Patent ID: 6972973

Claim:
A voltage booster comprising: a plurality of first diodes connected to each other in series between a voltage input terminal and a voltage output terminal with polarities of the first diodes oriented in the same direction; a plurality of capacitors with one terminal of each of the capacitors connected to a junction point between any two successive ones of the first diodes; a driving circuit for supplying a first voltage and a second voltage as alternating voltages to the other terminal of each of the capacitors alternately, the driving circuit exhibiting a driving performance to generate a voltage at least equal to a predetermined voltage at the voltage output terminal even for a predetermined minimum input voltage supplied to the voltage input terminal with a predetermined load connected to the voltage output terminal; a voltage detection circuit for detecting a voltage supplied to the voltage input terminal; and a driving performance adjustment means for reducing the driving performance of the driving circuit by such a reduction quantity that, the greater a magnitude of the detected voltage, the greater the reduction quantity.