Patent US4667279A successfully refreshed from Google Patents.
US4667279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer coupled pard bucker for DC power supplies
Assignee: HP Inc
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Filing: 1986-04-01
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Granted: 1987-05-19
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Expires: 2006-04-01
Abstract
Abstract A noise reduction circuit for a DC power supply in which the input of a high pass filter is coupled to the output circuit of the supply so as to receive a noise signal, the output of the high pass filter is coupled to the primary winding of a transformer via an amplifier, and the secondary winding of the transformer is coupled to the output circuit of the supply so as to reduce the noise therein.
Inventors
- 👤 Craig P. Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:48
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/14; H02M1/15
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
78 words
A DC power supply in which noise appears in an output thereof, comprising means including a high pass filter coupled to said output for deriving a signal corresponding to the noise at said output, a transformer having primary and secondary windings, means including an amplifier for coupling said primary winding to said means for deriving a signal corresponding to the noise, and means for coupling said secondary winding to said output so as to reduce the noise therein.
Claim 2
Dependent Claim
78 words
A DC power supply in which noise appears in an output thereof, comprising means including a high pass filter coupled to said output for deriving a signal corresponding to the noise at said output, a transformer having primary and secondary windings, means including an amplifier for coupling said primary winding to said means for deriving a signal corresponding to the noise, and means for coupling said secondary winding to said output so as to reduce the noise therein.
Claim 3
Dependent Claim
64 words
A DC power supply as set forth in claim 1 having means for producing a regulated direct current voltage across said output, said high pass filter having an input coupled across said output circuit and an output coupled to said amplifier, and wherein said last means connects said secondary winding to said output to vary the voltage appearing thereacross in accordance with the noise.
Claim 4
Dependent Claim
65 words
A DC power supply as set forth in claim 1 having means for providing a regulated direct current at said output when a load is connected thereacross, a resistor connected to said output so as to be traversed by any regulated load current, said high pass filter having an input coupled across said resistor, and said last means connecting said secondary winding across said output.
References Cited (Backward Citations)
US4594648A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |