| 摘要 |
<p>PURPOSE:To prevent the power consumption of a main battery by the charge operation from a main battery to an auxiliary battery after full charge of the main battery by enabling the charge control of the auxiliary battery by the charge control circuit of the main battery thereby putting both in full charge at the same time, at the time of charge to the main battery and the auxiliary battery, in case that the main battery and the auxiliary battery are both discharged. CONSTITUTION:In case that there is no output information from the output monitoring circuit 12 of an auxiliary power source 5, judging that both the main battery 2 and the auxiliary battery 3 are in discharge condition, the auxiliary battery charge control circuit 7 of performs the selection of the charge circuit to the auxiliary battery 3 and the charge control at the time of charge of the main battery by means of the main battery charge control circuit 6 of the main battery 2, for the charge of the auxiliary battery 3. By this constitution, the full charge of the auxiliary battery 3 can be made in the same time, synchronizing with the charge operation of the main battery 2. Moreover, in case that there is output information from the output monitoring circuit 12, an auxiliary battery charge control circuit 7 prevents the overcharge of the auxiliary battery by performing the charge from the auxiliary battery 3 compulsorily with a trickle charge circuit 14 without placing reliance on the main battery charge control circuit 6.</p> |
