Monitor X-ray protection device

Details Monitor X-ray protection device Monitor X-ray protection device

1998-11-10

2000-06-13

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 86, 361 90, 361 913, H02H 320

Patent

active

06075687&

ABSTRACT:
An X-ray protection device adapted to be incorporated into a monitor that includes a cathode ray tube actuated by a high voltage from a transformer powered by a low voltage power supply. The X-ray protection device includes a circuit which is coupled to a low voltage output of the transformer to obtain a signal from the transformer to represent the high voltage applied by the transformer to the cathode ray tube. The signal is then voltage divided and analog-to-digital-converted to supply a digital signal to a microprocessor which receives and processes the digital signal to give a comparison result by comparing the digital signal with predetermined upper and lower bounds and a triggering threshold and a switching circuit which is connected to the microprocessor to be actuated by the microprocessor in response to the comparison result to cut off the power supplied to the transformer in order to shut down the monitor if the digital signal is not between the upper and lower bounds or is greater than the threshold for a time period greater than a predetermined time interval.

REFERENCES:
patent: 5430596 (1995-07-01), Hamaguchi et al.
patent: 5561578 (1996-10-01), Shimoyanagida

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