| 摘要 |
PURPOSE: A charge and discharge controller is provided to perform a detection of a charge current with an overdischarge protection state being held and the detection of a discharge current with the overcharge protection state being held. CONSTITUTION: An external terminal(+Vo) is connected to the positive voltage side of a secondary battery(101), and the negative voltage side of the secondary battery(101) is connected to an external terminal(-Vo) through a discharging switch(111) and a charging switch(112) of a switching circuit(103). A charge and discharge controlling circuit(110) having the function of detecting a voltage of the secondary battery(101) is connected in parallel with the secondary battery(101). The charge and discharge controlling circuit(110) includes an overcharge detecting circuit(113), an overdischarge detecting circuit(115), an overdischarge current detecting circuit(117), an overcharge current detecting circuit(119), and a control circuit(121).
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