Patent ID: 8400797

Claim:
A power conversion system with zero-voltage start-up mechanism, comprising: a power conversion circuit, converting an input voltage received from a power supply, and providing an output voltage to a load; a bridge rectifier, coupled to the power conversion circuit, and rectifying the input voltage; a storage capacitor, coupled to the power conversion circuit, and storing power for powering the load; a storage switching unit, connected with the storage capacitor in series; and a zero-voltage detection module, coupled to the storage switching unit, generating a detection signal responsive to the input voltage, and outputting a control signal to control the turn-on operation of the storage switching unit, accordingly; wherein the zero-voltage detection module generates the control signal to turn on the storage switching unit and begins to have the rectified input voltage charging the storage capacitor when the detection signal indicates the input voltage of the power supply is at zero voltage level so as to suppress the surge current.