| 摘要 |
A charge and discharge circuit and a battery pack, both capable of voluntarily perform proper switching between a charge operation and a discharge operation of a secondary battery according to various situations, are provided. The charge and discharge circuit of a secondary battery is one capable of charging the secondary battery E2 by a power source voltage and of supplying power from the secondary battery E2 to an external device 3. Then, the charge and discharge circuit includes a bidirectional regulator 10 capable of adjusting an output in both of a charge direction of feeding the current to the side of the secondary battery E2 and a discharge direction of feeing the current from the secondary battery E2 to the side of the external device 3, a charge and discharge detecting circuit 20 for detecting a direction of the current flowing in the secondary battery E2, and a switching control circuit 30 for switching the operation direction of the bidirectional regulator 10 based on the detection of the charge and discharge detecting circuit 20.
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