US3748567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage battery charging device
Assignee: Sansha Electric Manufacturing Co Ltd
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Filing: 1972-10-19
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Granted: 1973-07-24
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Expires: 1992-10-19
Abstract
Abstract A battery charger having means for measuring the quantity of energy imparted to a battery before the reversing point of the charge at which there is a sudden, step-like change in voltage, and then imparting a quantity of energy to the battery which constitutes a selected proportion of the energy imparted before the reversing point. The means for measuring the quantity of energy imparted comprise a variable frequency pulse generator and a reversible counter with the step-like change in voltage changing the frequency of the pulse generator and changing the mode of operation of the reversible counter from addition to subtraction; the charging operation is interrupted when the counter has counted down to zero.
Inventors
- 👤 H Arai
- 👤 Y Komuro
- 👤 A Kasai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:45
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/94; Y; Y02; Y02B; Y02B40/00; Y02E; Y02E60/00; Y02E60/10; Y02E60/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
161 words
A storage battery charging device comprising an a.c. source, a battery charger for rectifying the a.c. current from said a.c. source and supplying a rectified current to a storage battery to be charged, a voltage comparator for comparing the terminal voltage of said battery with the characteristic reversing voltage of said battery and producing a detection signal when the terminal voltage exceeds the reversing voltage, a pulse generator having at least two characteristic frequencies which can be switched in response to said detection signal from the voltage comparator, a reversible counter for counting the pulses generated from said pulse generator, said reversible counter being arranged to change the mode of operation from addition to subtraction in response to the detection signal of the voltage comparator and produce a zero count signal when the count reaches zero, and a battery charger control for interrupting the charging operation of the battery charger in response to the zero count signal from the reversible counter.
Claim 2
Dependent Claim
161 words
A storage battery charging device comprising an a.c. source, a battery charger for rectifying the a.c. current from said a.c. source and supplying a rectified current to a storage battery to be charged, a voltage comparator for comparing the terminal voltage of said battery with the characteristic reversing voltage of said battery and producing a detection signal when the terminal voltage exceeds the reversing voltage, a pulse generator having at least two characteristic frequencies which can be switched in response to said detection signal from the voltage comparator, a reversible counter for counting the pulses generated from said pulse generator, said reversible counter being arranged to change the mode of operation from addition to subtraction in response to the detection signal of the voltage comparator and produce a zero count signal when the count reaches zero, and a battery charger control for interrupting the charging operation of the battery charger in response to the zero count signal from the reversible counter.
Claim 3
Dependent Claim
41 words
A storage battery charging device according to claim 1 wherein said pulse generator includes a variable frequency pulse generator for detecting the current flowing through said battery to modify said characteristic frequencies, whereby said frequencies are always proportional to said current.
Claim 4
Dependent Claim
58 words
A storage battery charging device according to claim 1 wherein the ratio of the characteristic frequencies of said pulse generator produced before and after the application of said detection signal is established as 2, whereby a charge of half of the quantity of energy charged before said detection signal is imparted to the battery after said detection signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |