Fuzzy self‑tuning PID control of MC3 LLC resonant LED drivers

Vol. 21, No. 5, pp. 782-791, May  2021


An MC3 LLC resonant light-emitting diode (LED) driver is a multi-channel constant current (MC3) output solution based on LLC resonance. Through an effective combination of multiple transformers and a DC block capacitor, this driver allows constant current outputs in multiple channels when the LED channels are unbalanced. This study considers a fuzzy selftuning proportional integral derivative (PID) control strategy that allows for the self-tuning of PID parameters according to fuzzy inference rules designed using the relationship between the current gain and the switching frequency. Thus, when LED channels are unbalanced, the system allows a constant current output for each of the channels and controls the input voltage disturbances well. Simulation and experimental verifications are carried out, and a 20 W 4-channel constant current power supply design based on LLC resonance is obtained for the LED driver. This realizes soft-switching of the switching device, which reduces system loss and improves system efficiency. Moreover, the adjustment time of the proposed method is half that of fixed-parameter control methods, and the overshoot of the proposed method is smaller than that of fixed-parameter control methods. When compared with PID controllers with fixed parameters, the proposed method is more robust. When a system is disturbed, it recovers faster and has a smaller range of current fluctuation with the proposed method.

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Cite this article

[IEEE Style]

D. Li, Y. Lu and X. Ge, "Fuzzy self‑tuning PID control of MC3 LLC resonant LED drivers," Journal of Power Electronics, vol. 21, no. 5, pp. 782-791, 2021. DOI: 10.1007/s43236-021-00233-9.

[ACM Style]

DeLong Li, Yimin Lu, and Xin Ge. 2021. Fuzzy self‑tuning PID control of MC3 LLC resonant LED drivers. Journal of Power Electronics, 21, 5, (2021), 782-791. DOI: 10.1007/s43236-021-00233-9.