Semiconductor switch circuit

Details Semiconductor switch circuit Semiconductor switch circuit

H - Electricity

03

K

328/195

H03K 17/72 (2006.01) H03K 17/60 (2006.01) H03K 17/615 (2006.01) H03K 17/73 (2006.01)

Patent

CA 1098978

ABSTRACT OF THE DISCLOSURE A semiconductor switch circuit comprises a PNPN switch having PN-junctions equivalently including first and second transistor; a load current dividing circuit including a tran- sistor; a variable impedance bypass cirdiut including a transistor; and a capacitive element. The base and the collec- tor of the transistor included in the load current dividing circuit being connected respectively to a cathode of the PNPN switch and an anode of the PNPN switch and an N-type base of the first transistor The collector and the emitter of the transistor included in the variable impedance bypass circuit being connected respectively to a P-type base of the second transistor of the PNPN switch and the emitter of the transis- tor included in said load current dividing circuit, and the base of the transistor in the variable impedance bypass circuit being connected to the anode of the PNPN switch and an N- type base of the first transistor of the PNPN switch through the capacitive element. The circuit provides gate turnoff operation of the switch circuit by controlling the base of the transistor inthe variable impedance bypass circuit.

277156

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