| 摘要 |
This invention provides a facsimile apparatus which can reduce the consumption power of main power supply control means, and can suppress the charging frequency of a secondary battery without widening the operating voltage range of the main power supply control means. The facsimile apparatus has a main power supply control unit. The main power supply control unit has a DC-DC converter which receives a power from a secondary battery, a solar battery, or a main power supply, and operates to maintain a constant output voltage, and a microcomputer driven by the output voltage from the DC-DC converter. The output voltage from the DC-DC converter is detected by a voltage detect circuit, and a voltage from the secondary battery is detected by another voltage detect circuit. The microcomputer performs control for supplying a power from the secondary battery or the solar battery to the DC-DC converter, control for charging the secondary battery by the main power supply or the solar battery, and the like.
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