Patent US3662307A successfully refreshed from Google Patents.
US3662307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flyback transformer
Assignee: Panasonic Holdings Corp
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Filing: 1969-12-10
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Granted: 1972-05-09
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Expires: 1989-12-10
Abstract
Abstract Temperature increase becomes a problem with a flyback transformer of a television receiver since it handles a high voltage. In order to cope with this, it has conventionally been the usual practice to make the core gap sufficiently great to provide allowance for the design. With such a construction, however, the transformer becomes large in size, and the highvoltage stability thereof is deteriorated. In view of this, in accordance with the present invention, a temperature-sensitive ferrite is provided in the gap of the core to prevent the slope of the B-H curve from becoming unduly small and to stabilize the high voltage during normal operation. In case the temperature is increased, the Curie point of this temperature-sensitive ferrite is utilized to improve the temperature stability of the flyback transformer.
Inventors
- 👤 Teruhiro Tsukuda
- 👤 Takashi Tsutsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:32
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/42; G; G05; G05F; G05F3/00; G05F3/02; G05F3/04; G05F3/06; H01F27/00; H01F27/008; H01F2038/426
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A flyback transformer having a ferrite core formed with an air gap and primary and secondary coils wound on said ferrite core for producing a high voltage in a television receiver, wherein the improvement comprises a temperature-sensitive ferrite inserted in said air gap which becomes rapidly paramagnetic when the temperature of said ferrite is increased beyond a predetermined value, said flyback transformer having a relatively low magnetic reluctance at temperatures below said predetermined value and remaining unsaturated at temperatures above said value thereby preventing excessive temperature rise.
Claim 2
Dependent Claim
87 words
A flyback transformer having a ferrite core formed with an air gap and primary and secondary coils wound on said ferrite core for producing a high voltage in a television receiver, wherein the improvement comprises a temperature-sensitive ferrite inserted in said air gap which becomes rapidly paramagnetic when the temperature of said ferrite is increased beyond a predetermined value, said flyback transformer having a relatively low magnetic reluctance at temperatures below said predetermined value and remaining unsaturated at temperatures above said value thereby preventing excessive temperature rise.
Claim 3
Dependent Claim
102 words
A flyback transformer having a ferrite core formed with an air gap and primary and secondary coils wound on said ferrite core for producing a high voltage in a television receiver, wherein the improvement comprises a temperature-sensitive ferrite disposed in engagement with a recess formed in said air gap with a configuration similar to said temperature-sensitive ferrite, said ferrite becoming rapidly paramagnetic when the temperature of said ferrite is increased beyond a predetermined value, said flybaCk transformer having a relatively low magnetic reluctance at temperatures below said predetermined value and remaining unsaturated at temperatures above said value thereby preventing excessive temperature rise.
Claim 4
Dependent Claim
102 words
A flyback transformer having a ferrite core formed with an air gap and primary and secondary coils wound on said ferrite core for producing a high voltage in a television receiver, wherein the improvement comprises a temperature-sensitive ferrite disposed in engagement with a recess formed in said air gap with a configuration similar to said temperature-sensitive ferrite, said ferrite becoming rapidly paramagnetic when the temperature of said ferrite is increased beyond a predetermined value, said flybaCk transformer having a relatively low magnetic reluctance at temperatures below said predetermined value and remaining unsaturated at temperatures above said value thereby preventing excessive temperature rise.
Claim 5
Dependent Claim
22 words
A flyback transformer as defined by claim 1 wherein said temperature sensitive ferrite becomes rapidly paramagnetic when a predetermined temperature is reached.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |