US3633090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery-charging systems
Assignee: ZF International UK Ltd
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Filing: 1970-06-16
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Granted: 1972-01-04
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Expires: 1990-06-16
Abstract
Abstract In a battery-charging system in which a three-phase permanent magnet alternator charges a battery, the three output lines of the alternator are coupled by two variable impedance means connected between two of the three pairs of output lines. Voltage-sensing means connected across the battery controls the impedances of the variable impedance means to regulate the battery voltage.
Inventors
- 👤 William Frank Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:14
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/1469; H02J7/1492; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/92
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
A battery-charging system comprising in combination a threephase permanent magnet alternator having three output lines connected to a three-phase rectifier, the output from which charges the battery, first variable impedance means connected between one pair of phase points of the alternator, second variable impedance means connected between a second pair of output lines of the alternator, and voltage-sensing means connected across the battery for controlling the impedance of said variable impedance means to regulate the battery voltage.
Claim 2
Dependent Claim
77 words
A battery-charging system comprising in combination a threephase permanent magnet alternator having three output lines connected to a three-phase rectifier, the output from which charges the battery, first variable impedance means connected between one pair of phase points of the alternator, second variable impedance means connected between a second pair of output lines of the alternator, and voltage-sensing means connected across the battery for controlling the impedance of said variable impedance means to regulate the battery voltage.
Claim 3
Dependent Claim
13 words
A system as claimed in claim 1 in which the alternator is delta-connected.
Claim 4
Dependent Claim
14 words
A system as claimed in claim 1 in which the alternator is star connected.
Claim 5
Dependent Claim
42 words
A system as claimed in claim 3, modified in that one variable impedance means is connected between one pair of output lines, and the other variable impedance means is connected between the third output line and the center point of the alternator.
Claim 6
Dependent Claim
39 words
A system as claimed in claim 1 in which the alternator comprises a first single-phase winding and a second single-phase winding connected to a point on the first single-phase winding to constitute a Scott-T arrangement producing a three-phase output.
Claim 7
Dependent Claim
34 words
A system as claimed in claim 5, modified in that one of the variable impedance means is connected across the first winding, and the other variable impedance means is connected across the second winding.
Claim 8
Dependent Claim
94 words
A system as claimed in claim 1 in which each variable impedance means comprises a first saturable inductor and a first diode connected in series for passing current to one polarity, and a second saturable inductor and a second diode connected in series with one another across the series connection of first inductor and first diode for passing current to the other polarity, the voltage-sensing means including an output winding magnetically coupled to the inductors and serving to overcome the self-saturating effect of the inductors when the battery voltage is below a predetermined value.
Claim 9
Dependent Claim
26 words
A system as claimed in claim 7 in which the winding assists the self-saturating effect of the inductors when the voltage is above the predetermined value.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |