Patent ID: 8134849

Claim:
An AC to DC power converter using an energy-storage capacitor for providing hold-up time function comprising: a full wave rectifier receiving AC power and rectifying the AC power to sine DC power; a power factor correction (PFC) circuit having an input terminal connected to the full wave rectifier and receiving the sine DC power and comprising an output capacitor; a PFC controller connected to the full wave rectifier and the PFC circuit to obtain a voltage signal and a voltage of the sine DC power, adjusting a voltage phase and a current phase of the sine DC power to be consistent with each other, and regulating the sine DC power to produce a DC voltage on the output capacitor; a switch type DC to DC converter connected to the output capacitor of the PFC circuit, and bucking the DC voltage to produce a low DC voltage; an energy-storage capacitor connected in parallel to the output capacitor through a charging switch, the charging switch being controlled by the PFC controller; and a mode switch connected between the energy-storage capacitor and the input terminal of the PFC circuit.