Remove power source device having improved capacity indication c

Details Remove power source device having improved capacity indication c Remove power source device having improved capacity indication c

1995-06-29

1997-04-29

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

One source floats across or compensates for other source

307 64, 307 66, 320 5, 320 9, 320 30, 320 32, 320 43, 320 48, 320 53, 364483, 364492, H02J 116

Patent

active

056252374

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.

REFERENCES:
patent: 4792743 (1988-12-01), Tsujino et al.
patent: 5422822 (1995-06-01), Toyota et al.

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