BATTERY POWER CIRCUIT

摘要

There is provided a battery power circuit capable of preventing lowering of power supply to a motor at start and obtaining a predetermined engine rpm even if an idle stop operation is performed continuously. The battery power circuit includes a battery (1) connected to a load (not depicted) as an object to which power is supplied, a series-connected power source having a capacitor group (2) connected in series, a DC/DC converter (3) for transferring power between the battery (1) and the capacitor group (2) and between the battery (1) and the load, and a control device (5) for controlling the DC/DC converter (3). The control device (5) detects voltage of the capacitor group (2). If the voltage detected is smaller than a first threshold value (for example, 4.0 V), the capacitor group (2) is charged by the DC/DC converter (3).