Two stage gate drive circuit for a FET

Details Two stage gate drive circuit for a FET Two stage gate drive circuit for a FET

1993-06-21

1994-12-06

Sikes, William L.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327108, 327379, 327427, H03K 512, H03K 17687

Patent

active

053714156

ABSTRACT:
A two stage gate drive circuit (10) for controlling a power transistor (12) has been provided. The drive circuit includes a first stage (14) coupled to a first supply voltage terminal for providing a high current drive signal to the power transistor for quickly switching on the power transistor. However, once the power transistor is turned on, the first stage becomes inactive and a second stage (16) coupled to a second supply voltage terminal provides a low current drive signal to the power transistor for fully enhancing the power transistor and lowering its on resistance. The gate drive circuit further includes a timer circuit (18) for rendering the first stage active for predetermined period of time.

REFERENCES:
patent: 4142113 (1979-02-01), Lundberg
patent: 4266149 (1981-05-01), Yoshida
patent: 4992683 (1991-02-01), Robin

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