US3863129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery charger
Assignee: Individual
•
Filing: 1973-02-16
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Granted: 1975-01-28
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Expires: 1993-02-16
Abstract
Abstract In a battery charger wherein a battery is charged by a pulsating current, a control circuit is provided for controlling the charging current of the battery in accordance with the result of an intermittent comparison of an open terminal voltage of the battery with a reference voltage at a period identical with that of the pulsating current. The reference voltage is varied in accordance with the charging condition of the battery by controlling the reference voltage in accordance with the detected AC component of the charging current.
Inventors
- 👤 Hiroyuki Yamauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:52
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/96; Y; Y10; Y10S; Y10S320/00; Y10S320/11
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
280 words
A battery charger comprising: power supply means including an AC power source and rectifier means for producing voltage pulses, switching means connected to said power supply means in series with a battery to be charged and having conductive and nonconductive states for supplying a charging current to the battery only when said switching means is in said conductive state, control circuit means connected to said switching means for normally disposing said switching means in said conductive state during charging periods of said voltage pulses when the voltage of the latter exceeds the terminal voltage of the battery and in said non-conductive state During intervals between said charging periods, level detecting circuit means connected to said control circuit means and including means for detecting the terminal voltage of the battery in said intervals between the charging periods of said voltage pulses and means for comparing the detected terminal voltage with a reference voltage and providing an output to said control circuit means for shifting said switching means to said non-conductive state thereof during said charging periods in response to said detected terminal voltage rising to a level having a predetermined relation to said reference voltage, and reference voltage control means including means for detecting the AC component of said charging current for the battery during said charging periods, and means establishing said reference voltage in correspondence with the detected AC component for varying said reference voltage from a relatively large value at the commencement of the charging of said battery to effect initial rapid charging with a high charging current, to a relatively lower value as charging of the battery proceeds to complete the charging with a relatively reduced charging current.
Claim 2
Dependent Claim
280 words
A battery charger comprising: power supply means including an AC power source and rectifier means for producing voltage pulses, switching means connected to said power supply means in series with a battery to be charged and having conductive and nonconductive states for supplying a charging current to the battery only when said switching means is in said conductive state, control circuit means connected to said switching means for normally disposing said switching means in said conductive state during charging periods of said voltage pulses when the voltage of the latter exceeds the terminal voltage of the battery and in said non-conductive state During intervals between said charging periods, level detecting circuit means connected to said control circuit means and including means for detecting the terminal voltage of the battery in said intervals between the charging periods of said voltage pulses and means for comparing the detected terminal voltage with a reference voltage and providing an output to said control circuit means for shifting said switching means to said non-conductive state thereof during said charging periods in response to said detected terminal voltage rising to a level having a predetermined relation to said reference voltage, and reference voltage control means including means for detecting the AC component of said charging current for the battery during said charging periods, and means establishing said reference voltage in correspondence with the detected AC component for varying said reference voltage from a relatively large value at the commencement of the charging of said battery to effect initial rapid charging with a high charging current, to a relatively lower value as charging of the battery proceeds to complete the charging with a relatively reduced charging current.
Claim 3
Dependent Claim
16 words
A battery charger according to claim 1, wherein said switching means includes a switching semiconductor element.
Claim 4
Dependent Claim
17 words
A battery charger according to claim 1, wherein said level detecting circuit means includes a Schmitt circuit.
Claim 5
Dependent Claim
205 words
A battery charger comprising: pulsating current power supply means including an AC power source and rectifier means, switching means connected to said power supply means in series with a battery to be charged, control circuit means connected to said switching means for controlling the charging current for the battery through said switching means, level detecting circuit means connected to said control circuit means for detecting a voltage of the battery by comparing the same with a reference voltage intermittently in synchronism with a period of said AC power source and providing a corresponding output controlling said switching means, and reference voltage control means including means for detecting the AC component of said charging current for the battery and means for varying said reference voltage in correspondence with the detected AC component so that said reference voltage, at the commencement of the charging of said battery, has a relatively large value to effect initial rapid charging with a high charging current and the reference voltage is reduced as charging of the battery proceeds to complete the charging with a relatively reduced charging current, and wherein said control circuit means includes a flip-flop circuit which is triggered in synchronism with a period of said AC power source.
Claim 6
Dependent Claim
205 words
A battery charger comprising: pulsating current power supply means including an AC power source and rectifier means, switching means connected to said power supply means in series with a battery to be charged, control circuit means connected to said switching means for controlling the charging current for the battery through said switching means, level detecting circuit means connected to said control circuit means for detecting a voltage of the battery by comparing the same with a reference voltage intermittently in synchronism with a period of said AC power source and providing a corresponding output controlling said switching means, and reference voltage control means including means for detecting the AC component of said charging current for the battery and means for varying said reference voltage in correspondence with the detected AC component so that said reference voltage, at the commencement of the charging of said battery, has a relatively large value to effect initial rapid charging with a high charging current and the reference voltage is reduced as charging of the battery proceeds to complete the charging with a relatively reduced charging current, and wherein said control circuit means includes a flip-flop circuit which is triggered in synchronism with a period of said AC power source.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |