Patent US3593100A successfully refreshed from Google Patents.
US3593100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling a pulsating battery charger
Assignee: Electric Power Storage Ltd
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Filing: 1969-10-02
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Granted: 1971-07-13
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Expires: 1989-10-02
Abstract
Abstract An automatic battery charging circuit employing rectified alternating current includes a capacitor which is connected across the battery by a switching transistor only during the intervals between the pulses of charging current, and a level responsive transistor or trigger circuit, which responds when the voltage across the capacitor exceeds a predetermined value, and then cuts off or reduces the charging current. Thus the duration of the charge (or a phase of it) is determined by the battery voltage during the intervals between pulses of charging current, and is less dependent on battery resistance and temperature than conventional systems.
Inventors
- 👤 George William Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:25
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/96
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
Apparatus for charging a battery from a pulsating supply having terminals for connection to the battery, comprising; a charge control device connected between the supply terminals and said battery terminals for terminating the charging of said battery, a capacitor for sensing the voltage of said battery only during the intervals of said pulsating supply not charging said battery and for controlling said charge control device, and switching means driven by said pulsating supply and conducting only during the intervals between pulses of said supply charging said battery to charge said capacitor.
Claim 2
Dependent Claim
91 words
Apparatus for charging a battery from a pulsating supply having terminals for connection to the battery, comprising; a charge control device connected between the supply terminals and said battery terminals for terminating the charging of said battery, a capacitor for sensing the voltage of said battery only during the intervals of said pulsating supply not charging said battery and for controlling said charge control device, and switching means driven by said pulsating supply and conducting only during the intervals between pulses of said supply charging said battery to charge said capacitor.
Claim 3
Dependent Claim
30 words
Charging apparatus as claimed in claim 1 in which said charge control device includes an impedance, said switching means comprises a transistor having its base-emitter circuit shunted across said impedance.
Claim 4
Dependent Claim
23 words
Charging apparatus as claimed in claim 2 in which said impedance includes a transistor which seRves to terminate the charging of said battery.
Claim 5
Dependent Claim
33 words
Charging apparatus as claimed in claim 2 in which the charging current is half-wave and said impedance further includes a diode serving to provide half-wave rectification of the output of said pulsating supply.
Claim 6
Dependent Claim
31 words
Charging apparatus as claimed in claim 1 in which said charge control device includes a level responsive trigger circuit responsive to the capacitor voltage to terminate the charging of the battery.
Claim 7
Dependent Claim
26 words
Charging apparatus as claimed in claim 1 in which said charge control device includes a current control device for reducing the charging current to said battery.
Claim 8
Dependent Claim
29 words
Charging apparatus as claimed in claim 6 in which said current control device is a single transistor to control the current and to terminate the charging of the battery.
Claim 9
Dependent Claim
53 words
Charging apparatus as claimed in claim 7 in which said current control device includes a resistor connected in series with said transistor and a Zener diode, and said current control device series to compare the drop of voltage across the resistor with that of said Zener diode and to control said transistor accordingly.
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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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |