US3646392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television high-voltage regulator circuit
Assignee: Philips North America LLC
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Filing: 1969-08-28
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Granted: 1972-02-29
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Expires: 1989-08-28
Abstract
Abstract A circuit is disclosed for maintaining a constant accelerating anode voltage over a wide range of beam currents in a cathode-ray tube by regulating the peak value of the horizontal retrace signal used to generate the accelerating voltage. A diodecapacitor clamp circuit coupled to the horizontal output stage is loaded by a variable resistance discharge path responsive through a sensing circuit to variations in beam current in the described embodiment.
Inventors
- 👤 Joseph G Zahnen
- 👤 George A Kent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:26
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
108 words
A voltage regulator circuit for use with a voltage-generating circuit and a source of electrical pulses, said voltagegenerating circuit producing a unidirectional voltage at an output in response to a series of pulses applied to it from said pulse source, and comprising sensing means coupled to said voltage-generating circuit for producing a signal related to the output current of said generating circuit, a clamp circuit coupled to said pulse source and clamping the pulses applied to said voltage-generating circuit at a predetermined level, and variable impedance load circuit means coupled to said clamp circuit and said sensing means for varying said predetermined level in response to said signal.
Claim 2
Dependent Claim
108 words
A voltage regulator circuit for use with a voltage-generating circuit and a source of electrical pulses, said voltagegenerating circuit producing a unidirectional voltage at an output in response to a series of pulses applied to it from said pulse source, and comprising sensing means coupled to said voltage-generating circuit for producing a signal related to the output current of said generating circuit, a clamp circuit coupled to said pulse source and clamping the pulses applied to said voltage-generating circuit at a predetermined level, and variable impedance load circuit means coupled to said clamp circuit and said sensing means for varying said predetermined level in response to said signal.
Claim 3
Dependent Claim
34 words
The voltage regulator circuit of claim 1 wherein said clamp circuit comprises a unidirectionally conductive element and a capacitive element coupled in series arrangement between said pulse source and a point of reference potential.
Claim 4
Dependent Claim
28 words
The voltage regulator circuit of claim 2 wherein said variable impedance load circuit means comprises a variable resistance path coupled in parallel arrangement with said capacitive circuit element.
Claim 5
Dependent Claim
103 words
A television high-voltage regulator circuit for use with a high-voltage-generating circuit producing a unidirectional high-voltage at an output in response to a series of electrical pulses applied to it from a pulse source, said voltage regulator circuit comprising sensing circuit means coupled to said voltage-generating circuit for producing a signal related to the output current of said generating circuit, a clamp circuit coupled to said pulse source and clamping the pulses applied to said voltage-generating circuit at a predetermined level, and variable circuit means coupled to said clamp circuit and said sensing means for varying said predetermined level in response to said signal.
Claim 6
Dependent Claim
103 words
A television high-voltage regulator circuit for use with a high-voltage-generating circuit producing a unidirectional high-voltage at an output in response to a series of electrical pulses applied to it from a pulse source, said voltage regulator circuit comprising sensing circuit means coupled to said voltage-generating circuit for producing a signal related to the output current of said generating circuit, a clamp circuit coupled to said pulse source and clamping the pulses applied to said voltage-generating circuit at a predetermined level, and variable circuit means coupled to said clamp circuit and said sensing means for varying said predetermined level in response to said signal.
Claim 7
Dependent Claim
56 words
The television high-voltage regulator circuit of claim 4 wherein said clamp circuit comprises a unidirectionally conductive circuit element and a capacitive circuit element coupled in series relationship between said pulse source and a point of reference potential and said variable circuit means comprises a variable resistance path coupled in parallel relationship with said capacitive circuit element.
Claim 8
Dependent Claim
43 words
The television high-voltage regulator circuit of claim 5 wherein said variable resistance path comprises the collector-emitter circuit of a transistor and the base emitter circuit of said transistor is coupled to said sensing circuit means and forward biased in accord with said signal.
Claim 9
Dependent Claim
81 words
A television circuit comprising: a source of horizontal retrace pulses; a high-voltage generator coupled to said source; sensing means coupled to said high-voltage generator for producinG a signal related to the output current of said generator; clamping means coupled to said source for holding the peak value of said horizontal retrace pulses at a predetermined level; and variable impedance means coupled to said sensing means and said clamping means for varying said predetermined level in response to changes in said signal.
Claim 10
Dependent Claim
81 words
A television circuit comprising: a source of horizontal retrace pulses; a high-voltage generator coupled to said source; sensing means coupled to said high-voltage generator for producinG a signal related to the output current of said generator; clamping means coupled to said source for holding the peak value of said horizontal retrace pulses at a predetermined level; and variable impedance means coupled to said sensing means and said clamping means for varying said predetermined level in response to changes in said signal.
Claim 11
Dependent Claim
35 words
The television circuit of claim 7 wherein said clamping means comprises a unidirectionally conductive circuit element and a capacitive circuit element coupled in series relationship between said source and a first point of reference potential.
Claim 12
Dependent Claim
25 words
The television circuit of claim 8 wherein said variable impedance means comprises a variable resistance path coupled in parallel relationship with said capacitive circuit element.
Claim 13
Dependent Claim
37 words
The television circuit of claim 9 wherein said television circuit further comprises a circuit ground and said variable resistance path is coupled to a second point of reference potential at a voltage higher than said circuit ground.
Claim 14
Dependent Claim
23 words
The television circuit of claim 10 further comprising a regulated voltage supply maintaining said second point of reference potential at said higher voltage.
Claim 15
Dependent Claim
40 words
The television circuit of claim 9 wherein said variable resistance path comprises the collector emitter circuit of a transistor and the base-emitter circuit of said transistor is coupled to said sensing circuit means and biased in accord with said signal.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |