Patent US3654537A successfully refreshed from Google Patents.
US3654537A
Expired / Lapsed
US
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High efficiency power supply for charging capacitors in steps
Assignee: Westinghouse Electric Corp
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Filing: 1970-04-29
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Granted: 1972-04-04
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Expires: 1990-04-29
Abstract
Abstract A system for direct current resonant charging of capacitors in which the size and weight of the power supply and an inductive choke for limiting surge currents can be materially reduced by charging the capacitor in successive steps, each of a higher voltage level than the preceding step. This reduces the current surge from the supply during each step and also reduces the size of the required choke.
Inventors
- 👤 David W Coffey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:53
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/02; A61N1/025; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/372; A61N1/378; B; B23; B23K; B23K11/00; B23K11/24; B23K11/26; H; H01; H01S; H01S3/00; H01S3/09; H01S3/091; H01S3/0915; H01S3/092; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/06; H02M3/07; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/10; H03; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/57; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/282; H05B41/2821; H02M3/01; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
In a system for charging a capacitor by direct current resonant charging techniques, the combination of a pair of input terminals adapted for connection to a source of direct current power, a transfer device having a direct current chopper circuit connected to said terminals and inductively coupled through primary winding means to a plurality of secondary windings, each secondary winding having a different turns ratio with respect to said primary winding means whereby the voltages appearing across said secondary windings will differ one from the other, full wave rectifier means connected to the output of said secondary windings, transistor switch means for connecting said secondary windings across said capacitor in sequence whereby the voltage across the capacitor will rise in steps, an inductive choke interposed between said input terminals and said capacitor, and a synchronizing circuit connected to the bases of said transistors for causing them to fire in sequence.
Claim 2
Dependent Claim
150 words
In a system for charging a capacitor by direct current resonant charging techniques, the combination of a pair of input terminals adapted for connection to a source of direct current power, a transfer device having a direct current chopper circuit connected to said terminals and inductively coupled through primary winding means to a plurality of secondary windings, each secondary winding having a different turns ratio with respect to said primary winding means whereby the voltages appearing across said secondary windings will differ one from the other, full wave rectifier means connected to the output of said secondary windings, transistor switch means for connecting said secondary windings across said capacitor in sequence whereby the voltage across the capacitor will rise in steps, an inductive choke interposed between said input terminals and said capacitor, and a synchronizing circuit connected to the bases of said transistors for causing them to fire in sequence.
Claim 3
Dependent Claim
30 words
The system of claim 1 wherein said transistors are fired in sequence to connect the secondary windings to said capacitor such that the voltage across said capacitor increases in steps.
Claim 4
Dependent Claim
15 words
The system of claim 1 including rectifiers interposed between said secondary windings and said transistors.
Claim 5
Dependent Claim
15 words
The system of claim 3 including diodes connected across the output terminals of said rectifiers.
Claim 6
Dependent Claim
19 words
The system of claim 4 wherein the output voltages across said rectifiers are applied in series across said capacitor.
References Cited (Backward Citations)
US2507022A
Cited
US3529228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |