US4311952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery charging system
Assignee: Mabuchi Motor Co Ltd
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Filing: 1976-03-22
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Granted: 1982-01-19
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Expires: 1996-03-22
Abstract
Abstract A battery charging system designed to charge a battery, especially a nickel-cadmium (Ni-Cd) battery from a lead acid power supply without overcharging, and to charge uniformly a plurality of batteries in parallel. A non-linear resistance is utilized and is matched to the voltage difference of the power supply battery and the batteries being charged.
Inventors
- 👤 Kenichi Mabuchi
- 👤 Kogiro Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:36
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/50; H02J7/575; H02J7/60; H02J7/61; H02J7/65; H02J7/663; H02J7/34; H02J7/342; Y; Y10; Y10S; Y10S320/00; Y10S320/22; Y10S323/00; Y10S323/906
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
A battery charging system for charging a Ni-Cd battery having a predetermined number of individual Ni-Cd cells comprising, a lead acid power supply battery having an identical predetermined number of individual lead-acid cells, whose battery terminal voltage is higher than the charging completion voltage of the Ni-Cd battery to be charged, and non-linear resistance elements only connected in series between said power supply battery and the battery to be charged, the total threshold voltage of said elements being approximately equal to the voltage difference between the terminal voltage of the power supply battery and the charging completion voltage of the battery to be charged; wherein the batteries to be charged are charged from the power supply battery via the non-linear resistance element to provide a constant-voltage charge across the batteries without overheating or overcharging.
Claim 2
Dependent Claim
134 words
A battery charging system for charging a Ni-Cd battery having a predetermined number of individual Ni-Cd cells comprising, a lead acid power supply battery having an identical predetermined number of individual lead-acid cells, whose battery terminal voltage is higher than the charging completion voltage of the Ni-Cd battery to be charged, and non-linear resistance elements only connected in series between said power supply battery and the battery to be charged, the total threshold voltage of said elements being approximately equal to the voltage difference between the terminal voltage of the power supply battery and the charging completion voltage of the battery to be charged; wherein the batteries to be charged are charged from the power supply battery via the non-linear resistance element to provide a constant-voltage charge across the batteries without overheating or overcharging.
Claim 3
Dependent Claim
29 words
A battery charging system set forth in claim 1, wherein the power supply battery is charged in the floating condition by means of a constant voltage D-C power supply.
Claim 4
Dependent Claim
20 words
A battery charging system set forth in claim 1 wherein the non-linear resistance element is at least one semiconductor diode.
Claim 5
Dependent Claim
28 words
A battery charging system as in claim 3 and wherein said semiconductor diode is a germanium diode and there is included one germanium diode for each individual cell.
Claim 6
Dependent Claim
21 words
A battery charging system as in claim 3 and wherein there is included a silicon diode for each two individual cells.
Claim 7
Dependent Claim
28 words
A battery charging system as in claim 1 wherein batteries to be charged are charged only through the non-linear resistance element without the use of a linear resistor.
Claim 8
Dependent Claim
30 words
A battery charging system as in claim 1 and further including a plurality of substantially identical Ni-Cd batteries connected in parallel and being charged by said lead-acid power supply battery.
References Cited (Backward Citations)
US979155A
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GB604094A
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FR1212533A
Cited
US3086160A
Cited
US3148322A
Cited
US3393355A
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US3484659A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-18 | 1985-07-20 | 1986-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-18 | 1989-07-20 | 1990-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-18 | 1993-07-20 | 1994-01-19 | $7700.00 | Window Closed / Lapsed |