| 摘要 |
<p>A battery (30) power supply device provided with an alternating-current power source (10) and a secondary cell connected to the alternating-current power source (10), wherein are provided: a first switch for selectively connecting or cutting off a cell (30) and the alternating-current power source (10), the first switch being provided between the battery (30) and the alternating-current power source (10); and a ground fault sensing means for sensing a ground fault in the battery (30), the ground fault sensing means being connected closer to the battery (30) than the first switch; the ground fault sensing means sensing a ground fault in the battery (30) when the first switch is off.</p> |
