Turn-off circuit for projection television CRT

Details Turn-off circuit for projection television CRT Turn-off circuit for projection television CRT

1987-02-24

1988-02-02

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358243, 358220, 315381, H04N 563

Patent

active

047231670

ABSTRACT:
A shutdown circuit for a projection type CRT comprises a transistor switch for operating a relay, responsive to a turn-off signal, to immediately break the high B+ operating voltage connection to a horizontal deflection system. A switched mode power supply is supplied with the turn-off signal, after a delay caused by a resistance-capacitance circuit, for shutting down the low voltage drive voltage to the horizontal deflection system after occurrence of the turn-off signal.

REFERENCES:
patent: 2155486 (1939-04-01), Gunther
patent: 3351804 (1967-11-01), Kongable et al.
patent: 3535445 (1970-10-01), Griffey
patent: 3956669 (1976-05-01), Del Ciello
patent: 4521720 (1985-06-01), Griffey
patent: 4677351 (1987-06-01), Brust et al.

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