Patent ID: 7679213

Claim:
An AC to DC converter circuit for providing at least two pairs of DC outputs from an AC power supply, comprising: a pair of AC input terminals; at least two pairs of DC output terminals including a first pair of DC output terminals and a second pair of DC output terminals; at least two switching devices including first and second switching devices, the at least two switching devices being connected in parallel with each other between the AC input terminals; first and second diodes, the first switching device being connected via the first diode between the first pair of DC output terminals, and the second switching device being connected via the second diode between the second pair of DC output terminals; an input voltage detector for detecting an AC voltage between the pair of AC input terminals; an output voltage error amplifier for detecting a DC voltage between one terminal of the first pair of DC output terminals and one terminal of the second pair of DC output terminals and outputting an error voltage based on a voltage difference between the detected DC voltage and a predetermined reference voltage; and a multiplier circuit for multiplying the detected AC voltage by the error voltage and outputting a control signal, wherein the at least two switching devices are controlled on the basis of the control signal.