| 摘要 |
PROBLEM TO BE SOLVED: To provide a means that makes it possible to prevent damage to a battery due to charging of an internal battery by an external battery or an erroneous connection of the internal battery and to lengthen the battery life when the internal battery and the external battery are used in parallel. SOLUTION: A diode D1 is placed between the (-) terminal 3b of an internal battery 1 and ground in the forward direction of the battery. A diode short-circuit circuit 4 is provided in parallel with this diode D1. A reverse connection detection circuit 7 is provided for detecting the voltage across the diode D1. When the reverse connection detection circuit 7 detects that the voltage across the diode D1 is equal to lower than a predetermined voltage value, it determines the connection of the internal battery to be correct. The diode short-circuit circuit 4 is controlled to short-circuit both ends of the diode D1 and bring a load circuit 11 into an operating state. COPYRIGHT: (C)2009,JPO&INPIT
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