Patent ID: 9356471
Filing Date: 2016-05-31
CPC Classification: H02J,H02M

Claim Text:
1. A power supply circuit comprising: a voltage conversion module electrically connected to a first power supply; and an under voltage protection module comprising: wherein in response to a voltage of the first power supply being in a normal range, a voltage at the inverting terminal of the comparator is greater than the reference voltage, the output terminal of the comparator outputs a low-level signal, the first electronic switch is turned on, the voltage conversion module is powered by the second power supply through the first electronic switch, and the voltage conversion module converts the voltage of the first power supply into an operational voltage and outputs the operational voltage; and wherein in response to the voltage of the first power supply being less than a threshold voltage, the voltage at the inverting terminal of the comparator is less than the reference voltage, the output terminal of the comparator outputs a high-level signal, the first electronic switch is turned off, and the voltage conversion module does not operate.