US4855663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging control apparatus
Assignee: Yuasa Corp
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Filing: 1988-02-23
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Granted: 1989-08-08
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Expires: 2008-02-23
Abstract
Abstract A charging control apparatus comprising a switching circuit for controlling a charging current from a charging power source to a storage battery. A reference voltage is provided which increases with a ramp corresponding to a value equal to, or more than, the maximum ramp value of the charging characteristic of the battery and a reference voltage is also provided which increases with time with a ramp corresponding to a value equal to, or less than, the minimum ramp value of the charging characteristic. The terminal voltage of the battery is sensed by a voltage sensor. A first comparator compares the reference voltage and a first sensed voltage from the voltage sensor. The ramp of the reference voltage is switched in accordance with the output of the first comparator. A second comparator compares the reference voltage and a second sensed voltage from the voltage sensor. The switching circuit is controlled by the output of the second comparator.
Inventors
- 👤 Tomoki Matsui
- 👤 Hidesuke Kimoto
- 👤 Setsuo Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:04
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/96; H02J7/963
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
193 words
A battery charging control apparatus comprising: a charging power supply source; a switching circuit for controlling the charging current from said charging power source to a storage battery; ramp generating means for providing a first ramp reference voltage increasing with time corresponding to a value equal to, or more than, the maximum ramp value of the charging characteristic of the storage battery and a second ramp reference voltage increasing with time and corresponding to a value equal to, or less than, the minimum ramp value of the charging characteristic of the storage battery; a voltage sensor for sensing respective first and second voltages relating to the terminal voltage of said storage battery; first comparing means for providing a first output when said first voltage coincides with said first ramp reference voltage and a second output when said first voltage coincides with said second ramp reference voltage; said ramp generating means providing said first ramp reference voltage with said second output and said first ramp reference voltage with said first output; and second comparing means for controlling said switching circuit to terminate charging when said second voltage coincides with said second ramp reference voltage.
Claim 2
Dependent Claim
193 words
A battery charging control apparatus comprising: a charging power supply source; a switching circuit for controlling the charging current from said charging power source to a storage battery; ramp generating means for providing a first ramp reference voltage increasing with time corresponding to a value equal to, or more than, the maximum ramp value of the charging characteristic of the storage battery and a second ramp reference voltage increasing with time and corresponding to a value equal to, or less than, the minimum ramp value of the charging characteristic of the storage battery; a voltage sensor for sensing respective first and second voltages relating to the terminal voltage of said storage battery; first comparing means for providing a first output when said first voltage coincides with said first ramp reference voltage and a second output when said first voltage coincides with said second ramp reference voltage; said ramp generating means providing said first ramp reference voltage with said second output and said first ramp reference voltage with said first output; and second comparing means for controlling said switching circuit to terminate charging when said second voltage coincides with said second ramp reference voltage.
Claim 3
Dependent Claim
53 words
A battery charging control apparatus according to claim 1, wherein the charging power supply source includes a rectifier for rectifying a commercially available power source and a ringing choke type converter and wherein the switching circuit includes a chopper circuit for receiving the output of the converter to control charging of the battery.
Claim 4
Dependent Claim
28 words
A charging control apparatus according to claim 1, wherein the first sensed voltage from the voltage sensor is lower by a predetermined value than the second sensed voltage.
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) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |