【作 者】Xiao LV, Yue SUN, Zhi-hui WANG, Chun-sen TANG

【摘 要】

In current-fed inductively coupled power transfer (ICPT) systems, voltage distortions and current spikes are easily caused on the semiconductor switches especially when system-parameters vary. This increases the EMI level of the system and the switching loss as well. A quasi sliding mode control (QSMC) method is proposed to improve the dynamic performance of the system by optimization of frequency response. A mathematic model of the system is built up with stroboscopic mapping method and fixed-point theory is applied to get the accurate zero voltage switching (ZVS) frequency. Because of the phase delay caused by the feedback, control and driving circuits, an equivalent model for primary converter is built to figure out the time of phase compensation. Then the QSMC strategy is presented and implemented in developing a prototype current-fed ICPT system. Experimental test results have verified that the proposed control method can regulate the transition of the system to be smooth against wide parameters variations and the spikes on switches have been eliminated effectively.

From:WSEAS TRANSACTIONS on CIRCUITS and SYSTEMS

【关键词】Inductively coupled power transfer, Quasi sliding mode control, Frequency response, Zero voltage switching, Stroboscopic mapping

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