| 摘要 |
PURPOSE:To reduce the cost with the simplification of circuit constitution and also to improve the accuracy and the processing speed against the generation of the abnormal voltage. CONSTITUTION:The induced voltage of the detected winding 23 of a flyback transformer 19 is converted into the DC voltage by a detection circuit 17 when the abnormal voltage occurs at a CRT 24. Then the DC voltage is converted into the digital value by an A/D converter included in a microcomputer 7. When the digital value continuously exceeds a threshold level by three times, the coil 2b of a relay circuit 2 is de-energized by the microcomputer 7. Then the microcomputer 7 opens a contact 2a to interrupt the supply of the AC power to a power circuit 3. In such constitution, a capacitor, a reference power supply, a comparator, etc., can be eliminated. Thus, the cost can be reduced and high processing speed is secured at the time of generating the abnormal voltage for the X-ray protector circuit. |
