Self-Oscillating Converter Based on Phase Tracking Closed Loop for a Dynamic IPT System

Lin Chen, Daqing Luo, Jianfeng Hong (), Mingjie Guan and Wenxiang Chen ()
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Lin Chen: Xiamen Kehua Digital Energy Tech Co., Ltd., Xiamen 361000, China
Daqing Luo: Department of Instrumental and Electrical Engineering, Xiamen University, Xiamen 361005, China
Jianfeng Hong: School of Automative and Mechanical Engineering, Xiamen University of Technology, Xiamen 361005, China
Mingjie Guan: Department of Instrumental and Electrical Engineering, Xiamen University, Xiamen 361005, China
Wenxiang Chen: Department of Instrumental and Electrical Engineering, Xiamen University, Xiamen 361005, China

Energies, 2024, vol. 17, issue 8, 1-24

Abstract: The coupling of converters with resonant networks poses significant challenges for frequency tracking and power control in inductive power transfer (IPT) systems. This paper presents an implementation method that addresses these issues by dividing the system’s operation into two distinct states: self-oscillating and power-injecting. Based on these states, a phase-closed loop is constructed. Within this closed loop, the phase tracking unit detects and tracks frequency drift, while the power regulating unit incorporates an integrator and adopts a control variable to adjust the output power by modifying the duration of the power injecting state. Meanwhile, the oscillating unit operates in the self-oscillating state. Operating in this manner, the system achieves self-oscillation and demonstrates the capability to effectively track and compensate for system variations within a single cycle. A verification prototype has been constructed, and it demonstrates that the converter within it completely decoupled from the resonant network. Experimental results validate that altering the control variable solely affects the duration of the power-injecting state, allowing for independent control of the output power. When the control variable changes from 2.0 V to 3.5 V, the output power changes from 178 W to 519 W while the self-oscillating state remains unchanged. Furthermore, the system accurately tracks frequency changes, even under significant variations in the coupling coefficient or load, without compromising the power injection state. When the air gap changes from 3 cm to 12 cm, the duration of the self-oscillating state changes from 22.1 μs to 26.3 μs, while the power injecting state remains unchanged. This approach exhibits a robust performance, particularly suitable for dynamic IPT systems sensitive to parameter variations.

Keywords: dynamic system; inductive power transfer; phase-closed loop; self-oscillating (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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