High voltage shutdown circuit with brightness tracking
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United States of America Patent
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-
Aug 8, 1989
Grant Date -
N/A
app pub date -
Jul 22, 1988
filing date -
Jul 22, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high voltage shutdown circuit that tracks with brightness changes in the CRT. An ABL (automatic brightness level) signal is applied to adjust the conduction point of a latch transistor that is connected in a trigger arrangement with a zener diode and driven by a sensing winding on a high voltage transformer. The ABL voltage is applied to an inverting transistor and an opposite polarity potential is developed across a capacitor connected in series with the latch transistor. Because of the loading on the high voltage generating means, the voltage across the sensing winding does not accurately reflect the actual high voltage at the CRT and the circuit prevents premature high voltage shutdown under high beam current conditions.
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