Method and apparatus for supplying a power source to an electron

Details Method and apparatus for supplying a power source to an electron Method and apparatus for supplying a power source to an electron

1997-08-18

1998-06-09

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Sequential charging or discharging of batteries or cells

320127, 320135, 320136, H02J 700

Patent

active

057640319

ABSTRACT:
It is intended to realize a power supplying method of an electronic apparatus and its electronic apparatus which can be continuously used for a long time by using both an internal battery and an external battery. A power source is supplied to a video camera by an internal battery 25 and an external battery 13. A voltage of the internal battery 25 is detected by resistors 27 and 35 and a comparator 31. A voltage of the external battery 13 is detected by resistors 13a and 13b. In the case where the external battery 13 is driven and the internal battery 25 is equal to or larger than a predetermined voltage, the driving of the external battery 13 is stopped. At the same time, the internal battery 25 is driven.

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