| 摘要 |
This invention aims at providing a control circuit of power supply in which a secondary battery and a device are connected in parallel, to output capable of preventing over-charging of the secondary battery and supplying power from the secondary battery to the device, and a control method of the power supply. A device 5 G and a secondary battery 2 G are connected to a DC-DC converter 1 G in parallel. The device 5 G is supplied with both a power from the DC-DC converter 1 G and a power from the secondary battery 2 G. When the secondary battery 2 G is in non-charging state, an offset circuit 15 G supplies a positive offset for reducing a difference of voltage between a detection signal Vx 1 G and reference voltage e 1 G to a reference voltage e 1 G corresponding to a charging inhibit signal CAS. An error amplifier ERA 1 G reduces an actually flowing charging current CCG by an amount corresponding to the offset value as a result of recognizing that the charging current CCG flows more by the amount corresponding to the offset value.
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