Patent ID: 8854839

Claim:
A power converting device for converting an AC input voltage supplied by an external power source into a DC output voltage, comprising: a filter adapted to be coupled to the external power source for filtering the AC input voltage therefrom to eliminate high-frequency noises; a rectifier having an input side coupled to said filter for receiving the AC input voltage filtered by said filter, and an output side, said rectifier rectifying the AC input voltage received at the input side to output a rectified voltage at said output side; a power factor corrector for receiving the rectified voltage from said rectifier to generate a boosted voltage, said power factor corrector including first and second capacitors connected in a series connection that is coupled directly to and across said output side of said rectifier, a first series connection of a first diode and a first inductor coupled to said first capacitor, a second series connection of a second diode and a second inductor coupled to said second capacitor, a third capacitor coupled between said first and second series connections, and first and second switches connected in series across said third capacitor, said first switch being coupled to said first series connection, said second switch being coupled to said second series connection, a common node between said first and second switches being coupled directly to a common node between said first and second capacitors, each of said first and second switches being operable between an ON-state and an OFF-state, said first and second switches being operated alternately in the ON-state based on first and second control signals, when one of said first and second switches is in the ON-state, the other one of said first and second switches being in the OFF-state, a voltage across said second switch serving as the boosted voltage; and a step-down converter coupled to said power factor corrector for receiving the boosted voltage therefrom to output the DC output voltage, wherein said first diode has a cathode and an anode that is coupled to said first capacitor, said first inductor is coupled directly between said cathode of said first diode and said first switch, said second diode has an anode and a cathode that is coupled to said second capacitor, and said second inductor is coupled directly between said anode of said second diode and said second switch.