Development of a LED light therapy device with power density control using a Fuzzy logic controller.

Journal: Medical engineering & physics
PMID: 33261736

Abstract

The biological effects of a light-emitting diode (LED) light therapy device are determined by irradiation parameters, mainly wavelength and power density. However, using a battery to provide power causes a problem in the variation of LED power density during battery discharge. As a result, maintaining a stable LED power density, along with extending battery life and operating time, are the primary concerns in designing a LED light therapy device. The present study aims to introduce a LED light therapy device design with different LED color power density control. A Fuzzy logic, based on the relationship between LED power density and operating time, was proposed to control constant power density in this design. The experimental results demonstrate that by using the designed controller, the LED light therapy device's power density (40 mW/cm, 50 mW/cm, 60 mW/cm for red, blue, and green light, respectively) can be controlled. The newly designed LED light therapy device could be considered an advanced version with energy savings and stabilized LED power emitting property under a broad range voltage variation.

Authors

  • Duc Tri Phan
    Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Republic of Korea.
  • Ngoc Thang Bui
    Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Republic of Korea.
  • Tan Hung Vo
    Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Republic of Korea.
  • Sumin Park
    School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea.
  • Jaeyeop Choi
    Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Republic of Korea.
  • Sudip Mondal
    Biomedical Engineering, Pukyong National University, Republic of Korea.
  • Byung-Gak Kim
    College of Future Convergence, Pukyong National University, Busan 48513, Republic of Korea.
  • Junghwan Oh
    Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Republic of Korea; Biomedical Engineering, Pukyong National University, Republic of Korea; Ohlabs Corporation, Busan 48513, Korea.. Electronic address: jungoh@pknu.ac.kr.

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