US3886434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flyback transformer
Assignee: Thomas International Corp
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Filing: 1973-09-07
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Granted: 1975-05-27
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Expires: 1993-09-07
Abstract
Abstract A high voltage horizontal flyback transformer assembly includes a generally rectangular ferromagnetic core with a pair of opposing core legs. A primary or low voltage winding is split into two portions each mounted on a different core leg with the winding distributed so as to cover as much of the core as possible. A high voltage winding is split into two or more portions, each placed as close to the core as possible and each wound in such a fashion as to cover as much of the core as possible, to thus increase mutual coupling. In particular, one half of the total high voltage winding is concentrically mounted over each of the low voltage portions. One or more diodes are located in series between the high voltage portions to reduce the effect of the high secondary distributed capacitance on the primary circuit, equalize the ringing frequencies of each high voltage section, and provide high voltage rectification. The entire transformer assembly, including the diodes and a focus resistor, is mounted in an oil-filled container.
Inventors
- 👤 Louis W Schreiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:31
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/19; H01; H01F; H01F27/00; H01F27/28; H01F27/2823; H01F27/32; H01F27/321; H01F27/40; H01F38/00; H01F38/42; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/10; H01F27/408
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
A transformer assembly for generating deflection voltage waveforms in a television receiver, said waveforms being inherently subject to harmonic oscillations caused by distributed capacitance in said transformer, said transformer comprising: a U-shaped ferromagnetic core having an intermediate section and first and second generally parallel outer legs, a generally rectangular ferromagnetic core segment bridging said outer legs to complete a single window magnetic circuit; a primary winding having first and second segments; a split high voltage winding having first and second segments; a pair of low voltage bobbins carrying said primary segments surrounding and extending along and immediately adjacent to said first and second core legs respectively for substantially the entire length of said window and a pair of high voltage bobbins carrying said first and second high voltage segments respectively and surrounding said low voltage bobbins for substantially the entire length of said window; voltage rectifier means connected in series with said high voltage winding segments and intermediate the terminating ends of said high voltage winding.
Claim 2
Dependent Claim
166 words
A transformer assembly for generating deflection voltage waveforms in a television receiver, said waveforms being inherently subject to harmonic oscillations caused by distributed capacitance in said transformer, said transformer comprising: a U-shaped ferromagnetic core having an intermediate section and first and second generally parallel outer legs, a generally rectangular ferromagnetic core segment bridging said outer legs to complete a single window magnetic circuit; a primary winding having first and second segments; a split high voltage winding having first and second segments; a pair of low voltage bobbins carrying said primary segments surrounding and extending along and immediately adjacent to said first and second core legs respectively for substantially the entire length of said window and a pair of high voltage bobbins carrying said first and second high voltage segments respectively and surrounding said low voltage bobbins for substantially the entire length of said window; voltage rectifier means connected in series with said high voltage winding segments and intermediate the terminating ends of said high voltage winding.
Claim 3
Dependent Claim
21 words
The transformer assembly of claim 1 including a low voltage winding concentric with said core for providing a low voltage output.
Claim 4
Dependent Claim
50 words
The transformer assembly of claim 1 wherein said high voltage winding comprises a single layer solenoid wound concentric with said primary winding and having a first lead located substantially at one end of said primary winding and a terminating lead located substantially at the opposite end of said primary winding.
Claim 5
Dependent Claim
53 words
A transformer assembly of claim 1 wherein the high voltage winding is wound concentric with said primary winding and in random progressive or progressive universal configuration and has an input lead substantially adjacent one end of said primary winding and a terminating lead located substantially adjacent the opposite end of said primary winding.
Claim 6
Dependent Claim
43 words
The transformer assembly of claim 1 wherein the voltage rectifier means includes a first voltage rectifier connected intermediate of a pair of terminating ends of said high voltage winding to reduce the distributed capacitance produced by the first and second high voltage segments.
Claim 7
Dependent Claim
55 words
The transformer assembly of claim 1 wherein said voltage rectifier means includes a second voltage rectifier, said first voltage rectifier being located in series with said first high voltage segment and intermediate the ends thereof and said second voltage rectifier being located in series With said second high voltage segment and intermediate the ends thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |