A high-capacity capacitor for regenerative power charging and a medium-capacitance capacitor are used separately, and power transfer between the capacitors is performed by a power supply signal for supplying a load current or a regenerative signal for performing regenerative braking, and a booster circuit is provided. Combined use of regenerative power. An ACDC converter, a booster, a secondary battery, a first capacitor that is output from the ACDC converter and charges and discharges regenerative power boosted by the booster, and is discharged from the first capacitor and boosted. A pair of second capacitors that charge and discharge the regenerative power boosted by the unit, and between the ACDC converter and the booster, and between the booster and the first capacitor, and are turned on when a regenerative signal is input A first switching element, and a pair of second switching elements that are disposed between the first capacitor and the boosting unit, and between the boosting unit and the second capacitor and that are turned on when a power feeding signal is input, are provided. [Selection] Figure 1
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