Patent ID: 8098468

Claim:
A hardware overvoltage disconnecting circuit, comprising: a disconnecting relay in series between an AC power network and a power factor correction circuit of a power supply module; and a voltage detection circuit; wherein a first sampling terminal of the voltage detection circuit samples the voltage of the AC power network between the AC power network and the disconnecting relay, and an output of the voltage detection circuit is connected to a control terminal of the disconnecting relay; further wherein when the AC power network is in a state of overvoltage, the disconnecting relay disconnects the power supply module from the AC power network; when the voltage of the AC power network is normal, the disconnecting relay connects the power supply module and the AC power network; and wherein the voltage detection circuit further comprises a second sampling terminal for sampling a voltage of a DC busbar of the power supply module, further wherein when the AC power network and the DC busbar are both in the state of overvoltage, the disconnecting relay disconnects the power supply module from the AC power network; when the voltages of the AC power network; and the DC busbar are both normal, the disconnecting relay connects the power supply module and the DC power network.