| 摘要 |
A power-supply apparatus is disclosed, which comprises an input terminal, a signal-detecting circuit which receives a drive power from a battery and which detects a signal input to the input terminal, a constant-current-source circuit which receives a drive power from the battery, which is activated by the signal detected by the signal-detecting circuit and which self-holds an operation state, a main power-supply circuit which receives a drive power from the battery and which operates to output a constant voltage, upon receiving a current from the constant-current-source circuit, and a reset circuit which turns off the constant-current-source circuit upon receiving a reset signal.
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