Power transistor rapid turn off circuit for saving power

Details Power transistor rapid turn off circuit for saving power Power transistor rapid turn off circuit for saving power

1994-07-15

1995-11-14

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Accelerating switching

327427, 327108, H03K 1704, H03K 17687

Patent

active

054670470

ABSTRACT:
An integrated turn-off circuit rapidly turns off a power transistor (14) which saves power by reducing the power dissipated while the power transistor transitions from an on-state to an off state. During an enable cycle a first coupling circuit (19) couples an enabling signal to a gate of a power transistor (14). The enabling signal charges an input capacitance to a voltage that enables the power transistor (14). A first transistor (21) for discharging the input capacitance is disabled by a second transistor (23) during the enable cycle. During a disable cycle the first coupling circuit (19) decouples the gate of the power transistor (14) from a disabling signal. The disabling signal disables the second transistor (23). A second coupling circuit (22) couples a voltage to the first transistor (21) for enabling the first transistor (21) to discharge the input capacitance and disable the power transistor. The second decoupling circuit (22) decouples the gate of the power transistor (14) from a gate of the first transistor (21) as the input capacitance is discharged.

REFERENCES:
patent: 4481434 (1984-11-01), Janutka
patent: 4492883 (1985-01-01), Janutka
patent: 4677324 (1987-06-01), Ronan, Jr. et al.
patent: 4777387 (1988-10-01), Collins
patent: 5281862 (1994-01-01), Ma
patent: 5371418 (1994-12-01), Leipold et al.

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