Patent US4680528A successfully refreshed from Google Patents.
US4680528A
Expired / Lapsed
US
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Battery charging device
Assignee: Toko Inc
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Filing: 1986-03-04
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Granted: 1987-07-14
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Expires: 2006-03-04
Abstract
Abstract A battery charging device which is so designed that whether or not the battery is connected in position can be detected by utilizing a current detecting circuit instead of a mechanically-structured component, such as a switch.
Inventors
- 👤 Toshio Mikami
- 👤 Yasuo Nagasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:57
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/50; H02J7/575; Y; Y10; Y10S; Y10S320/00; Y10S320/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
142 words
A battery charging device, comprising: a DC power source, output terminals for a battery, and a charging-starter switch connected between said DC power source and said output terminals so as to provide DC power at the output terminals by turning on the charging-starter switch; a current detecting circuit connected to the output terminals for detecting whether or not a battery is connnected to the output terminals and for detecting a current flowing to the battery; a voltage control circuit responsive to a signal derived from said current detecting circuit to provide a charging voltage or stand-by voltage of a predetermined magnitude at the output terminals; and a current control circuit responsive to said signal to charge the battery with a current of a predetermined magnitude; said current detecting circuit being OR-connected to said voltage control circuit and to said current control circuit.
Claim 2
Dependent Claim
142 words
A battery charging device, comprising: a DC power source, output terminals for a battery, and a charging-starter switch connected between said DC power source and said output terminals so as to provide DC power at the output terminals by turning on the charging-starter switch; a current detecting circuit connected to the output terminals for detecting whether or not a battery is connnected to the output terminals and for detecting a current flowing to the battery; a voltage control circuit responsive to a signal derived from said current detecting circuit to provide a charging voltage or stand-by voltage of a predetermined magnitude at the output terminals; and a current control circuit responsive to said signal to charge the battery with a current of a predetermined magnitude; said current detecting circuit being OR-connected to said voltage control circuit and to said current control circuit.
Claim 3
Dependent Claim
19 words
A battery charging device according to claim 1, wherein a plurality of pairs of said output terminals are provided.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |