Patent ID: 9419433
Filing Date: 2016-08-16
CPC Classification: H02H

Claim Text:
1. A power supply apparatus comprising: a power conversion circuit configured to provide a DC output voltage to a load in response to an output pulse-width-modulation signal; a control chip with soft-start function and coupled to the power conversion circuit, the control chip being operated under a DC input voltage, and configured to generate the output pulse-width-modulation signal to control an operation of the power conversion circuit; and a short protection circuit comprising a hardware switch coupled to a soft-start pin of the control chip, wherein the short protection circuit is configured to: pull-down a level of the soft-start pin of the control chip through the hardware switch in response to a short-circuit of the load, so as to substantially reduce a frequency and a duty cycle of the output pulse-width-modulation signal, and then substantially reduce a current flowing through the shorted load.