Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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A Study on the Hybrid-Dimming Control Driving of LED Lighting System for Machine Vision

머신비전용 LED 조명 장치를 위한 Hybrid-Dimming Control에 대한 연구

  • Kim, Tae-Hwa (Department of Electrical Engineering, Inha University) ;
  • Lee, Cheon (Department of Electrical Engineering, Inha University)
  • 김태화 (인하대학교 전기공학과) ;
  • 이천 (인하대학교 전기공학과)
  • Received : 2021.01.09
  • Accepted : 2021.03.29
  • Published : 2021.05.01
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Abstract

A machine vision inspection system consists of a camera, optics, illumination, and image acquisition system. The illumination system among these uses LED lighting source. Therefore, the driving method of LED lighting source is very important. The two main driving methods of LED lighting system for machine vision are Pulse Width Modulation (PWM) control driving and strobe control driving. PWM control driving method has problems such as a temperature rising of LED and a flickering in image measurement for inspection. On the other hand, strobe control driving method has a difficulty in the control of light intensity because of too short on-time. In this study, we propose a new hybrid-dimming control driving method for LED lighting source for machine vision. The proposed new hybrid-dimming control driving method can control current intensity and current on-time simultaneously so that it can extract clearer images with a high precision without the light saturation of image.

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References

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