X-ray protector

Details X-ray protector X-ray protector

1994-05-03

1996-10-01

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, 324522, 324404, H02H 320

Patent

active

055615783

ABSTRACT:
The invention tests the operation of a CRT X-ray protector circuit without applying an abnormally high voltage to the CRT. In addition to a first reference voltage corresponding to the detected voltage which is the standard for the operation of the X-ray protector for use in a display device with the CRT, a second reference voltage set at a value lower than the first reference voltage and higher than 0 V is provided to enable the operation of the X-ray protector circuit by comparing the detected voltage with the second reference voltage at the time of testing the X-ray protector circuit's operation. A third reference voltage, higher than the first reference voltage, is compared to the detected voltage during channel switching or external input switching to prevent erroneous activation of the x-ray protector.

REFERENCES:
patent: 4601051 (1986-07-01), Santurtun et al.
patent: 4809125 (1989-02-01), Matsko et al.

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