US4618919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Topology for miniature power supply with low voltage and low ripple requirements
Assignee: Unisys Corp
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Filing: 1984-10-04
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Granted: 1986-10-21
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Expires: 2004-10-04
Abstract
Abstract A power supply topology which minimizes inductance and capacitance requirements for filtering the ripple of single or multiple output switching mode power supplies. A capacitor at the input of the power supply provides continuous support for the output signal produced by the power supply.
Inventors
- 👤 Hubert C. Martin, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:05
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33569
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
A transformer circuit comprising, first electrical transformer means having a primary winding and a secondary winding, second electrical transformer means having a primary winding and a secondary winding, source means, capacitor means, switch means for selectively connecting at least one of said primary windings to said capacitor means to receive an electrical signal therefrom and selectively connecting each of said primary windings to said source means when said primary winding is not connected to said capacitor means, and output means connected to both of said secondary windings of said first and second electrical transformer means.
Claim 2
Dependent Claim
95 words
A transformer circuit comprising, first electrical transformer means having a primary winding and a secondary winding, second electrical transformer means having a primary winding and a secondary winding, source means, capacitor means, switch means for selectively connecting at least one of said primary windings to said capacitor means to receive an electrical signal therefrom and selectively connecting each of said primary windings to said source means when said primary winding is not connected to said capacitor means, and output means connected to both of said secondary windings of said first and second electrical transformer means.
Claim 3
Dependent Claim
22 words
The circuit recited in claim 1 wherein, said output means includes unilaterally conducting means to control the direction of the output signal.
Claim 4
Dependent Claim
58 words
The circuit recited in claim 1 wherein, said switch means comprises, a first switch which selectively connects said primary winding of said first transformer means to said capacitor means or to said source means, and a second switch which selectively connects said primary winding of said second transformer means to said capacitor means or to said source means.
Claim 5
Dependent Claim
24 words
The circuit recited in claim 1 wherein, said secondary windings of said first and second transformer means are connected to a common load means.
Claim 6
Dependent Claim
13 words
The circuit recited in claim 1 wherein, said switch means comprises semiconductor devices.
Claim 7
Dependent Claim
14 words
The circuit recited in claim 1 wherein, said capacitor means comprises a ceramic capacitor.
Claim 8
Dependent Claim
13 words
The circuit recited in claim 2 wherein, said unilaterally conducting means comprises diodes.
Claim 9
Dependent Claim
31 words
The circuit recited in claim 3 wherein, said first switch and said second switch selectively connect said capacitor means to said first transformer means and to said second transformer means concurrently.
Claim 10
Dependent Claim
41 words
The circuit recited in claim 1 wherein, said switch means comprises a pair of field effect transistors connected in parallel, and drive circuit means connected to said pair of field effect transistors to cause said field effect transistors to operate alternatively.
Claim 11
Dependent Claim
18 words
The circuit recited in claim 9 wherein, said pair of field effect transistors are of opposite conductivity types.
Claim 12
Dependent Claim
58 words
The circuit recited in claim 1 wherein, said capacitor means is continually charging and discharging through said switch means and the respective primary windings of said first and second electrical transformer means in order to provide energy to said output means through the inductive coupling to the respective secondary windings of said first and second electrical transformer means.
Claim 13
Dependent Claim
22 words
The circuit recited in claim 1 wherein, said source means provides a DC voltage and said circuit operates as a DC/DC converter.
Claim 14
Dependent Claim
14 words
The circuit recited in claim 1 wherein, said switch means comprises relays type switches.
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) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |