Power supply based on normally parasitic resistance of solid state switch
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United States of America Patent
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-
Jul 21, 1992
Grant Date -
N/A
app pub date -
Jan 9, 1991
filing date -
Jan 9, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A current mode zero-voltage, parallel resonant switching power supply. The disclosed power supply includes a resonant tank comprising an inductorcapacitor pair, and having a variable output level. A solid-state switch controls the energy input to the tank. A comparator compares the voltage or other signal level from the switch to a threshold level so that the switch is closed when the voltage across it equals the threshold, and opened when the current through it corresponds to the threshold level. In one embodiment the threshold is produced by an error amplifier sensing the power supply output voltage, based on the difference between the output level and a reference level. A startup circuit is provided for energizing the tank when the power supply is initially powered, or under a load dump condition.
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