US3928787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energy stabilization in a horizontal deflection circuit for a television receiver
Assignee: Loewe Opta GmbH
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Filing: 1973-11-09
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Granted: 1975-12-23
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Expires: 1993-11-09
Abstract
Abstract A thyratron-like gating device governs the current supplied to an inductance in energy-exchanging relation with the storage capacitor in a reactive horizontal sweep circuit. The gating device is triggered by a control pulse that is delayed with respect to the start of the flyback portion of the sweep cycle by an amount proportional to the magnitude of the voltage stored on the capacitor at the start of flyback. The control pulse is generated upon the coincidence of a first saw-tooth voltage triggered at the start of flyback and a second voltage derived from the magnitude of the pulse generated in a secondary winding of the deflection transformer at the start of flyback. Suitable gain control facilities limit the magnitude of the second voltage to a value that assures generation of the control pulse within the flyback interval.
Inventors
- 👤 Erich Geiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:46
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/83; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185; H04N3/1856
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
246 words
In a deflection circuit having a repetitive sweep cycle including a first relatively short flyback interval and a second relatively long forward sweep interval wherein the circuit comprises, in combination, a first storage capacitor coupled between a supply inductor and the primary winding of a deflection transformer, first means for coupling the input of the inductor to a source of operating voltage whereby an oscillatory energy interchange occurs between the operating voltage source and the output of the deflection circuit via the inductance and the first storage capacitor, and a first thyratron-like gating means associated with the inductor, the switching time of the first gating means being varied in dependence on changes in the quantity of energy in such oscillatory energy interchange, the improvement wherein the first gating means is serially connected between the source of operating voltage and the input of the inductor, and wherein the circuit further comprises, in combination, first means for generating, during each first interval, an output control pulse of substantially fixed duration whose time of occurrence relative to the start of the associated first interval is proportional to the voltage stored on the first capacitor at the start of such first interval, and second means for coupling the output of the first generating means to the control electrode of the first gating means, whereby the time of occurrence of the output control pulse is automatically adjusted to maintain a constant dynamic current-voltage ratio at the output of the deflection transformer.
Claim 2
Dependent Claim
246 words
In a deflection circuit having a repetitive sweep cycle including a first relatively short flyback interval and a second relatively long forward sweep interval wherein the circuit comprises, in combination, a first storage capacitor coupled between a supply inductor and the primary winding of a deflection transformer, first means for coupling the input of the inductor to a source of operating voltage whereby an oscillatory energy interchange occurs between the operating voltage source and the output of the deflection circuit via the inductance and the first storage capacitor, and a first thyratron-like gating means associated with the inductor, the switching time of the first gating means being varied in dependence on changes in the quantity of energy in such oscillatory energy interchange, the improvement wherein the first gating means is serially connected between the source of operating voltage and the input of the inductor, and wherein the circuit further comprises, in combination, first means for generating, during each first interval, an output control pulse of substantially fixed duration whose time of occurrence relative to the start of the associated first interval is proportional to the voltage stored on the first capacitor at the start of such first interval, and second means for coupling the output of the first generating means to the control electrode of the first gating means, whereby the time of occurrence of the output control pulse is automatically adjusted to maintain a constant dynamic current-voltage ratio at the output of the deflection transformer.
Claim 3
Dependent Claim
138 words
A circuit as defined in claim 1, in which the first generating means comprises, in combination, comparator means having first and second inputs and an output adapted to exhibit a pulse upon a coincidence of voltage amplitudes applied to the first and second inputs, second means triggered at the start of the first interval for generating a first sawtooth voltage whose magnitude reaches a first value at the conclusion of the first interval, third means for generating a second voltage proportional to the magnitude of the voltage stored on the first capacitor at the start of the first interval, third means for coupling the output of the second generating means to the first input of the comparator means, and fourth means for coupling the output of the third generating means to the second input of the comparator means.
Claim 4
Dependent Claim
36 words
A circuit as defined in claim 2, in which the third generating means further comprises, in combination, a first secondary winding of the deflection transformer, and means for rectifying the output of the first secondary winding.
Claim 5
Dependent Claim
31 words
A circuit as defined in claim 2, in which the third generating means further comprises gain control means for limiting the maximum value of the second voltage to the first value.
Claim 6
Dependent Claim
149 words
A circuit as defined in claim 3, in which the third generating means comprises, in combination, second and third gating means, second and third capacitors, means for coupling the output of the rectifying means across the second and third capacitors, respectively, means for producing a third voltage proportional to the difference between the voltage across the second capacitor and a reference value, fifth means for coupling the third voltage to the control electrode of the second gating means so that such second gating means conducts when the third voltage is within a prescribed range, sixth means for coupling the voltage across the third capacitor to the control electrode of the third gating means, and seventh means for coupling the output of the second gating means to the control electrode of the third gating means, the third gating means being made conductive upon the conduction of the second gating means.
Claim 7
Dependent Claim
101 words
A circuit as defined in claim 5, in which the deflection transformer includes a second secondary winding, and in which the circuit further comprises, in combination, a common terminal for exciting the second and third generating means, a diode for coupling the second secondary winding to one terminal of the diode, eighth means for coupling the other terminal of the diode to the common terminal, and ninth means for coupling the third capacitor to the common terminal, the diode being rendered non-conductive to decouple the second secondary winding from the common terminal in the presence of voltage across the third capacitor.
References Cited (Backward Citations)
US3689797A
Cited
US3767960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |