US4418310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery charger control circuit
Assignee: Prestolite Electric Inc
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Filing: 1981-11-18
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Granted: 1983-11-29
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Expires: 2001-11-18
Abstract
Abstract An automatic battery charging apparatus is provided with a regulated battery charger (15) and a control circuit (20) for monitoring the actual voltage across the battery terminals to control the operation of contactor (25). The control circuit includes means (50) for sensing the average battery voltage at regular intervals and means (55, 60) for comparing successive average battery voltage readings. Whenever the present average voltage reading differs from the previous average battery voltage reading by less than a predetermined amount, a signal (63) is applied to a circuit (65), and whenever a predetermined number of consecutive voltage readings have been detected, a logic circuit (70) causes the contactor (25) to terminate the charging operation.
Inventors
- 👤 David D. Bollinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:18
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/96; H02J7/963; Y; Y10; Y10S; Y10S320/00; Y10S320/13; Y10S320/25
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
An automatic battery charging apparatus including, means for providing a source of regulated electrical current for charging a battery, means for sensing the battery voltage at regular intervals, said means including an analog to digital converter providing a digital output representative of average battery voltage taken over a predetermined period of time, means for comparing successive average battery voltage readings, means responsive to a predetermined number of consecutive comparisons where the present battery average differs from the previous average battery voltage by less than a predetermined amount for generating a control signal, and means responsive to said control signal for disconnecting said source of charging current from said battery.
Claim 2
Dependent Claim
109 words
An automatic battery charging apparatus including, means for providing a source of regulated electrical current for charging a battery, means for sensing the battery voltage at regular intervals, said means including an analog to digital converter providing a digital output representative of average battery voltage taken over a predetermined period of time, means for comparing successive average battery voltage readings, means responsive to a predetermined number of consecutive comparisons where the present battery average differs from the previous average battery voltage by less than a predetermined amount for generating a control signal, and means responsive to said control signal for disconnecting said source of charging current from said battery.
Claim 3
Dependent Claim
43 words
The battery charging apparatus of claim 1 wherein said analog to digital converter comprises a voltage to frequency converter, a frequency divider, and a binary counter, whereby a digital output is provided from said binary counter taken over a predetermined interval of time.
Claim 4
Dependent Claim
129 words
An electrical circuit for controlling the operation of a regulated battery charger in response to the state of actual charge of a battery, including means for sensing voltage of the battery at regular intervals including an analog to digital converter providing a digital output representative of average battery voltage taken over a predetermined period of time, means for storing the digital representation of the previous average battery voltage, means for comparing the present average battery voltage with the previous average battery voltage, means responsive to a predetermined number of consecutive comparisons where the present battery average differs from the previous average battery voltage by less than a predetermined amount for generating a control signal, and means responsive to said control signal for disconnecting said battery charger from said battery.
Claim 5
Dependent Claim
129 words
An electrical circuit for controlling the operation of a regulated battery charger in response to the state of actual charge of a battery, including means for sensing voltage of the battery at regular intervals including an analog to digital converter providing a digital output representative of average battery voltage taken over a predetermined period of time, means for storing the digital representation of the previous average battery voltage, means for comparing the present average battery voltage with the previous average battery voltage, means responsive to a predetermined number of consecutive comparisons where the present battery average differs from the previous average battery voltage by less than a predetermined amount for generating a control signal, and means responsive to said control signal for disconnecting said battery charger from said battery.
Claim 6
Dependent Claim
32 words
The control circuit of claim 3 wherein said predetermined interval of time is in excess of one minute, and wherein said consecutive comparisons is at least three before generating a control signal.
References Cited (Backward Citations)
US3098188A
Cited
US3424969A
Cited
US3617851A
Cited
US3794905A
Cited
US3895282A
Cited
US3886428A
Cited
US4091320A
Cited
US4240021A
Cited
US4191918A
Cited
US4227141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |