US3796827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low voltage supply circuit for solid-state t.v. receiver, with feedback inhibitor
Assignee: Blaupunkt Werke GmbH
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Filing: 1972-12-07
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Granted: 1974-03-12
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Expires: 1992-12-07
Abstract
Abstract To prevent feedback of inductive peaks in low-voltage supply circuits of solid-state television receivers, in which a lowvoltage supply circuit is energized during the retrace interval from the line deflection circuit, and in which the line deflection circuit includes controlled rectifiers, which controlled rectifiers might be triggered spuriously by such feedback peaks, an inhibiting circuit is connected to the rectifier circuit of the low-voltage supply, which is fed from an inductance, to suppress feedback through the inductance upon sudden drawing of current by the supply circuit; this inhibit circuit may be an inductance connected in series with the rectifier of the low-voltage supply, or an additional source of direct current which pre-charges the smoothing capacitor of the rectifier circuit; such low voltage d-c can be obtained, for example, from the filament transformer for the cathode ray tube, with a half-wave rectifier, the voltage being delivered to the low-voltage supply being less than that normally required by the low-voltage supply so that, when the low-voltage supply draws current, the half-wave rectifier will block and prevent power from being fed from the supply into the power transformer.
Inventors
- 👤 W Riechmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:35
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
216 words
In a stabilized low-voltage supply circuit for solid-state television receivers having a horizontal deflection circuit which comprises controllable rectifier elements (15, 16), an inductance, and storage capacitor means (13, 14) having charge energy applied thereto by said controllable rectifier elements during line trace interval for storage in said capacitor means; a low-voltage supply circuit including an additional winding (26) inductively coupled to the inductance (11) and a rectifier circuit (27, 28) connected to the additional winding to be responsive to peak values of voltage and providing, at its output, said stabilized supply voltage; the inductivity of the inductance (11) being dimensioned to have a voltage peak appear thereat during the charging interval which is independent of changes in loading on the horizontal deflection circuit, and said inductance having a tap (11'') which is connected to control at least one (16) of the controlled rectifier elements (15, 16), the improvement comprising inhibitor circuit means (50; 60, 61) connected into the additional winding-rectifier circuit (26-27, 28) of the lowvoltage supply circuit and suppressing feedback effects between the inductance (11) and the additional winding (26) upon start of energy transfer to the charging capacitors, and inhibiting spurious peaks at said inductance (11) and its tap (11'') and thus inhibit spurious triggering of said at least one controlled recitifier element.
Claim 2
Dependent Claim
216 words
In a stabilized low-voltage supply circuit for solid-state television receivers having a horizontal deflection circuit which comprises controllable rectifier elements (15, 16), an inductance, and storage capacitor means (13, 14) having charge energy applied thereto by said controllable rectifier elements during line trace interval for storage in said capacitor means; a low-voltage supply circuit including an additional winding (26) inductively coupled to the inductance (11) and a rectifier circuit (27, 28) connected to the additional winding to be responsive to peak values of voltage and providing, at its output, said stabilized supply voltage; the inductivity of the inductance (11) being dimensioned to have a voltage peak appear thereat during the charging interval which is independent of changes in loading on the horizontal deflection circuit, and said inductance having a tap (11'') which is connected to control at least one (16) of the controlled rectifier elements (15, 16), the improvement comprising inhibitor circuit means (50; 60, 61) connected into the additional winding-rectifier circuit (26-27, 28) of the lowvoltage supply circuit and suppressing feedback effects between the inductance (11) and the additional winding (26) upon start of energy transfer to the charging capacitors, and inhibiting spurious peaks at said inductance (11) and its tap (11'') and thus inhibit spurious triggering of said at least one controlled recitifier element.
Claim 3
Dependent Claim
30 words
Circuit according to claim 1, wherein said inhibitor circuit means comprises an inductance (50) connected in the rectifier circuit (27, 28), in series with and behind the rectifier (27) thereof.
Claim 4
Dependent Claim
24 words
Circuit according to claim 1, wherein said inhibitor circuit means comprises means (60, 61) introducing a direct current voltage into the low-voltage supply circuit.
Claim 5
Dependent Claim
58 words
Circuit according to claim 3, comprising a transformer (60) and a diode, the output voltage of the transformer being applied over the diode and being dimensioned such that the diode blocks upon transfer of energy from said inductance (11) over said additional winding (26) to the low-voltage supply circuit, to isolate the transformer from the low-voltage supply circuit.
Claim 6
Dependent Claim
30 words
Circuit according to claim 4, wherein said low-voltage supply circuit comprises a smoothing capacitor, the voltage supplied by the transformer (60) and the diode (61) pre-charging said smoothing capacitor (28).
Claim 7
Dependent Claim
49 words
Circuit according to claim 1, wherein the low-voltage supply circuit comprises a rectifier (27) and a smoothing capacitor (28), and wherein said inhibitor circuit means comprises means (60, 61) pre-charging the smoothing capacitor (28) in advance of charging of said capacitor means (13, 14) of the horizontal deflection circuit.
Claim 8
Dependent Claim
63 words
Circuit according to claim 6, wherein the means to pre-charge the smoothing capacitor (28) comprises a source of alternating current (60) and a rectifier means (61) providing a voltage less than the voltage of the low-voltage supply circuit, the rectifier means blocking and isolating the source of a-c from the low-voltage supply circuit when the low-voltage supply circuit provides its nominal ouTput voltage.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |