Electricity: electrical systems and devices – Safety and protection of systems and devices – Transient responsive
Patent
1997-06-02
1999-05-11
Gaffin, Jeffrey
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transient responsive
361 18, 361 56, 361101, H02H3/00
Patent
active
059034254
ABSTRACT:
A control circuit for providing fast turn-off of a PNP transistor with output transient protection. An embodiment of the invention provides a current amplifier coupled between a positive voltage supply line and the base of a PNP switching transistor and an input device for providing an input current to the current amplifier. The current amplifier provides a transitory reverse drive current to the base of the PNP switching transistor. The current amplifier and the input device both include transient blocking junctions that block current flow from a positive voltage transient in excess of the positive supply voltage. The current amplifier is a PNP drive transistor in the preferred embodiment. The PNP drive transistor provides a transitory reverse drive current to the base of the PNP switching transistor. Control of the PNP drive transistor can be provided by a capacitor coupled between an input node and the base of an NPN transistor, the collector of the NPN transistor providing an amplified capacitor current to the base of the PNP drive transistor. A switching signal on the input node intermittently switches on and off a current source which intermittently drives the PNP switching transistor.
REFERENCES:
patent: 4375074 (1983-02-01), Glogolja
Cherry Semiconductor Corporation
Gaffin Jeffrey
Jackson Stephen
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