Bridge base control circuit with controlled blocking even in the

Details Bridge base control circuit with controlled blocking even in the Bridge base control circuit with controlled blocking even in the

1988-07-19

1990-08-21

James, Andrew J.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307571, 307576, 307579, 307585, 307270, 307257, 307315, 323289, H03K 1760, H03K 17687, H03K 301, G05F 140

Patent

active

049509306

ABSTRACT:
A bridge base control circuit for a power switch. At the switching off, the base is connected with a reference terminal (M) through a first switching means (T2) having a low impedance and the emitter is connected with a supply terminal (Vcc) through a second switching means for allowing the reverse current to flow through the base-emitter junction. The second switching means has a low impedance as long as the voltage V.sub.BE is low, immediately after its switching on and that of the first switching means, and a high impedance (R1) as soon as the emitter voltage is approaching the supply voltage (VCC), this transition being automatically carried out.

REFERENCES:
patent: 3400304 (1968-09-01), Ziegler
patent: 3678291 (1972-07-01), Coe
patent: 4454454 (1984-06-01), Valentine
patent: 4540899 (1985-09-01), Pelly
patent: 4541389 (1985-09-01), Kosak et al.

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