Patent ID: 8233296

Claim:
A front-end circuit of power converter, comprising: a power connection wiring detecting circuit having a first power connection terminal, a second power connection terminal and a ground terminal, wherein the first power connection terminal and the second power connection terminal are connected with an AC power, the ground terminal is connected to the ground and the power connection wiring detecting circuit detects if the first power connection terminal, the second power connection terminal and the ground terminal are correctly connected with the AC power and the ground and then outputs a detection signal; a power switch connected to the first power connection terminal or the second power connection terminal of the power connection wiring detecting circuit; an AC to DC conversion circuit converting the AC power to a second DC power and then steadily outputting the second DC power to the power switch; and a control unit connected with the power switch and the power connection wiring detecting circuit through an isolation circuit to acquire the detection signal from the power connection wiring detecting circuit to turn on or off the power switch.