Patent ID: 7164591

Claim:
A bridgeless PFC boost converter comprising: a boost inductor having a first end connected to a first AC input terminal and a second end connected to a first junction defined between the anode of a first diode and a first terminal of a first switch; a second terminal of the first switch connected to a common line; a parallel circuit of a capacitance and a load connected between the cathode of the first diode and the common line; a series circuit of a second diode and a second switch connected between the cathode of the first diode and the common line; a second AC input terminal connected to a second junction defined between the anode of the second diode and the second switch; and a control integrated circuit connected for controlling the first and second switches so as to provide power factor correction with respect to power applied to said load wherein said first and second switches are MOSFETs, each having a respective body diode whose cathode is connected to the corresponding one of said first and second junction points, wherein said control integrated circuit implements single cycle control wherein said first and second switches are controlled in response to current in said first and second switches and said first and second diodes, said control integrated circuit having as a first input an output of a current sense amplifier having an input comprising a sum of said currents in said first and second switches and said control integrated circuit further having as a second input an output of an error amplifier sensing an output voltage of said converter, said control integrated circuit having outputs coupled to control terminals of each of said first and second switches to implement said power factor correction.