Protection circuit for a cathode ray tube

Details Protection circuit for a cathode ray tube Protection circuit for a cathode ray tube

H - Electricity

04

N

H04N 3/24 (2006.01) H04N 3/20 (2006.01)

Patent

CA 2041228

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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