Patent ID: 7397680

Claim:
An AC to DC power conversion circuit for multiple different input voltages, comprising: a first capacitor having first and second terminals; a second capacitor having first and second terminals, the first terminal of the second capacitor coupled to the second terminal of the first capacitor; a bridge rectifier having first and second output terminals, the first output terminal of the bridge rectifier coupled to the first terminal of the first capacitor, the second output terminal of the bridge rectifier coupled to the second terminal of the second capacitor; a switch coupled between an AC input terminal of the bridge rectifier and a terminal comprising the first terminal of the second capacitor and the second terminal of the first capacitor; a first transistor coupled across the first capacitor; a second transistor coupled across the second capacitor, wherein the first and second transistors are coupled to provide a bleed current to the first and second capacitors to balance a leakage current imbalance in the first and second capacitors; and a resistor divider network coupled to generate at least a first input reference and a second input reference, the first input reference greater than the second input reference, the first and second input reference coupled to respective control terminals of the second and first transistors, respectively.