Switching control circuit for a power transistor

Details Switching control circuit for a power transistor Switching control circuit for a power transistor

1985-03-14

1987-02-24

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307270, 307297, 307300, H03K 1760, H03K 326, H03K 333

Patent

active

046459456

ABSTRACT:
A switching control circuit for power transistors controlling an inductive load. To avoid oversaturation of the transistor, causing excessive consumption and a switching difficulty on opening, said transistor is caused to operate at the limit of saturation, by means of an emitter resistor, a quasi current mirror in parallel across said resistor, another current mirror and a current amplifier. The current from said first current mirror is controlled on or off by a square wave generator such as those used in chopped power supplies or television scanning circuits for which the invention is particularly appropriate.

REFERENCES:
patent: 4213068 (1980-07-01), Ahmed
patent: 4215279 (1980-07-01), Lataire et al.
patent: 4323825 (1982-04-01), Hayes
patent: 4549095 (1985-10-01), Stefani et al.
IBM Technical Disclosure Bulletin, vol. 17, No. 4, Sep. 1974, pp. 1091-1092, New York, US; K. H. Knickmeyer: "Dynamic Transistor Antisaturation Control" --p. 1091, alinea 2--p. 1092.

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