Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Accelerating switching
Patent
1997-06-02
1998-11-10
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Accelerating switching
327478, 327484, 327487, 327374, 326 18, H03K 1704
Patent
active
058349642
ABSTRACT:
A control circuit for providing fast turn on of a PNP transistor in which a capacitor charging current is boosted and provided to the base of the PNP transistor. An embodiment of the invention provides a current amplifier in parallel with a current source for coupling to the base of the PNP transistor. The PNP transistor is connected to a positive voltage supply. A capacitor is also coupled to the positive voltage supply for delivering a charging current amplifier. In a further embodiment, an NPN transistor has its base coupled to the capacitor and its collector coupled to the base of the PNP transistor for providing the drive current boost. A diode may be coupled to the capacitor for passing a discharge current to the capacitor when the PNP transistor is off and to block the capacitor current when the PNP transistor is being switched on. A PNP drive transistor may be coupled between the collector of the NPN transistor and the base of the PNP transistor.
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Callahan Timothy P.
Cherry Semiconductor Corporation
Kim Jung Ho
LandOfFree
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