Input drive apparatus for power transistor
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United States of America Patent
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-
Aug 12, 1986
Grant Date -
N/A
app pub date -
Jun 26, 1984
filing date -
Jul 4, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An input drive apparatus of a power transistor is constituted by a transformer having a core with an air gap, a primary winding energized from an input source in accordance with a forward input bias instruction, and a secondary winding, a first transistor electrically insulated from the input source and turned ON by the voltage of the secondary winding for supplying a forward input bias to the power transistor, and a second transistor electrically insulated from the input source and turned ON in accordance with a reverse input bias instruction for supplying electromagnetic energy stored in the transformer to the input electrode of the power transistor to act as a reverse bias current in accordance with a reverse bias instruction. These is also provided diode means for returning to the input source the electromagnetic energy stored after charge carriers accumulated in the power transistor have been extinguished, and the electromagnetic energy stored in the transformer when a forward bias instruction is applied.
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