Patent ID: 8456404

Claim:
A voltage boosting power supply circuit, comprising: an output node which outputs an output voltage to a load circuit; a voltage boosting capacitor; a first switch which applies a first voltage to said voltage boosting capacitor, to charge said voltage boosting capacitor; a second switch which connects a second voltage serially to said voltage boosting capacitor to boost a charging voltage of said voltage boosting capacitor; a third switch which discharges a boosted charging voltage of said voltage boosting capacitor, an end of said third switch being coupled between said voltage boosting capacitor and said first switch, another end of said third switch being coupled to said output node; an extraction switch which has one end coupled between said voltage boosting capacitor and the third switch, and is controlled according to charging said voltage boosting capacitor to extract said charging voltage of said voltage boosting capacitor; an addition comparison circuit which couples to another end of said extraction switch, and compares, a sum of said charging voltage of said voltage boosting capacitor and said second voltage, with a predetermined threshold value to generate a result of said comparison; and a control circuit which controls an on/off state of said first switch according to said result of comparison during said charging said voltage boosting capacitor.