Patent ID: 8248825

Claim:
A power factor control circuit comprising: input nodes for receiving a rectified input voltage, said rectified input voltage being a rectified mains input voltage; a series arrangement of a switch and an inductor arranged between the input nodes; a series arrangement of a rectifier and an output capacitor arranged parallel to the inductor, the rectifier being non-conductive when the switch is closed; and a drive circuit for driving the switch for generating a substantially sinusoidal current through the switch being substantially synchronized with a sinusoidal voltage of the mains input voltage, the drive circuit further receiving a control signal to control an amplitude of the sinusoidal current through the switch for controlling a level of an output voltage of the power factor control circuit, the output voltage being a voltage across the output capacitor, wherein the inductor is a primary winding in a transformer, a secondary winding of the transformer being connected in series with a further rectifier and a further output capacitor for providing an additional output voltage, said addition output voltage being regulated and following the output voltage.