Abstract
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 series-series 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%.
Highlights
Wireless power transfer (WPT) technology, which allows power transfer from one side to another without any electrical wires, has attracted lots of attention as an alternative technology for domestic and industrial applications in the last two decades due to its critical merit of safety, flexibility and isolation
Many pieces of research therein focus on the constant output voltage (CV) and constant output current (CC) charging through complicated control methods or high-order compensations [4], [5] whereas the output power stabilization of the WPT system is essential in practical applications
Through the full-bridge rectifier with capacitive output filter, the obtained AC voltage u2 is converted to DC voltage Uo for household applications, battery charging and other power converters et al The purpose of this paper is to propose and verify a WPT system and its output power stabilization control strategy so that the DC resistance is used as the load in analysis
Summary
Wireless power transfer (WPT) technology, which allows power transfer from one side to another without any electrical wires, has attracted lots of attention as an alternative technology for domestic and industrial applications in the last two decades due to its critical merit of safety, flexibility and isolation. Many pieces of research therein focus on the constant output voltage (CV) and constant output current (CC) charging through complicated control methods or high-order compensations [4], [5] whereas the output power stabilization of the WPT system is essential in practical applications. Examples of such applications include the WPT systems for constant power charging [6], [7], dynamic charging [8], [9], powering different electrical devices but at a same rated power, and powering constant power load [10], [11].
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