Abstract
In order to adapt to the dimming characteristics of load led lamp, and to solve the shortcomings of slow dynamic response and poor dynamic performance on control parameter of the traditional PI control, a sliding-mode controller based on half-bridge LLC resonant converter with current negative feedback is studied in this paper. Two fixed frequencies are set according to the constant current characteristic of the LED lamp, and the switching of the working state under the two operating frequencies of the LLC converter is realized by sliding-mode control. The LED lamp dimming can be realized when the reference current is changed. In this paper, the large-signal model of LLC resonant converter is derived based on the extended description function method, and the sliding surface equations and control parameters of the system are deduced according to the model of the system. Then, the simulation circuit of 240 W LLC resonant converter with PI control and sliding-mode control is built. According to the simulation results, when the load current jumps, the response speed of sliding-mode control is faster than that of PI control, the dynamic performance of sliding-mode control is higher, and the system is more robust.
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© 2016 Springer Science+Business Media Singapore
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Sun, Kh., Cao, Sy., Fang, Y., Zheng, Jy. (2016). Research on Sliding-Mode Control Technology of High-Performance LED Lighting Circuit. In: Jia, Y., Du, J., Zhang, W., Li, H. (eds) Proceedings of 2016 Chinese Intelligent Systems Conference. CISC 2016. Lecture Notes in Electrical Engineering, vol 405. Springer, Singapore. https://doi.org/10.1007/978-981-10-2335-4_33
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DOI: https://doi.org/10.1007/978-981-10-2335-4_33
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