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Primary Examiner: Martin, John C.
Assistant Examiner: Psitos, Aristotelis M.
Attorney: Whitacre; Eugene M., Meagher; William H., Kurdyla; Ronald H.

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Title: Automatic beam current limiter with independently determined threshold level and dynamic control range

Abstract: Apparatus for automatically limiting excess beam current conduction of a kinescope in a television signal processing and reproducing system. A control network including an active device (e.g., a transistor) provides a control signal representative of the magnitude of beam current conduction when above a predetermined threshold level. A dynamic operating control range of the active device is determined independent of a threshold control level of the active device by means of a degenerative direct current feedback network associated with the active device. The control signal is coupled to the kinescope for opposing excess current conduction thereof.

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Inventors: Serafini, Joseph J. (Indianapolis, IN, US)

Application Number: 794126
Filing Date: 1977-05-05
Publication_date: 1979-01-30
Assignee: RCA Corporation (New York, NY)
Primary Class(es): 348/380
Other Classes:
US Patent Ref:

3674932	Jul, 1972	Griepentrog	358/243.
3804981	Apr, 1974	Avins	358/243.
3914545	Oct, 1975	Engel	358/243.

Other Refs: Other References: Engineering Electronics by Ryder; McGraw-Hill Book Co., .COPYRGT.1957, pp. 183-188.