Abstract: A predetermined internal voltage of a charging and discharging conversion unit is monitored by using voltage supervisor circuits of a voltage monitoring unit in response to a drive voltage for a load to operate such that a connection state of a plurality of capacitors included in the conversion unit is converted to a series connection or a parallel connection in a charging mode or a discharging mode, switching of switching elements of the conversion unit is controlled through switching control signals generated corresponding thereto, and thereby, the plurality of capacitors of the conversion unit are connected in series in the charging mode, and the connection state of the plurality of capacitors is converted and connected in the order of an entire parallel connection, a partial series connection, and an entire series connection in response to the drive voltage for the load to be driven in the discharging mode.

Abstract: A predetermined internal voltage of a charging and discharging conversion unit is monitored by using voltage supervisor circuits of a voltage monitoring unit in response to a drive voltage for a load to operate such that a connection state of a plurality of capacitors included in the conversion unit is converted to a series connection or a parallel connection in a charging mode or a discharging mode, switching of switching elements of the conversion unit is controlled through switching control signals generated corresponding thereto, and thereby, the plurality of capacitors of the conversion unit are connected in series in the charging mode, and the connection state of the plurality of capacitors is converted and connected in the order of an entire parallel connection, a partial series connection, and an entire series connection in response to the drive voltage for the load to be driven in the discharging mode.