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US 4,081,721 AGranted
Conduction overlap control circuit for switched output stages
AssigneeRCA Corporation
InventorPeter Eduard Haferl
Life of this patent
Estimating the term…
Abstract
A negative-feedback arrangement for a switched-mode vertical deflection circuit automatically controls the duration of that overlap portion of the vertical trace interval in which simultaneous conduction of the vertical deflection control switches occurs.
Claims7
Feedback overlap control means for a television kinescope drive apparatus comprising:
- a horizontal deflection circuit for producing a recurrent horizontal deflection drive signal;
- a vertical deflection winding disposed about the kinescope for deflecting an electron beam of the kinescope vertically in response to current therethrough;
- a source of recurrent vertical-frequency sawtooth signal;
- vertical deflection means responsive to said vertical-frequency sawtooth signal for applying successively smaller portions of the energy of said horizontal deflection drive signal during a first interval of the vertical deflection period and successively greater portions of the energy of said horizontal deflection drive signal during a second interval of the vertical deflection period to said vertical deflection winding for producing a vertical-frequency sawtooth current therethrough, a predetermined contemporaneity of said first and second intervals being optimum;
- said feedback overlap control means further comprising;
- summing and signal processing means responsive to said vertical-frequency sawtooth current and to said vertical frequency sawtooth signal for generating at an output terminal a first error signal indicative of the contemporaneity of said first and second intervals, and
- error signal coupling means for coupling said first error signal to said vertical deflection means for reducing the difference between the contemporaneity and said predetermined contemporaneity.
4 more elements
Feedback overlap control means for a television kinescope drive apparatus comprising:
- a horizontal deflection circuit for producing a recurrent horizontal deflection drive signal;
- a vertical deflection winding disposed about the kinescope for deflecting an electron beam of the kinescope vertically in response to current therethrough;
- a source of recurrent vertical-frequency sawtooth signal;
- vertical deflection means responsive to said vertical-frequency sawtooth signal for applying successively smaller portions of the energy of said horizontal deflection drive signal during a first interval of the vertical deflection period and successively greater portions of the energy of said horizontal deflection drive signal during a second interval of the vertical deflection period to said vertical deflection winding for producing a vertical-frequency sawtooth current therethrough, a predetermined contemporaneity of said first and second intervals being optimum;
- said feedback overlap control means further comprising:
- signal processing means responsive to the duration of that portion of said first interval of the vertical deflection period common with said second interval of the vertical deflection period for generating at an output terminal a first error signal indicative of the contemporaneity of said first and second intervals, and
- error signal coupling means for coupling said first error signal to said vertical deflection means for reducing the difference between the contemporaneity and said predetermined contemporaneity.
4 more elements
Dependencies are inferred from the claim text.