. The apparatus comprises a conduit for passing the cooling liquid from a source thereof into thermal communication...
4191875 Fan speed control used in induction cooking apparatus  
A cooking apparatus employing induction heating is normally constructed so as to utilize a metal housing supporting a cook top upon which there is located at least one induction heating coil. The...
4181921 Harmonic distortion attenuator  
A harmonic distortion attenuator in an AC power supply for reducing electrical energy consumption through the suppression of transient voltages in power supply lines or the like connected to the...
4107472 Semiconductor channel switch  
A plurality of PNPN switches, each permitting current flow in either, i.e., positive or negative, direction, are arranged at the cross points between the rows and the columns of the speech paths so...
4090107 Electric circuit control system using logic device  
A circuit is disclosed which is suitable for controlling lighting in a building from a multiple number of points. AC current to light bulbs is controlled by a triac which in turn is controlled by...
4087697 Rapid power transfer system  
A system for rapidly substituting one source of AC power for another. A solid-state gated electronic valve is coupled in circuit with a principal power source or "line" and the current through the...
4079267 Modular IC on-delay timer  
An on-delay timer of the solid state type incorporating integrated circuit (IC) modules including a five-transistor array in a dual-in-line package (DIP), a multiple-transistor monolithic...
4071028 Radio frequency cautery instrument and control unit therefor  
An improved radio frequency cautery instrument comprising a radio frequency signal generator for supplying both monopolar and bipolar radio frequency signal outputs for medical applications. A...
4065227 Control circuit  
A circuit to maintain the water level between low and high predetermined limits in a sump in which the signal from an upper limit probe operates a first lamp which illuminates a photo resistor...
4064404 Accessory for a garage door opener  
An accessory for a garage door opener which includes a circuit which is energized when the garage door operator is actuated and which can be used to energize a power circuit as, for example, a lamp...
Matches 1 - 50 out of 122 1 2 3 >