Output power stabilization control strategy of WPT systems based on secondary side circuit

Bo, Bing; Xu, Changfu; Zhang, Ming; Wang, Ruoyin; Jun, Xu

doi:10.1088/1742-6596/1311/1/012018

Cited by 1 publication

(1 citation statement)

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“…A buck converter controlled to switch between CCM and DCM is adopted in the secondary side for maximum power transfer tracking [20], but it cannot realize automated regulation when the coupling coefficient varies. Furthermore, the coupling coefficient identification is added to implement automatic control without wireless communication [21], [22], whereas these methods still depend strongly on the information of coupling coefficient and increase the complexity of secondary side. In addition, the overall efficiency is less than 50% when maximum output power achieves.…”

Section: Introductionmentioning

confidence: 99%

Output Power Stabilization for Wireless Power Transfer System Employing Primary-Side-Only Control

Zhu

Zhang

2020

IEEE Access

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The output power of a wireless power transfer (WPT) system depends highly on the load and the coupling conditions, which are variable in practical applications generally. In order to attain stable output power with high transfer efficiency under various coupling condition and load, this paper proposes a seriesseries compensated WPT system based on parity-time (PT) symmetry with front-end DC-DC converter and a novel primary-side-only control strategy. The strategy comprises the negative resistance control of PT-symmetric circuit, the online load identification approach by PT-symmetry, and the power closed-loop control method. The advantages are that the mutual inductance information is not needed, and dual-side wireless communication as well as the secondary-side control circuit is avoided, which compresses the volume of the secondary side, simplifies the control algorithm, and improves the robustness of the system. With the proposed primary-side-only control strategy, the output power is coupling-independent and can automatically stabilize at specified values over reasonable variations both in coupling coefficient and load. The experimental results obtained from a prototype are included. They confirm the proposed control strategy and indicate that system can stably output 200 W and 400 W with the maximum error 4.10% and 3.40% respectively when the coupling coefficient and loads vary, and achieves high overall efficiency at 91.9%. INDEX TERMS Wireless power transfer (WPT), load identification, coupling-independent, stable output power, high efficiency, parity-time (PT) symmetry.

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Section: Introductionmentioning

confidence: 99%