Patent ID: 7365592

Claim:
A power supply circuit comprising: a plurality of capacitors including a first capacitor and a second capacitor, each having first and second terminals; first and second selecting sections, each including a plurality of switching members; and a power supply comprising a plurality of power terminals which respectively output a plurality of voltages including first, second and third voltages; wherein the first selecting section alternately selects the first and second voltages as a voltage to be applied to the first terminal of the first capacitor; wherein the second selecting section alternately selects the power terminal outputting the third voltage to be connected to the second terminal of the first capacitor, and the first terminal of the second capacitor to be connected to the second terminal of the first capacitor; and wherein the second selecting section comprises a sub-section for inserting a first resistor between the second terminal of the first capacitor and the power terminal outputting the third voltage during a current limiting period immediately after application of the voltage to the first capacitor is started, and for directly connecting the second terminal of the first capacitor and the power terminal outputting the third voltage after the current limiting period has passed.