Patent US3868559A successfully refreshed from Google Patents.
US3868559A
Expired / Lapsed
US
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Battery charging systems
Assignee: Lucas Electrical Co Ltd
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Filing: 1973-10-25
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Granted: 1975-02-25
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Expires: 1993-10-25
Abstract
Abstract In a battery charging system, the output voltage of the generator is sensed, and if it becomes too low then a nonessential load is disconnected. Preferably, discharge of the battery is anticipated by sensing when the generator is approaching its maximum output.
Inventors
- 👤 William Frank Hill
- 👤 Albert William Winkley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:08
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/1438
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
A battery charging system including a wound-field generator charging a battery, on a voltage regulator, said voltage regulator having a switching device in series with the field winding, together with means sensitive to the voltage of the battery determining the mark-space ratio of said switching device, at least one non-essential load connected across the battery, and means sensitive to the mark-space ratio of said switching device for dis-connecting said non-essential load when the output voltage of the generator falls below a predetermined value.
Claim 2
Dependent Claim
83 words
A battery charging system including a wound-field generator charging a battery, on a voltage regulator, said voltage regulator having a switching device in series with the field winding, together with means sensitive to the voltage of the battery determining the mark-space ratio of said switching device, at least one non-essential load connected across the battery, and means sensitive to the mark-space ratio of said switching device for dis-connecting said non-essential load when the output voltage of the generator falls below a predetermined value.
Claim 3
Dependent Claim
38 words
A system as claimed in claim 1 in which the predetermined value is that At which the generator is producing its maximum output, so that the load is dis-connected at the moment when the battery starts to discharge.
Claim 4
Dependent Claim
27 words
A system as claimed in claim 1 in which the load is dis-connected when the generator is approaching its maximum output, so that battery discharge is anticipated.
Claim 5
Dependent Claim
28 words
A system as claimed in claim 1 in which the load is re-connected when the output voltage of the generator rises to a second and higher predetermined level.
Claim 6
Dependent Claim
18 words
A system as claimed in any claim 1 in which the non-essential load is a rear window demister.
Claim 7
Dependent Claim
31 words
A system as claimed in claim 1 including means for enabling the non-essential load to be energised for a predetermined period of time irrespective of the output voltage of the generator.
Claim 8
Dependent Claim
52 words
A system as claimed in claim 1 including a manually operable switch connected in series with said non-essential load across the battery, and timing means operable when said manually operable switch is closed for energising said load continuously for a predetermined period of time irrespective of the output voltage of the generator.
Claim 9
Dependent Claim
45 words
A system as claimed in claim 7 including temperature-sensitive means measuring the temperature at a predetermined point of the vehicle, and inhibiting means operable if said temperature is below a predetermined value for preventing energisation of the load continuously for said predetermined period of time.
Claim 10
Dependent Claim
65 words
A road vehicle battery charging system including a battery, a generator charging the battery under the control of a voltage regulator, and a rear-window demister formed in two parts, a manually operable switch controlling energisation of one part of said demister, and means for detecting when the voltage of the battery is above a predetermined value, and then energising the other part of the demister.
Claim 11
Dependent Claim
65 words
A road vehicle battery charging system including a battery, a generator charging the battery under the control of a voltage regulator, and a rear-window demister formed in two parts, a manually operable switch controlling energisation of one part of said demister, and means for detecting when the voltage of the battery is above a predetermined value, and then energising the other part of the demister.
References Cited (Backward Citations)
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Cited
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US3474296A
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US3522481A
Cited
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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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |