Abstract: The protection device of an electronic circuit is an electronic AC circuit protection device. The protection device has the characteristic of over-voltage protection, over-current protection, electronic switch, and soft start. Devices of the protection circuit are electronic box, electronic devices box, and power factor regulator that is designed in the structure of L.C. in parallel on the source side of the protection circuit. The protection circuit can be applied in switching power supply, electronic ballast, etc., electronic circuit devices. The main electrical electronic devices include Triac Thyristor, Silicon Controlled Rectifier, Phototriac Coupler and Photothyistor Coupler etc. The protection device has characteristic of standing surge current that solving the problem of life and reliability of electronic devices in now a day. The invention is a necessary protection device for electrical industrial.

Abstract: A new fluorescent device including an electronic fluorescent starter, a phase leading capacitor, a ballast, a bridge rectifier, a fluorescent lamp, a brightness compensation circuit, and a control circuit, the electronic fluorescent starter consisting of a master switch circuit, an ignition circuit and a time control circuit, wherein the electronic fluorescent starter matches with the ballast to turn on the fluorescent lamp; the control circuit turns the electronic fluorescent starter to the open circuit state when the fluorescent lamp is turned on; the brightness compensation circuit improves the intensity of light from the fluorescent lamp.

Abstract: A microcontroller for providing remote control of electrical switches and comprising a control unit and a switch unit. The control unit comprises a telephone interface, a keyboard, a central processing unit and a character pattern interface. The switch unit comprises a data decoder, a central processing unit and a plurality of solid state relays, wherein the solid state relays are controlled to selectively connect power to loads or disconnect power therefrom, in response to commands sent from the keyboard directly, or through a telephone or radio telephone or a computer network from the keyboard.

Abstract: A battery charging device capable of charging any variety of rechargeable batteries and capable of being powered by either a 110 volt or a 220 volt A.C. power source. The battery charging device comprises an integrator circuit having a D.C. power source; a voltage comparator; a solid state relay; a D.C. output circuit; a positive voltage feedback circuit; and a negative voltage feedback circuit. The integrator circuit receives A.C. power from an A.C. power source and provides an output to the voltage comparator. The voltage comparator, in turn, is connected so as to provide an output to the solid state relay. The solid state relay preferably includes a zero voltage closing circuit and provides an output to the D.C. output circuit. The D.C. output circuit is connected to a battery-to-be-charged and provides an output D.C. voltage thereto. The D.C. output circuit is also connected to and provides outputs to the negative and positive feedback circuits which, in turn, provide feedback to the voltage comparator.

Abstract: 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 presence of an input voltage. The phototriac circuit and the triac Darlington circuit each having bipolar indicator lamps to indicate ON/OFF operation of respective triacs therein.

Abstract: A new computer controller is disclosed for controlling the output voltage of a SCR controller to a load. The computer controller includes a computer unit comprising a first pulse generator, a central processing unit, a first voltage comparator and a digital analog converter, and a control unit controlled by the computer unit and connected to the load through the SCR controller and consisting of a second pulse generator, an integrator circuit, a second voltage comparator, a turn-on circuit and a turn-off circuit.

Abstract: 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 circuit when the circuit is subject to an over-voltage or a transient electrical strike, so as to protect the electronic elements within the area of the circuit. The method can be put into application in a transformer, a switching power supply, an electronic computer, a solid-state relay and other similar electronic equipment. The arrangement of the present invention has undergone a number of high voltage and electrical striking tests with more than satisfactory results and is suitable for use in industries.

Abstract: 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 solid type double solid state relay in the world and is safe enough for popular use in the industry.

Abstract: A solid state relay comprising an input terminal, an optical coupler, a reference voltage circuit, a light dependent resistor circuit, a triac driver circuit, a triac circuit, an output terminal and a snubber circuit, and being constructed in such a way that it can turn ON and OFF a supply of AC power to the load.

Abstract: A SCR (silicon controlled rectifier) control circuit using two pulses to turn-on and turn-off the SCR, the time of turn-on and turn-off being selectively controlled.

Abstract: A dual solid state relay comprised of an input circuit, an optical coupler, a reference voltage circuit, a switch circuit, an SCR saturation circuit, a full wave bridge rectifier, a TRIAC driver circuit, an SCR driver circuit, a TRIAC slave circuit, an SCR slave circuit, a snobber circuit, and an output port. The TRIAC slave circuit and the SCR slave circuit are driven by the TRIAC driver circuit and the SCR driver circuit, respectively. The relay circuit is designed to employ additional TRIACs and SCRs in the event that the switching of very high currents and voltages becomes necessary. A further feature of the present invention is a SPDT switch which allows the user the opportunity of choosing which part of the relay circuit is utilized (TRIAC or SCR).

Abstract: A new SCR (silicon controlled rectifier) controller characterized by comprising input circuits, SCR trigger circuits, charge circuits, commutation capacitor, discharge circuits and SCR and being constructed in such way that when the input pulse is positive, it will work to activate the trigger and cause the SCR to be in turn-on state as well as to charge the commutation capacitor and when the input pulse is zero, the stored energy of the commutation capacitor will discharge to cause the SCR to be in turn-off state so that it does not need any other electric energy to attain the objective to cut off the source.

Abstract: A new GTO (gate turn-off) thyristor, especially one which can freely control the turn-on and turn-off of the SCR (silicon controlled rectifier) without affecting the features of the A.C. and D.C. function of the SCR i.e. the switching function of great current and high voltage which is impossible for transistor. The power consumption of the control circuits is very low and the power can be supplied by the input control source at the gate or by a separate source. With special design, this invention has little malfunction and is the best GTO thyristor in the world.