US3919599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Horizontal deflection circuit for television receivers
Assignee: Nokia Deutschland GmbH
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Filing: 1973-09-27
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Granted: 1975-11-11
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Expires: 1993-09-27
Abstract
Abstract A horizontal deflection circuit for a television receiver including a deflection unit having a sweep control, commutation switch and a controlled switch for controlling the energy stored in the horizontal final stage. Said energy controlling means including a thyristor for controlling switch energy returned to the power line so that the energy stored in a commutating capacitor is essentially constant for each sweep and the deflection current is independent of line voltage.
Inventors
- 👤 Klaus Reh
- 👤 Peter Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:34
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185; H04N3/1856
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
160 words
A horizontal deflection circuit for television receivers, comprising: means for controlling a horizontal sweep; means for controlling commutation; a deflection unit controlled by the previously mentioned means; a dc voltage source; a storage inductance connected in series with the dc voltage source and the deflection unit, said commutation control means formed and arranged to connect the storage inductance across the dc voltage source during periods of commutation; means connected in series with the storage inductance for permitting current to flow in a first direction from the source to the inductance while blocking reverse current flow; and an electronic switch means connected in parallel with the last mentioned means for blocking current flow in the first direction to the inductance from the source and for allowing a current flow in the opposite direction during a period controlled in accordance with a controlled variable developed across the deflection unit during commutation and corresponding to the energy requirements of the horizontal deflection circuit.
Claim 2
Dependent Claim
160 words
A horizontal deflection circuit for television receivers, comprising: means for controlling a horizontal sweep; means for controlling commutation; a deflection unit controlled by the previously mentioned means; a dc voltage source; a storage inductance connected in series with the dc voltage source and the deflection unit, said commutation control means formed and arranged to connect the storage inductance across the dc voltage source during periods of commutation; means connected in series with the storage inductance for permitting current to flow in a first direction from the source to the inductance while blocking reverse current flow; and an electronic switch means connected in parallel with the last mentioned means for blocking current flow in the first direction to the inductance from the source and for allowing a current flow in the opposite direction during a period controlled in accordance with a controlled variable developed across the deflection unit during commutation and corresponding to the energy requirements of the horizontal deflection circuit.
Claim 3
Dependent Claim
40 words
A horizontal deflection circuit as described in claim 1, wherein the electronic switch means comprises: a semiconductor switch; and a control circuit for controlling the semiconductor switch in accordance with the controlled variable developed across the deflection unit during commutation.
Claim 4
Dependent Claim
30 words
A horizontal deflection circuit as described in claim 2 wherein the semiconductor switch comprises a thyristor having a gate connected to the control circuit for receiving a pulse signal therefrom.
Claim 5
Dependent Claim
31 words
A horizontal deflection circuit as described in claim 2 wherein the semiconductor switch is turned on prior to commutation and is caused to turn off by the current reversal during commutation.
Claim 6
Dependent Claim
18 words
A horizontal deflection circuit aS described in claim 2 wherein the control variable is a horizontal kick-back pulse.
Claim 7
Dependent Claim
30 words
A horizontal deflection circuit as described in claim 2 wherein the control circuit is a pulse width modulator for providing a pulse having a width corresponding to the controlled variable.
References Cited (Backward Citations)
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US3179843A
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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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |