大功率交流供电LED工业X射线观片灯设计

摘要

Radiation detection is one of the commonly used methods in non-destructive testing industry , and industrial X-ray film needs to have high blackness in order to keep the contrast ratio , so the film viewer needs high brightness to meet the assessment of high blackness film .This paper designed a kind of high power LED film viewer based on PT4207 driver, supplying by AC power , PWM dimming by capacitive touch input , and fan speed controlled by temperature automaticly .The film viewer uses high power LED as its light source , its brightness is adjustable to meet the assessment of different blackness level .With its high efficiency, long life, energy saving, environmental protection, easy operation, and other advantages, the film viewer has very high use value .%射线检测是无损检测行业常用的方法之一, 工业X射线检测底片需有较高的黑度以保证底片的对比度,观片灯需要高亮度以满足高黑度底片的评片需求. 本文设计一种基于PT4207 驱动芯片的大功率LED观片灯, 采用交流市电供电, 电容触摸输入PWM调光, 温控风扇自动调速. 观片灯采用大功率LED为光源, 亮度可调适应不同黑度级别的底片评片需求, 兼有效率高、 寿命长、 节能环保及操作方便等优点, 具有很高的使用价值.