Appeal No. 96-2551
Application 08/037,767
§ 102(b). No claims have been indicated as allowable. We reverse
both grounds of rejection.
The claimed subject matter is a gate drive for rapidly
turning on and off a high current capacity power switch, such as
an insulated gate bipolar transistor in an inverter operated in a
pulse-width modulated mode of operation. Claim 1 reads as
follows:
1. A drive circuit for a power switching
device, comprising:
a transformer having a primary winding and a
secondary winding across which secondary pulses of first
and second polarities and first and second magnitudes
are developed when input pulses of opposing polarities
are provided to the primary winding;
a full-wave rectifier bridge having first and
second nodes coupled to the secondary winding and third
and fourth nodes;
first and second capacitors connected in series
between the third and fourth nodes;
first and second controlled switches coupled
between a control electrode of the power switching
device and the first and second capacitors,
respectively, each controlled switch having a control
electrode coupled to the secondary winding of the
transformer;
-2-
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