Base current regulation circuit for a switching transistor, in p

Details Base current regulation circuit for a switching transistor, in p Base current regulation circuit for a switching transistor, in p

1988-10-21

1991-05-21

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307300, 307263, H03K 301, H03K 326

Patent

active

050178024

ABSTRACT:
When triggering a bipolar switching transistor the control current for switching on the bipolar switching transistor must be set properly. If the transistor is oversaturated, the switch-off time response is poor. With too low a control current, however, high forward losses occur. A method and circuit configuration for base current regulation of bipolar transistors in periodic switching operation is introduced. The method provides defining as a measure of the saturation of the switching transistor the base current time integral required for sweeping the base region of charge carriers, and setting as a function of this value the base current for switching on the switching transistor.

REFERENCES:
patent: 4227123 (1980-10-01), Deitz
patent: 4239989 (1980-12-01), Brajder
patent: 4549095 (1985-10-01), Stefani et al.
patent: 4645945 (1987-02-01), de Sartre
patent: 4684824 (1987-08-01), Moberg
R. B. Jarl, "Antisaturation design techniques improve transistor switching speed", 10/27/83, EDN, pp. 265-272.
R. L. Bonkowski, "Speeding-Up Bipolars", 12/6/84, Machine Design, p. 136.
W. Schultz, "Baker Clamps-Traditional Concepts Updated for Third Generation Power Transistors", Jul./Aug. 84, Powerconversion Int'l, pp. 40-45.

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