Protection circuit for a cathode ray tube
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United States of America Patent
Stats
-
Feb 18, 1992
Grant Date -
N/A
app pub date -
Apr 30, 1990
filing date -
Apr 30, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit for protecting a cathode ray tube screen from damage by an electron beam includes a semiconductor switch device having an input coupled to a signal related to a deflection signal for the electron beam. The switch device is coupled to a voltage supply and the circuit further includes a charge storage device coupled to the switch device and further coupled to a control grid of the cathode ray tube. The charge storage device is charged through the switch device by the voltage supply when the deflection signal is present at a control input of the switch device. The switch device decouples the supply voltage from the charge storage device when the deflection signal is not present and places a negative blanking voltage developed on the charge storage device across the control grid when the deflection signal is not present to cut-off beam current in the cathode ray tube.
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