Abstract: Disclosed is a power supply which includes a transformer having a primary winding and a secondary winding. A rectifier circuit rectifies an input AC mains signal to produce a DC rectified mains signal. A power factor correction circuit transfers electrical power from the rectifier circuit to the primary winding. A switch is provided for transferring electrical power from the primary winding to the secondary winding. The power factor correction circuit includes a first diode having an anode connected to the rectifier circuit and a cathode connected to one end of the primary winding and a second diode having an anode connected to the rectifier circuit and a cathode connected to said one end of the primary winding via a snubber network. The correction circuit may also include a third diode having an anode connected to the rectifier circuit and a cathode connected to a second end of the primary winding via an inductor.