High power transistor base drive circuit

Details High power transistor base drive circuit High power transistor base drive circuit

1985-03-28

1987-06-23

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307268, 307255, 307311, 307300, H03K 326, H03K 333, H03K 342

Patent

active

046755470

ABSTRACT:
In a base drive circuit for a high power transistor, an external signal is applied to the circuit by an optical coupler. In response to the external signal, the circuit provides a positive current to the high power transistor in order turn it on. The positive constant current is characterized by an initial spike that prevents any localized hot spots from developing in the high power transistor and thereafter the positive current becomes constant. The circuit also provides a constant negative current when the external signal is removed, thereby quickly turning off the high power transistor. The optical coupler and a time delay device provide the circuit with high noise immunity.

REFERENCES:
patent: 3787738 (1974-01-01), Horwath
patent: 4032834 (1977-06-01), Beierholm
patent: 4399500 (1983-08-01), Clarke et al.
patent: 4408137 (1983-10-01), Fox

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