US4639663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fly-back transformer with reduced ringing
Assignee: Murata Manufacturing Co Ltd
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Filing: 1986-01-21
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Granted: 1987-01-27
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Expires: 2006-01-21
Abstract
Abstract A fly-back transformer to be used for use in the supply of a DC high voltage into a cathode-ray tube such as TV image receiving machine or the like. The ringing removing wire connected with the secondary winding through the distributed capacity with respect to the secondary winding to form a closed circuit of ringing current together with the secondary winding is connected in parallel to the primary winding through the DC resistance component, so that the ringing may be damped by the closed circuit.
Inventors
- 👤 Michio Ueno
- 👤 Toshimi Miyagi
- 👤 Soji Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:14
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/42; H01F5/00; H01F5/02; H01F2005/022
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
A fly-back transformer wherein a primary winding and a secondary winding are provided, a ringing removing winding which is connected with the secondary winding through the distributed capacity with respect to the secondary winding to form a closed circuit of the ringing current together with said secondary winding is connected in parallel to said primary winding through a DC resistance component, said primary winding and said ringing removing winding satisfy a relation formula of 0.85≦M/L1≦1, wherein L1 is the inductance of the primary winding, M is the mutual inductance between the primary winding and the ringing removing winding, the impedance between said primary winding and the secondary winding has a value larger with respect to the frequency of the ringing current than a value of the DC resistance component added to the impedance between the ringing removing winding and the secondary winding.
Claim 2
Dependent Claim
142 words
A fly-back transformer wherein a primary winding and a secondary winding are provided, a ringing removing winding which is connected with the secondary winding through the distributed capacity with respect to the secondary winding to form a closed circuit of the ringing current together with said secondary winding is connected in parallel to said primary winding through a DC resistance component, said primary winding and said ringing removing winding satisfy a relation formula of 0.85≦M/L1≦1, wherein L1 is the inductance of the primary winding, M is the mutual inductance between the primary winding and the ringing removing winding, the impedance between said primary winding and the secondary winding has a value larger with respect to the frequency of the ringing current than a value of the DC resistance component added to the impedance between the ringing removing winding and the secondary winding.
Claim 3
Dependent Claim
21 words
A fly-back transformer as claimed in claim 1, wherein said closed circuit includes a resistance element as the DC resistance component.
Claim 4
Dependent Claim
36 words
A fly-back transformer as claimed in claim 1, wherein said ringing removing winding is at least partially constituted by a resistance wire and the resistance value of said resistance wire acts as said DC resistance component.
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) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |