Patent ID: 8711592

Claim:
A power supply comprising: a transformer having a primary winding that receives an alternating current input voltage and a secondary winding which produces an alternating current output voltage; a rectifier connected to receive the alternating current output voltage from the secondary winding of the transformer and producing a rectified output voltage; a capacitor connected to receive the rectified output, a resulting voltage on the capacitor defining an output voltage of the power supply; a switch connected such that, when in a closed position, the switch shorts the secondary winding and causes energy to be stored in the primary and secondary leakage reactances of the transformer, and when in an open position, allows the stored energy in the primary and secondary leakage reactances to pass through the rectifier to the capacitor; and a controller that opens and closes the switch at a duty cycle and frequency that develops a quasi-sinusoidal current being drawn from the alternating current input voltage.