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EP0340794A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Portable apparatus with variable rating battery charger for recharging interchangeable battery packs

Assignee: NEC Corp
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Filing: 1989-05-05
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Granted: —
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Expires: 2009-05-05
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Abstract

Abstract In a portable radio telephone apparatus, a desired one of interchangeable battery packs (2) is mounted. Each battery pack (2) contains a rechargeable battery (24) of a particular ampere-hour rating and a switch (23) for identifying the ampere-hour rating of the battery being used. In one em­bodiment, multiple charging circuits (31, 32) are selectively connected to the battery in accordance with the identification given by the switch for charging it with a current that is optimum for the battery's ampere-hour rating. In another embodiment, the charging circuit includes a switching regulator circuit for generating a charging voltage that can be varied in accordance with a control signal applied thereto. The control signal is derived by detecting a difference between the charging voltage and a reference voltage. The switching regulator controls the charging voltage so that the voltage difference reduces to zero.

Inventors

  • 👤 Mituru C/O Nec Corporation Tanaka

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 20:15
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/50; H02J7/575; H02J7/40; H02J7/443; H02J7/485

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 53 words
A portable apparatus in which one of a plurality of inter­changeable battery packs is mounted, said battery packs respectively containing rechargeable batteries of different ampere-hour ratings, comprising means for charging the battery of said mounted battery pack with an optimum current that is determined by the ampere hour rating of the charged battery.
Claim 2
Dependent Claim 53 words
A portable apparatus in which one of a plurality of inter­changeable battery packs is mounted, said battery packs respectively containing rechargeable batteries of different ampere-hour ratings, comprising means for charging the battery of said mounted battery pack with an optimum current that is determined by the ampere hour rating of the charged battery.
Claim 3
Dependent Claim 71 words
A portable apparatus as claimed in claim 1, wherein each of said interchangeable battery packs includes means for identifying the ampere hour rating of the battery contained therein, and wherein said charging means includes a plurality of charging circuits selectively connected to said battery of the mounted pack in response to said identifying means, each of said charging circuits generating different currents respectively in accordance with said different ampere hour ratings.
Claim 4
Dependent Claim 97 words
A portable apparatus as claimed in claim 1, wherein each of said interchangeable battery packs includes means for identifying the ampere-hour rating of the battery contained therein, and wherein said charging means includes: means for deriving a variable voltage from an external voltage in accordance with a control signal applied thereto and supplying said variable voltage to the battery of said mounted pack; and means for detecting a difference between said variable voltage and a reference voltage and applying said difference as said control signal to said deriving means so that said difference reduces substantially to zero.
Claim 5
Dependent Claim 20 words
A portable apparatus as claimed in any of claims 1 to 3, wherein said apparatus is a radio telephone apparatus.

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