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Journal Article
Duty and Phase Control of a Self-Synchronized Class E Rectifier for High-Frequency Wireless Power Transfer System
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- Authors
- Minki Kim
- Issue Date
- 2025-04
- Citation
- IEEE Transactions on Power Electronics, v.40, no.4, pp.6296-6306
- ISSN
- 0885-8993
- Publisher
- Institute of Electrical and Electronics Engineers
- Language
- English
- Type
- Journal Article
- Abstract
- This article proposes a high-frequency (HF) wireless power transfer (WPT) system using duty and phase control of a self-synchronized class E rectifier considering the nonlinear internal capacitance of field-effect transistors (FETs). In HF WPT systems (> 13.56,MHz), the self-synchronized class E rectifier provides a precise gate signal by compensating for the propagation delay. However, when controlling the output power of the HF WPT system, the nonlinear capacitance Coss of FETs distorts the shape of the drain-voltage waveform, which reduces the efficiency due to nonzero-voltage switching or partial diode operation. To mitigate this issue, we propose an α (=duty ratio) and β (=phase delay) control method for a self-synchronized class E rectifier while considering the nonlinear Coss of FET. To achieve robust control and performance of the HF WPT system, we employed a regression method to estimate the value of Coss more accurately. Specifically, considering the impact of Coss on the performance of the HF WPT system, we selected two optimized control points Pmax and Pmin and developed a first-order polynomial equation representing the relationship between α and β. Following the determined αβ relationship, the output power of the WPT was adjusted by hysteresis control while maintaining the highest efficiency. In the experimental validation, the proposed WPT system achieved a conversion efficiency of 82% to 76% in the 160-90 W output power range. Finally, the effectiveness of the proposed control method was also verified in closed-loop control during dynamic operation from 160 to 100,W, with a minimal ripple (1.7%) in the output power.
- KSP Keywords
- Control Points, Conversion efficiency(C.E.), Duty ratio, Dynamic operation, Field Effect Transistor(FET), First-order, High frequency(HF), Hysteresis Control, Nonlinear capacitance, Output power range, Phase control