Remove power source device having improved capacity indication capability, and an electronic device using the removable power source device
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United States of America Patent
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Apr 29, 1997
Grant Date -
N/A
app pub date -
Jun 29, 1995
filing date -
Nov 9, 1994
priority date (Note) -
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Abstract
A power source device capable of using both an external DC power source and a battery contained therein, and an electronic device using this power source device. A circuit is provided to measure the battery voltage, to calculate the remaining capacity of the battery and to indicate the remaining capacity. Means is provided which detects the state where no battery is mounted in the power source device, and short-circuits the input side of the battery voltage-measuring circuit. When no battery is mounted, therefore, a voltage leaking from the external DC power source is not erroneously measured as the battery voltage, and the remaining amount of power of the battery is correctly calculated.
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