VOLTAGE PROTECTION CIRCUIT

摘要

A voltage protection circuit includes a first power source, a power circuit, a comparator, and a electronic switch. The power circuit provides an output voltage to the comparator. The comparator compares the output voltage with a reference voltage. The electronic switch controls the power circuit according to the comparison. When the output voltage is larger than the reference voltage, the electronic switch controls the power circuit to stop providing the output voltage.

主权项

1. A voltage protection circuit comprising:
a power circuit and comprising a control pin and a output terminal; a reference voltage circuit outputting a reference voltage; a comparator comprising a non-inverting input terminal connected to the output terminal of the power circuit, an inverting input terminal receiving the reference voltage, and an output terminal; and a first electronic switch comprising a first terminal connected to the output terminal of the comparator, a second terminal connected to the control pin of the power circuit, and a third terminal; wherein when the output terminal of power circuit is lower than the reference voltage, the electronic switch is turned off, the control pin receives a high level signal, the power circuit outputs a stable working voltage to power electronic components; when the output terminal of power circuit is higher than the reference voltage, the electronic switch is turned on, the control pin receives a low level signal, and the power circuit stops outputting voltage.