High voltage protecting circuit

Details High voltage protecting circuit High voltage protecting circuit

H - Electricity

02

H

355/26, 317/12.9

H02H 3/20 (2006.01) H04N 3/185 (2006.01)

Patent

CA 1272302

ABSTRACT OF THE DISCLOSURE A high voltage protecting circuit in a cathode ray tube apparatus which comprises a main power switch adapted to be connected in series with an electric power source, a flyback transformer having primary, secondary and third windings, a rectifying circuit connected with the main power switch for rectifying a power source voltage originating from the power source and to be supplied to the flyback transformer, a switching device connected between the main power switch and the rectifying circuit and provided with a control terminal, and a high voltage detecting and controlling device for comparing an output voltage, produced across the third winding of the flyback transformer, with a reference voltage and for generating a control signal when the output voltage exceeds the reference voltage. The control signal is utilized to hold the switching device in an OFF position.

541601

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