Abstract
This paper aims to focus on the smooth output of DC-DC buck converters in wireless power transfer systems under input perturbations and load disturbances using the high-order sliding mode controller (HOSM) and HOSM with super-twisting differentiator (HOSM + STD). The proposed control approach needs only measurement of converter output voltage. Theoretical analysis and design procedures, as well as the super-twisting differentiator of the proposed controller are presented in detail with the prescribed convergence law of high-order sliding modes. Comparisons of both simulation and experimental results among conventional proportional-integral (PI) control, traditional sliding mode control (SMC), HOSM and HOSM + STD under various test conditions such as steady state, input voltage perturbations and output load disturbances, are presented and discussed. The results demonstrate and validate the effectiveness and robustness of the proposed control method.
Highlights
Wireless power transfer has become a research focus during the last decade, due to its safety and convenience [1,2]
Due to the uncertainties of power source and load demand in such applications, the DC-DC converters always face the problem of maintaining a smooth output voltage under the circumstances of input voltage perturbations and load disturbances
The main objective of this paper is to propose an innovative controller design to ensure smooth voltage output of a DC-DC buck power converter under the input perturbations and load disturbances
Summary
Wireless power transfer has become a research focus during the last decade, due to its safety and convenience [1,2]. According to the experimental results in [6,7], the receiver output voltage varies with the distance, lateral misalignments and angular misalignments between the transmitter and the receiver. In order to better power the load, a DC-DC converter is often added to regulate the receiver output voltage [8,9]. Due to the uncertainties of power source and load demand in such applications, the DC-DC converters always face the problem of maintaining a smooth output voltage under the circumstances of input voltage perturbations and load disturbances. It has been demonstrated in the literature that traditional linear controllers cannot cope with this problem appropriately.
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