Starting surge current protection circuit

Details Starting surge current protection circuit Starting surge current protection circuit

H - Electricity

02

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321/28, 321/76

H02H 7/12 (2006.01) H02H 3/08 (2006.01) H02H 9/00 (2006.01) H02H 11/00 (2006.01) H02M 3/00 (2006.01) H03F 1/52 (2006.01)

Patent

CA 1068781

SURGE CURRENT PROTECTION CIRCUIT ABSTRACT OF THE DISCLOSURE A surge current protection circuit includes an input terminal supplied with a rectified alternating voltage, an output terminal to be connected to a load, and a semicon- ductor controlled rectifier having its anode and cathode electrodes connected in series between the input and output terminals. The collector and emitter electrodes of a con- trol transistor are connected between the gate and cathode electrodes of the rectifier. The base-emitter voltage is supplied with any sharp transients, and the transistor becomes conductive before the rectifier if the transients are sharp enough and of high enough amplitude. Conduction of the transistor prevents the semiconductor controlled rectifier from conducting surge currents and protects circuits con- nected in series with the rectifier.

263298

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