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

Duc Tri Phan; Ngoc Thang Bui; Tan Hung Vo; Sumin Park; Jaeyeop Choi; Sudip Mondal; Byung-Gak Kim; Junghwan Oh

doi:10.1016/j.medengphy.2020.09.008

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

Med Eng Phys. 2020 Dec:86:71-77. doi: 10.1016/j.medengphy.2020.09.008. Epub 2020 Sep 24.

Authors

Duc Tri Phan¹, Ngoc Thang Bui¹, Tan Hung Vo¹, Sumin Park¹, Jaeyeop Choi¹, Sudip Mondal², Byung-Gak Kim³, Junghwan Oh⁴

Affiliations

¹ Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Republic of Korea.
² Biomedical Engineering, Pukyong National University, Republic of Korea.
³ College of Future Convergence, Pukyong National University, Busan 48513, Republic of Korea.
⁴ 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.

PMID: 33261736
DOI: 10.1016/j.medengphy.2020.09.008

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/cm², 50 mW/cm², 60 mW/cm² 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.

Keywords: Fuzzy logic; LED light therapy device; LED power density control.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Fuzzy Logic*
Humans
Phototherapy*