Circuit for shortening the turn-off time of a power transistor

Details Circuit for shortening the turn-off time of a power transistor Circuit for shortening the turn-off time of a power transistor

1992-12-17

1995-04-25

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327377, 327434, 327482, H03K 326, H03K 1756, H03K 17687, H03K 1760

Patent

active

054101905

ABSTRACT:
A circuit and method for driving an inductive load has a first transistor with a current flow path connected to provide drive current at an output node to the inductive load, and a control element for controlling the current in the first current flow path. The control element is adapted for connection to receive a control signal for turning the current in the first current flow path of the first transistor on and off. A second transistor has a current flow path connected between the output node and the control element of the first transistor, and has a control element for controlling the current in the current flow path. A capacitor is connected between the control element of the second transistor and a reference potential, the capacitor being much larger than an inherent capacitance at the control element of the first transistor divided by a current gain of the second transistor. Finally, a rectifier is connected between the output node of the first transistor and the capacitor. The transistors can be, for example, of NPN, field effect, n-channel MOS, or other transistor construction that can be easily integrated into an integrated circuit chip.

REFERENCES:
patent: 4227099 (1980-10-01), Houkes
patent: 4636713 (1987-01-01), Stefani
patent: 5138515 (1992-08-01), Bourgeois
Palmucci, "Switching Regulator With Transistor Turnoff", IBM Technical Disclosure Bulletin, vol. 16, No. 4, Sep. 1973, p. 1161.

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