Charging-and-discharging device, constant-voltage and constant-current control circuit, and electronic device

Patent 5905361 Issued on May 18, 1999. Estimated Expiration Date:

January 17, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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5847775

Inventors

Application

No. 786363 filed on 01/17/1997

US Classes:

320/119, With individual charging of plural batteries or cells320/122Bypassable battery cell

Examiners

Primary: Tso, Edward H.

Attorney, Agent or Firm

Nikaido, Marmelstein, Murray & Oram LLP

Foreign Patent References

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International Class

H01M 10//46

Foreign Application Priority Data

1994-09-01 JP

Abstract

A charging-and-discharging device in an electronic apparatus includes a rechargeable battery and a charging device for charging the battery. The charging-and-discharging device includes a switching circuit electrically isolating one terminal side of the battery from a ground side of the electronic apparatus. The charging-and-discharging device further includes a charge control section controlling the isolating of the one terminal side of the battery from the ground side of the electronic apparatus by turning off the switching circuit during charging of the battery. In the charging-and-discharging device, the one terminal side of the battery is isolated from the ground side of the electronic apparatus by the switching circuit during charging of the battery and a closed loop including the charging device and the battery is established to charge the battery.