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US4510564A
Expired / Lapsed
US
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Synchronously detected DC/DC converter for regulated power supply
Assignee: RCA Corp
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Filing: 1983-07-14
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Granted: 1985-04-09
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Expires: 2003-07-14
Abstract
Abstract A regulated power supply has a synchronous detector in a voltage regulator feedback loop. The detector is coupled to a secondary of a transformer to detect the AC voltage. The result is faster response time to a step change in the primary voltage and all DC output voltages are constant.
Inventors
- 👤 Harold G. Seer, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:05
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/10; H02M3/00; H02M3/22; H02M3/24; H02M3/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
A regulated power supply for operation from an unregulated DC power source, said supply comprising a reference voltage source; a comparator having a first input coupled to said reference source, a second input, and an output; a voltage regulator having a first input coupled to said comparator output, a second input adapted to be coupled to said power source, and an output; switching means having an input coupled to said voltage regulator output, and an output; a transformer having a primary winding coupled to said switching means output, and a first secondary winding; coupling means for coupling to said secondary; and a synchronous detector having a control input coupled to said secondary, a signal input coupled to said coupling means, and a signal output coupled to said comparator second input.
Claim 2
Dependent Claim
130 words
A regulated power supply for operation from an unregulated DC power source, said supply comprising a reference voltage source; a comparator having a first input coupled to said reference source, a second input, and an output; a voltage regulator having a first input coupled to said comparator output, a second input adapted to be coupled to said power source, and an output; switching means having an input coupled to said voltage regulator output, and an output; a transformer having a primary winding coupled to said switching means output, and a first secondary winding; coupling means for coupling to said secondary; and a synchronous detector having a control input coupled to said secondary, a signal input coupled to said coupling means, and a signal output coupled to said comparator second input.
Claim 3
Dependent Claim
28 words
A power supply as claimed in claim 1, further comprising a first rectifier and filter circuit coupled to said first secondary for producing a first DC output voltge.
Claim 4
Dependent Claim
53 words
A power supply as claimed in claim 1, wherein said transformer comprises a second secondary winding, and further comprising a second rectifier and filter circuit means coupled to said second secondary for producing a second DC output voltage; whereby regulating said first DC output voltage does not change said second DC output voltage.
Claim 5
Dependent Claim
27 words
A power supply as claimed in claim 1, wherein said coupling means comprises a second secondary winding having a common physical center point with said first secondary.
Claim 6
Dependent Claim
21 words
A power supply as claimed in claim 1, wherein said coupling means comprises a pair of taps on said first secondary.
Claim 7
Dependent Claim
62 words
A power supply as claimed in claim 1, wherein said synchronous detector comprises a pair of transistors, each having an emitter, collector, and base; said bases comprising said control input, said emitters and collectors respectively comprising said signal input and output; a pair of resistors respectively coupled between said secondary and said bases; and a capacitor coupled between said collector and ground.
References Cited (Backward Citations)
US3735235A
Cited
US4208706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |