Patent ID: 9667055
Date: 2017-05-30
CPC Classifications: H02H

Claim:
1. An over-voltage protection apparatus connected to an AC power source and a load, the apparatus comprising: an input voltage detection module, comprising: a switch assembly connected to one terminal of the AC power source; a rectifying circuit connected to the other terminal of the AC power source and the switch assembly, and configured to receive the AC power source and rectify the AC power source to generate a DC voltage; a voltage detection circuit configured to receive the DC voltage and output a voltage signal; and a voltage protection circuit configured to receive the voltage signal and output a first switch signal and a second switch signal; and a second switch connected to the AC power source, the load, and the input voltage detection module; wherein the second switch signal is configured to control the second switch to disconnect the AC power source supplying power to the load when the voltage detection circuit is configured to detect that the DC voltage reaches to a first over voltage value; the first switch signal is configured to control the switch assembly to provide a voltage-limiting protection and a current-limiting protection when the voltage detection circuit is configured to detect that the DC voltage increases to reach to a second over voltage value.