Proportional base drive circuit

Details Proportional base drive circuit Proportional base drive circuit

1980-12-23

1982-08-03

Pellinen, A. D.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

307300, H03K 1704

Patent

active

043429564

ABSTRACT:
An improved proportional base drive circuit for rapidly and efficiently switching a high current bipolar transistor includes a transformer having first and second serially connected windings coupled in a load current path between the emitter terminal of the transistor and a load. A base terminal of the transistor is connected to a junction intermediate the two windings by a base bias circuit. The turns ratio between the two windings is selected to force a proportional base current to flow to the transistor. A third winding is provided, along with switching apparatus for exciting the third winding, whereby conduction of the load transistor can be initiated by energizing the third winding. A diverter circuit connected to the third winding allows rapid removal of current from the base of the load transistor for fast turn-off. In an alternative embodiment, a fourth winding is arranged to provide a driving current for more rapid forcing of current from the base drive circuit at turn-off.

REFERENCES:
patent: 3541420 (1970-11-01), Rees
patent: 3610963 (1971-10-01), Higgins
patent: 3657569 (1972-04-01), Froeschle
patent: 3983418 (1976-09-01), Wallace
patent: 3986052 (1976-10-01), Hunter
patent: 4178521 (1979-12-01), Speth
Norton, "Turnoff Circuit", IBMTDB, vol. 7, No. 6, Nov. 1964, p. 428.
Fugere et al., "Transformer-Coupled Storage Charge Removal", IBMTDB, vol. 14, No. 6, Nov. 1971, p. 1691.
Palmucci, "Switching Regulator with Transistor Turnoff", IBMTDB, vol. 16, No. 4, Sep. 1973, p. 1161.
Leung, "Power Transistor Switch", IBMTDB, vol. 11, No. 2, Jul. 1968, p. 210.

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