INRUSH CURRENT PROTECTION CIRCUIT
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United States of America Patent
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Issued Date -
Nov 24, 2016
app pub date -
Jun 25, 2015
filing date -
Jun 25, 2015
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Abstract
An inrush current protection circuit includes a DC/DC convertor, a control circuit, and a comparison circuit. The control circuit includes a field effect transistor (FET) and a first capacitor coupled to the FET. The comparison circuit and the FET are coupled to the DC/DC convertor. The comparison circuit is configured to output a control signal after the DC/DC convertor soft starts. The first capacitor is configured to be charged after receiving the control signal. The FET is configured to be switched on after a first period of time after the first capacitor is charged. The first capacitor is also configured to be discharged after being charged. The FET is also configured to be switched off after a second period of time after the first capacitor is discharged. The DC/DC convertor is also configured to be switched on after a third period of time after the FET is switched on.
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