Patent ID: 6950319

Claim:
A flyback converter with input-current shaping and output-voltage regulation, comprising: a first bridge rectifier coupled to receive an AC power supply voltage and having an output terminal providing a first rectified voltage; an energy-storage inductor coupled to receive the first rectified voltage from the first bridge rectifier; a second bridge rectifier coupled to receive the AC power supply voltage and having an output terminal providing a second rectified voltage; an energy-storage capacitor coupled to receive the second rectified voltage from the second bridge rectifier; a transformer having a primary winding including a tap that divides the primary winding into a first portion and a second portion; said tap of the primary winding coupled to the energy storage inductor, and said second portion of the primary winding coupled to the energy-storage capacitor; and a switch switchably coupling the first portion of the primary winding of the transformer to a ground terminal.