Title:
【発明の名称】電源回路及び電池装置
Document Type and Number:
Japanese Patent JP3372376
Kind Code:
B2
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.
Inventors:
Mitsuo Saeki
Masashi Okumura
Hidekiyo Ozawa
Masashi Okumura
Hidekiyo Ozawa
Application Number:
JP27473994A
Publication Date:
February 04, 2003
Filing Date:
November 09, 1994
Export Citation:
Assignee:
富士通株式会社
International Classes:
H02J7/00; H02J7/34; H02J9/00; H02J9/06; (IPC1-7): H02J7/00; H02J7/34
Domestic Patent References:
| JP424567A | ||||
| JP311937A | ||||
| JP63110918A |
Attorney, Agent or Firm:
Kazuo Hosaka (2 outside)