Protection circuit for transistorized switch

Details Protection circuit for transistorized switch Protection circuit for transistorized switch

H - Electricity

03

K

328/198

H03K 17/08 (2006.01) H03K 17/082 (2006.01) H03K 17/66 (2006.01) H03K 17/795 (2006.01)

Patent

CA 1122663

U.S. 855,994 ABSTRACT OF THE DISCLOSURE The collector-emitter voltages (Vce) of each one of the two transistors of a single-pole-double-throw transistorized switch are independently sensed by a sensing circuit for producing a fault signal, whenever the Vce of each transistor concurrently approaches or exceeds the magnitudes of first and second DC reference voltages, respectively, by predetermined differentials. Control logic is responsive to the fault signal for removing the base drive from the conducting one of the transistors. An RC network is included in the sensing circuit, for delaying the production of the fault signal, both to avoid false triggering of the control logic, and to provide time for sequentially turning off one transistor and turning on the other transistor.

314201

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