| 摘要 |
<p>During the charging of an electronic device (11), a first control unit (2) is usually in the low-power consumption state, and the first control unit (2) makes the transition to the normal state every predetermined time to discriminate the charging state of the electronic device through a second control unit (3). When the electronic device (11) is still being charged, the first control unit (2) repeats an operation for returning to the low-power consumption state. Accordingly, the power consumption of the first control unit (2) can be reduced during the charging of the electronic device (11).
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