US3683256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-current apparatus for charging batteries
Assignee: Individual
•
Filing: 1970-10-23
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Granted: 1972-08-08
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Expires: 1990-10-23
Abstract
Abstract A battery charger for charging a battery by a high current under acceptance current control. The battery is periodically discharged by high-magnitude, small-width pulses to increase the acceptance current level. The discharge pulser includes two SCR''s connected across the battery. The discharge pulse is initiated by turning on the first SCR. A first capacitor then functions to turn on the second SCR and a second capacitor, when the second SCR turns on, causes the first SCR to turn off. The first capacitor then charges to control the automatic turn-off of the second SCR.
Inventors
- 👤 Joseph A Mas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:55
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/971; H02J7/973
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
162 words
A battery charger for charging a battery comprising a charging source for delivering current to said battery, and means for periodically discharging said battery while it is being charged from said charging source, said discharging means including first current switch means connected across said battery for selectively conducting large currents from said battery, means for turning on said first current switch means, second current switch means connected across said battery for selectively conducting large currents from said battery, and means responsive to the turning on of said first current switch means for controlling the turning on of said second current switch means, the turning off of said first current switch means, and thereafter the turning off of said second current switch means, said controlling means including a first capacitor connected in series with said first current switch means, a second capacitor connected in series with said second current switch means, and impedance means interconnected between said first and second current switch means.
Claim 2
Dependent Claim
162 words
A battery charger for charging a battery comprising a charging source for delivering current to said battery, and means for periodically discharging said battery while it is being charged from said charging source, said discharging means including first current switch means connected across said battery for selectively conducting large currents from said battery, means for turning on said first current switch means, second current switch means connected across said battery for selectively conducting large currents from said battery, and means responsive to the turning on of said first current switch means for controlling the turning on of said second current switch means, the turning off of said first current switch means, and thereafter the turning off of said second current switch means, said controlling means including a first capacitor connected in series with said first current switch means, a second capacitor connected in series with said second current switch means, and impedance means interconnected between said first and second current switch means.
Claim 3
Dependent Claim
121 words
A battery charger in accordance with claim 1 wherein said first and second current switch means are silicon controlled rectifiers, said first capacitor is connected between the positive terminal of said battery and the anode of said first silicon controlled rectifier, said second capacitor is connected between the cathode of said second silicon controlled rectifier and the negative terminal of said battery, the cathode of said first silicon controlled rectifier being connected to the negative terminal of said battery and the anode of said second silicon controlled rectifier being connected to the positive terminal of said battery, and said impedance means is connected between the anode of said first silicon controlled rectifier and the cathode of said second silicon controlled rectifier.
Claim 4
Dependent Claim
42 words
A battery charger in accordance with claim 2 wherein said means for turning on said first silicon controlled rectifier includes means for developing a potential at the gate thereof to turn it on responsive to the generation of gas in said battery.
Claim 5
Dependent Claim
47 words
A battery charger in accordance with claim 3 wherein said means for turning on said first silicon controlled rectifier includes pressure transducer means for developing an increased potential at the gate of said first silicon controlled rectifier responsive to an increase in gas pressure in said battery.
Claim 6
Dependent Claim
139 words
A battery charger in accordance with claim 4 wherein at the end of each operation of said discharging means said second capacitor is charged to a high level to prevent conduction of said second silicon controlled rectifier, the turning on of said first silicon controlled rectifier functioning to allow said second capacitor to discharge through said impedance means and said first silicon controlled rectifier thereby allowing said second silicon controlled rectifier to turn on when the voltage across said second capacitor has discharged to a minimum value, and further including a third capacitor connected to the gate circuit of said second silicon controlled rectifier for delaying the turning on of said second silicon controlled rectifier until a time after the time when said second silicon controlled rectifier would turn on responsive only to the discharge of said second capacitor.
Claim 7
Dependent Claim
135 words
A battery charger in accordance with claim 1 wherein at the end of each operation of said discharGing means said second capacitor is charged to a high level to prevent conduction of said second current switch means, the turning on of said first current switch means functioning to allow said second capacitor to discharge through said impedance means and said first current switch means thereby allowing said second current switch means to turn on when the voltage across said second capacitor has discharged to a minimum value, and further including a third capacitor connected to said second current switch means for delaying the turning on of said second current switch means until a time after the time when said second current switch means would turn on responsive only to the discharge of said second capacitor.
Claim 8
Dependent Claim
43 words
A battery charger in accordance with claim 1 wherein said means for turning on said first current switch means includes means for developing a potential at a control terminal thereof to turn it on responsive to the generation of gas in said battery.
Claim 9
Dependent Claim
47 words
A battery charger in accordance with claim 1 wherein said means for turning on said first current switch means includes pressure transducer means for developing an increased potential at the control terminal of said current switch means responsive to an increase in gas pressure in said battery.
Claim 10
Dependent Claim
43 words
A battery charger in accordance with claim 1 wherein said means for turning on said first current switch means includes means for developing a potential at a control terminal thereof to turn it on responsive to the generation of gas in said battery.
Claim 11
Dependent Claim
48 words
A battery charger in accordance with claim 1 wherein said means for turning on said first current switch means includes pressure transducer means for developing an increased potential at the control terminal of said first current switch means responsive to an increase in gas pressure in said battery.
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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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |