Semiconductor circuit
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United States of America Patent
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Jul 7, 2009
Grant Date -
Sep 20, 2007
app pub date -
Feb 27, 2007
filing date -
Mar 20, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A semiconductor circuit suitable for normally-on switching elements or switching elements low in threshold voltage. A negative power supply is charged by a high-voltage power supply. A high-voltage switch controls the advisability of applying a voltage to a high-voltage terminal. With deducing the power supply to power switching elements, the high-voltage switch is turned off, and even in the case where the voltage of the controlling circuits of the power switching elements is reduced, the power supply capacitors for the controlling circuits are charged by the high-voltage terminal thereby to operate the controlling circuits. Further, a negative power source voltage generating circuit utilizes the energy charged to the capacitors from output terminals. A voltage terminal is inserted between the high-voltage terminal and a reference voltage terminal. The negative power source voltage generating circuit is interposed between the voltage terminal and a plurality of the output terminals.
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