Phosphor protection circuit for multiple CRT projection televisi

Details Phosphor protection circuit for multiple CRT projection televisi Phosphor protection circuit for multiple CRT projection televisi

1981-01-02

1981-10-27

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358 60, H01J 2952

Patent

active

042976197

ABSTRACT:
A system for preventing CRT phosphor burn in a multiple CRT projection type television system is disclosed. The absence of an electron beam deflection signal in the deflection yoke of a CRT is detected and used to provide a signal to CRT shutdown circuitry by means of an unbalanced transformer approach in which the various deflection yoke signals energize a plurality of primary transformer coils with a shutdown signal provided by the transformer secondary when a primary coil flux unbalance occurs.

REFERENCES:
Quasar Electronics Co. Chassis AMVDTS-800 Service Manual, Model No. PR6800QW, 1978.

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