Apparatus and method for generting negative bias for isolated MO

Details Apparatus and method for generting negative bias for isolated MO Apparatus and method for generting negative bias for isolated MO

1994-07-20

1996-01-02

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327377, 327389, 327421, 327541, H03K 1704, H03K 1716

Patent

active

054812194

ABSTRACT:
An isolated MOSFET gate drive includes circuitry to provide a negative gate bias during the off time of the MOSFET to enhance its immunity to inadvertent turn-on. The bias is generated by a self contained two terminal passive network which may be "floated" at any potential with respect to ground. This bias is automatically generated through the action of the network to the gate drive waveform, eliminating the need for an external bias supply to provide this voltage. The bias supply is located locally, thus eliminating the need for long interconnects which may interfere with circuit operation. The bias network in one implementation is a combination of a capacitor and non-linear semiconductor device with a fixed voltage breakdown characteristic. This two-component implementation maintains the capability of producing systems with high packaging densities.

REFERENCES:
patent: 4728826 (1988-03-01), Einzinger et al.
patent: 4748351 (1988-08-01), Barzegar

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