ELECTRONIC APPARATUS AND METHOD FOR CONTROLLING ELECTRONIC APPARATUS

摘要

A power supply comprises a large-capacity capacitor charged with a rectified voltage, a step-up circuit for stepping up the voltage, and an auxiliary capacitor charged with the stepped-up voltage. In a normal mode, step-up magnification of the step-up circuit is adjusted based on the voltage of the large-capacity capacitor, while in a rewrite mode, the magnification is fixed to the maximum magnification. A step-up circuit for generating driving power is used as a pre-stage step-up circuit for a charge-pumping circuit.