Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1987-09-28
1989-06-20
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
358243, 315411, H02H 320
Patent
active
048414069
ABSTRACT:
An X-radiation protection circuit in a television receiver is responsive to both high voltage and high beam current conditions. A first detector is interconnected with an electron beam power source and monitors the beam current therefrom. The first detector produces a first voltage proportional in magnitude to the electron beam current. A second detector monitors a high voltage transformer that produces a potential for operating on the electron beam and the second detector produces a second voltage that is proportional in magnitude to the high voltage potential. A monitoring circuit constantly monitors both the first and second voltages and produces a trigger signal whenever the additive sum of the first and second voltages exceeds a selected magnitude. In this manner, a trigger signal indicates an excessively high combination of electron beam current and high voltage. This circuit is constantly responsive to both high voltage and electron beam current. In addition, a hold down circuit operates independently of the first and second detectors to produce the trigger signal whenever the high voltage potential exceeds a predetermined magnitude.
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Jennings Derek S.
North American Philips Consumer Electronics Corp.
Rich Marianne R.
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