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EP0473514A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Battery charger with temperature detector

Assignee: Sony Corp
•
Filing: 1991-08-28
•
Granted: —
•
Expires: 2011-08-28
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Abstract

Abstract A battery charger (1) for charging a secondary battery (10) has an infrared radiation sensor (7) for detecting the surface temperature of the secondary battery (10) while the secondary battery (10) is being charged. A charging control circuit (6) stops charging the secondary battery (10), typically an Ni-MH battery, when the surface temperature detected by the infrared radiation sensor (7) has reached a predetermined temperature. The battery charger (1) also has a potential detector (8) for detecting an electric potential of the secondary battery (10). The charging control circuit (6) stops charging the secondary battery (10), typically an Ni-Cd battery, when the electric potential detected by the potential detector (8) starts dropping after the battery has fully been charged.

Inventors

  • 👤 Katsutoshi Amano

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 15:46
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/96; H02J7/971; H02J7/975; H02J7/977

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 62 words
A battery charger for charging a secondary battery (10) connected thereto, comprising : temperature detecting means (7) for detecting a surface temperature of a secondary battery (10) while the secondary battery (10) is being charged; and control means (6) for stopping charging the secondary battery (10) when the surface temperature detected by said temperature detecting means (7) has reached a predetermined temperature.
Claim 2
Dependent Claim 18 words
A battery charger according to claim 1, wherein said temperature detecting means (7) comprises an infrared radiation sensor.
Claim 3
Dependent Claim 56 words
A battery charger according to claim 1, further comprising potential detecting means (8) for detecting an electric potential of the secondary battery (10), said control means (6) comprising means for stopping charging the secondary battery (10) when the electric potential detected by said potential detecting means (8) starts dropping after the battery has fully been charged.
Claim 4
Dependent Claim 37 words
A battery charger according to claim 1, further comprising a charging start key (6a), said control means (6) comprising means for starting charging the secondary battery (10) in response to operation of said charging start kay (6a).
Claim 5
Dependent Claim 33 words
A battery charger according to claim 1, further comprising a pilot lamp (9), said control means (6) comprising means for energizing said pilot lamp (9) while the secondary battery (10) is being charged.

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