Patent US3665288A successfully refreshed from Google Patents.
US3665288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television sweep transformer
Assignee: Zenith Electronics LLC
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Filing: 1970-09-02
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Granted: 1972-05-23
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Expires: 1990-09-02
Abstract
Abstract A harmonically tuned horizontal output transformer has the turns of the tertiary winding apportioned between two series connected winding sections in order to reduce its distributed capacitance and leakage inductance. These sections enclose the primary to establish a predetermined coupling therewith such that the leakage inductance of the tertiary resonates its distributed capacitance at the fifth harmonic of the characterizing frequency of the retrace pulse. The retrace pulse and the harmonic algebraically combine to provide a broadly peaked drive pulse for the high voltage rectifier.
Inventors
- 👤 Theodore J Godawski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:26
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/42
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
293 words
In a television receiver having a deflection system which includes an associated high voltage generating circuit comprising a rectifier and which also includes an energizing circuit, a transformer for use in said deflection system comprising: a closed core of magnetic material; a primary winding enclosing a portion of said core for developing, in response to energization of said deflection system, a deflection signal which includes a peaked retrace pulse having a predetermined characterizing frequency; a tertiary winding physically enclosing said primary winding and comprising a multiplicity of turns apportioned between a plurality of spaced apart series connected winding sections for effecting a minimal distributed capacitance between the turns of said tertiary winding and for reducing the leakage inductance of said tertiary winding; and said tertiary winding serving to develop, in response to energization by said primary winding, a stepped-up replica of said peaked retrace pulse; means for coupling an output terminal of said tertiary winding to said rectifier of said high voltage generating circuit; and spacer means interposed between said tertiary sections and between said tertiary sections and said primary winding for establishing a predetermined coupling between said primary and said tertiary winding to tune the leakage inductance of said tertiary winding to resonate the effective capacitance across said tertiary winding to develop across said tertiary leakage inductance an alternating signal having a frequency which is the fifth harmonic of the characterizing frequency of said retrace pulse for algebraic combination with said peaked retrace pulse replica to derive a high voltage pulse having a broadened peak, relative to said pulse replica, at said tertiary output terminal for application to said high voltage generating circuit to increase the conduction period of said rectifier and thereby improve the regulation of said high voltage generating circuit.
Claim 2
Dependent Claim
293 words
In a television receiver having a deflection system which includes an associated high voltage generating circuit comprising a rectifier and which also includes an energizing circuit, a transformer for use in said deflection system comprising: a closed core of magnetic material; a primary winding enclosing a portion of said core for developing, in response to energization of said deflection system, a deflection signal which includes a peaked retrace pulse having a predetermined characterizing frequency; a tertiary winding physically enclosing said primary winding and comprising a multiplicity of turns apportioned between a plurality of spaced apart series connected winding sections for effecting a minimal distributed capacitance between the turns of said tertiary winding and for reducing the leakage inductance of said tertiary winding; and said tertiary winding serving to develop, in response to energization by said primary winding, a stepped-up replica of said peaked retrace pulse; means for coupling an output terminal of said tertiary winding to said rectifier of said high voltage generating circuit; and spacer means interposed between said tertiary sections and between said tertiary sections and said primary winding for establishing a predetermined coupling between said primary and said tertiary winding to tune the leakage inductance of said tertiary winding to resonate the effective capacitance across said tertiary winding to develop across said tertiary leakage inductance an alternating signal having a frequency which is the fifth harmonic of the characterizing frequency of said retrace pulse for algebraic combination with said peaked retrace pulse replica to derive a high voltage pulse having a broadened peak, relative to said pulse replica, at said tertiary output terminal for application to said high voltage generating circuit to increase the conduction period of said rectifier and thereby improve the regulation of said high voltage generating circuit.
Claim 3
Dependent Claim
44 words
A transformer as set forth in claim 1 in which said tertiary winding comprises two sections and in which the width of the turn layers of said primary is at least co-extensive with the combined widths of the turn layers of said tertiary sections.
Claim 4
Dependent Claim
34 words
A transformer as set forth in claim 2 in which said tertiary winding comprises n turns and said first section comprises approximately 0.54 n turns and said second section comprises approximately 0.46 n turns.
Claim 5
Dependent Claim
35 words
A transformer as set forth in claim 2 in which the spacing between said primary winding and said second tertiary section is greater than the spacing between said primary winding and said first tertiary section.
Claim 6
Dependent Claim
50 words
A transformer as set forth in claim 2 in which the finish turn of said primary winding is electrically connected to the start turn of said first tertiary section and said finish turn of said first tertiary section is conductively connected to the start turn of said second tertiary section.
Claim 7
Dependent Claim
20 words
A transformer as set forth in claim 1 in which said tertiary winding comprises three spaced-apart series connected winding sections.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |