US3566242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery charging systems
Assignee: ZF International UK Ltd
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Filing: 1968-11-19
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Granted: 1971-02-23
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Expires: 1988-11-19
Abstract
Abstract In a battery charging system in which a DC source, which may itself be a battery, is used to charge the battery, the voltages of both the DC source and the battery can vary, voltage control is effected by turning a switch controlling flow of current from the DC source to the battery on and off for periods of time determined by the voltages of the DC source and battery. The on period of the switch is inversely related to the voltage of one of the sources, and the off period of the switch is directly related to the voltage of the other source.
Inventors
- 👤 Malcolm Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:25
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/02; H02J2207/00; H02J2207/20; Y; Y10; Y10S; Y10S320/00; Y10S320/11
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
A battery charging system for charging a first battery from a second battery, including means for turning a switch controlling current flow from the second battery to the first battery on and off, said means incorporating a timing control sensitive to the voltages of the batteries for maintaining a switch on for a period of time inversely related to the voltage of one of the batteries and for maintaining the switch off for a period of time directly related to the voltage of the battery, so that the voltage to which the first battery is charged is regulated
Claim 2
Dependent Claim
98 words
A battery charging system for charging a first battery from a second battery, including means for turning a switch controlling current flow from the second battery to the first battery on and off, said means incorporating a timing control sensitive to the voltages of the batteries for maintaining a switch on for a period of time inversely related to the voltage of one of the batteries and for maintaining the switch off for a period of time directly related to the voltage of the battery, so that the voltage to which the first battery is charged is regulated
Claim 3
Dependent Claim
36 words
A system as claimed in claim 1 in which the on period is inversely elated to the voltage of the second battery and the off period is directly related to the voltage of the first battery.
Claim 4
Dependent Claim
20 words
A system as claimed in claim 1 including means for ensuring that the off period has a predetermined minimum level.
Claim 5
Dependent Claim
19 words
A system as claimed in claim 1 including means for determining upper and lower liMits for the on period.
Claim 6
Dependent Claim
18 words
A system as claimed in claim 1 including an inductor in series with said switch and the battery.
Claim 7
Dependent Claim
30 words
A system as claimed in claim 5 including a circuit whereby energy stored in the inductor during each on period is utilized to charge the battery during each off period.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |