Patent ID: 6657876
Filing Date: 2003-12-02
Classification: H02J,H02M

Abstract:
A switched-capacitor-type stabilized power supply device comprising:an input terminal to which a direct-current voltage is applied; a plurality of voltage step-up circuits each having a different voltage step-up factor; an output-side capacitor that is charged with an output voltage from the voltage step-up circuits; a voltage detecting circuit for detecting a voltage across the output-side capacitor; a control circuit for turning switching devices on and off according to the voltage detected by the voltage detecting circuit; a switching circuit for connecting and disconnecting the input terminal to and from the voltage step-up circuits; and a switching control circuit for controlling the switching circuit according to an input level to and/or an output level from the switched-capacitor-type stabilized power supply device, wherein the voltage step-up circuits each have a capacitor and a switching device, which is turned on and off by the control circuit, and operate by charging and discharging the capacitor through switching operation of the switching device so as to step-up the direct-current voltage and output a stepped-up voltage while the capacitor is discharging.