| 摘要 |
A load driving device of the invention includes an electric charge control unit 3, which charges a low-voltage battery 7 with a direct-current voltage from a DC/DC converter 2 that converts a high voltage from a high-voltage battery 1 into a low voltage. The electric charge control unit 3 includes a switching regulator 11 for performing switching of the direct-current voltage from the DC/DC converter 2 varying an output voltage supplied to the low-voltage battery 7, a series regulator 12 for inputting the direct-current voltage from the DC/DC converter 2 and adjusting power consumption to vary an output voltage supplied to the low-voltage battery 7, and a voltage-current detector 13 for detecting a voltage in accordance with a charge ratio of the low-voltage battery 7.
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