| 摘要 |
<p>The invention provides a power supply device comprising a high voltage battery and a low voltage battery, wherein the low voltage battery is charged by the high voltage battery and the durability of the charging voltage for the low voltage battery directly applied to an auxiliary machine is prevented from decreasing. A voltage charging auxiliary battery (5) is provided when the voltage is lowered by a buck converter (6). The charging voltage conducted by a main switch (9) is applied to a lighting device (27) and a headlamp (25). The headlamp (25) is grounded by FET (11 or 11a). The current supplied by the headlamp (25) is limited to be the rated current by FET (11 or 11a) driven by a low duty ratio. The current flowing through the headlamp (25) can also be lowered by the voltage drop of a diode (D1) or (D2). FET (11 or 11 a) or the diode (D1, D2) can be installed on the substrate of PDU (45) or the buck converter (6).</p> |
