| 摘要 |
When the charging and discharging of a secondary battery are controlled using one current-pass FET, stable charging and discharging control can be performed by restraining a leakage current to "0." According to a configuration means of the present invention, a source of a pass-on FET is connected to a charger (load) terminal node directly connected to a battery terminal, a drain of the pass-on FET is connected to a gate of the current-pass FET, a gate of the pass-on FET is connected to a first control signal of a controller, a drain of the current-pass FET is connected to the other terminal of a battery, and a source of the current-pass FET is connected to one terminal of a charger. Two pass-off FETs are connected in series between the drain and the gate of the current-pass FET, one of gates of the two pass-off FETs is connected to a second control signal outputted from the controller, the other one of the gates of the two pass-off FETs is connected to a level converter, and an input of the level converter is connected to the second control signal. Two other pass-off FETs are connected in series between the source and the gate of the current-pass FET, and gates of the two other pass-off FETs are connected to a third control signal outputted from the controller. |
