SNUBBER CIRCUIT
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United States of America Patent
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Issued Date -
Sep 22, 2016
app pub date -
Dec 16, 2015
filing date -
Mar 17, 2015
priority date (Note) -
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Abstract
An embodiment of a snubber circuit that absorbs a surge voltage generated in a transformer of a switching power supply, comprises a diode, a zener diode electrically connected to the diode, and a first capacitor electrically connected to the zener diode. The diode, the zener diode, and the first capacitor are serially connected such that, at occurrence of the surge voltage, the diode operates in a forward direction and the first capacitor is charged with the surge voltage via a breakdown voltage of the zener diode, and the diode has reverse recovery time that is longer than a half of a cycle of a ringing voltage generated in a winding of the transformer and is in a range of 125 ns to 7 μs.
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