CRT protector circuit

Details CRT protector circuit CRT protector circuit

1994-01-05

1995-07-04

Deboer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 89, 361 94, 315411, 348377, H01J 2970

Patent

active

054305969

ABSTRACT:
A CRT protector circuit for detecting an overcurrent or an overvoltage to a CRT to protect the CRT. A detector circuit is provided for detecting the overcurrent and the overvoltage, and when such is detected an abnormality detection output from the detector circuit is supplied to a control circuit which in turn controls a horizontal output circuit. The operation of the horizontal output circuit, provided on a primary side of a flyback transformer is, instantaneously broken by the control circuit according to the abnormality detection output from the detector circuit. When the frequency of generation of the abnormality detection output becomes a predetermined value or more, the operation of the horizontal output circuit is continuously inhibited. Accordingly, when the abnormal condition is temporary, a normal high-voltage generating operation can be automatically restored.

REFERENCES:
patent: 4126816 (1978-11-01), Willis
patent: 4321513 (1982-03-01), Knight
patent: 4441137 (1984-04-01), Harwood

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