Electronic switching apparatus

H - Electricity – 03 – K

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H03K 17/60 (2006.01) H03K 17/04 (2006.01) H03K 17/042 (2006.01) H03K 17/0814 (2006.01)

Patent

CA 1236523

Abstract In an electronic switching apparatus comprising a power transistor (1) controlled by a control stage as the switching element, a switch-off relief circuit containing a series circuit of a condenser (11) and a diode (10) poled in the same sense as the power tran- sistor (1), and a discharge path which by-passes the collector- emitter path of the power transistor (1) and comprises a discharge resistor (12) for the condenser (11) and a discharge transistor (2; 13) operated simultaneously with the power transistor (1), the series circuit of the condenser (11) and diode (10) being in parallel with the collector-emitter path of the power transistor (1), the discharge current of the condenser (11) is led through the base-emitter path of the power transistor (1) to reduce the losses of the switching apparatus.

440268

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