US3816807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance controlled battery charger and method of charging with monitoring of a.c. answer signal
Assignee: Gates Energy Products Inc
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Filing: 1973-07-18
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Granted: 1974-06-11
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Expires: 1993-07-18
Abstract
Abstract A battery charger comprises a variable current DC power supply adapted to be connected across a secondary battery, an AC modulator connected to the DC power supply, a phase sensitive detector adapted for connection across the battery, AC voltage reference signal means connected to the phase sensitive detector, and means for monitoring the amplitudes of two different voltage components of the AC voltage appearing across the battery. An impedance controlled battery charger is described in which the monitoring means of the above type of battery charger are provided in the form of a feedback control connected from the output of the phase sensitive detector to the DC power supply automatically adjusting DC current to match current accepting capabilities of the battery. Methods of battery charging are also described.
Inventors
- 👤 D Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:23
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/42; H01M10/44; H02; H02J; H02J7/00; H02J7/90; H02J7/96; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
69 words
A battery charger which comprises a variable current DC power supply adapted to be connected across a secondary battery, an AC modulator connected to the DC power supply, a phase sensitive detector adapted to be connected across the battery, AC voltage reference signal means connected to the phase sensitive detector, and means for monitoring the amplitudes of two different voltage components of the AC voltage appearing across the battery.
Claim 2
Dependent Claim
69 words
A battery charger which comprises a variable current DC power supply adapted to be connected across a secondary battery, an AC modulator connected to the DC power supply, a phase sensitive detector adapted to be connected across the battery, AC voltage reference signal means connected to the phase sensitive detector, and means for monitoring the amplitudes of two different voltage components of the AC voltage appearing across the battery.
Claim 3
Dependent Claim
43 words
A battery charger as in claim 1, in which the monitoring means monitor two DC voltage signals from the phase detector which signals are proportional to the amplitudes of the in-phase and out-of-phase voltage components of the AC voltage appearing across the battery.
Claim 4
Dependent Claim
29 words
A battery charger as in claim 1, in which the AC voltage reference signal means is connected from the output of the AC modulator to the phase sensitive detector.
Claim 5
Dependent Claim
39 words
A battery charger as in claim 1, in which the AC voltage reference signal means is connected across a resistance in series with the battery at the output of the DC power supply and to the phase sensitive detector.
Claim 6
Dependent Claim
16 words
A battery charger as in claim 1, in which the monitoring means is a display device.
Claim 7
Dependent Claim
44 words
An impedance controlled battery charger as in claim 1, in which the monitoring means is a feedback control connected from the output of the phase sensitive detector to the DC power supply automatically adjusting DC current to match current accepting capabilities of the battery.
Claim 8
Independent Claim
117 words
A method of charging a secondary battery which comprises applying a DC current across a battery to be charged, superimposing an AC current on the DC current, providing a voltage reference signal of known phase with respect to the AC current, measuring the amplitudes of two different AC voltage components from the battery output which voltage components differ by a constant and known phase angle, monitoring the AC voltage component amplitudes until changes occur indicating that current accepting capability of the battery has been exceeded, and adjusting the DC current input to the battery to maintain the difference in the AC voltage component amplitudes at that value corresponding to the limit of the battery''s current accepting capability.
Claim 9
Independent Claim
117 words
A method of charging a secondary battery which comprises applying a DC current across a battery to be charged, superimposing an AC current on the DC current, providing a voltage reference signal of known phase with respect to the AC current, measuring the amplitudes of two different AC voltage components from the battery output which voltage components differ by a constant and known phase angle, monitoring the AC voltage component amplitudes until changes occur indicating that current accepting capability of the battery has been exceeded, and adjusting the DC current input to the battery to maintain the difference in the AC voltage component amplitudes at that value corresponding to the limit of the battery''s current accepting capability.
Claim 10
Dependent Claim
91 words
A method of charging a secondary battery as in claim 7, in which the amplitudes are measured of two AC voltage components from the battery output which voltage components are 90* out-of-phase with each other, providing two DC voltage signals which are proportional to the amplitudes of the in-phase and out-of-phase voltage components measured across the terminals of the battery, and monitoring the two DC voltage signals until changes occur indicating that current accepting capability of the battery has been exceeded prior to adjusting the DC current input to the battery.
Claim 11
Dependent Claim
21 words
A method of charging as in claim 7, wherein the two AC voltage component amplitudes are monitored on a display device.
Claim 12
Dependent Claim
56 words
An impedance controlled method of charging as in claim 7, wherein the two AC voltage component amplitudes are monitored by a feedback control which adjusts automatically the DC current input to the battery to maintain the difference in the AC voltage component amplitudes at that value corresponding to the limit of the battery''s current accepting capability.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |