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Start Over Author "Min, Run" Journal ieee transactions on power electronics
10 results on '"Min, Run"'

3. Optimal Duty Ratio Assisted PFM Control for VHF Isolated Class E DC-DC Converter

Author

Zhang, Desheng, Lu, Liangliang, Song, Wei, Min, Run, Tong, Qiaoling, Zhang, Qiao, Peng, Han, and Zhou, Keliang

Abstract

This article presents an optimal duty ratio assisted pulse frequency modulation control for very high frequency isolated class E dc–dc converter to achieve both continuous power flow and optimal switch timing. The continuous power flow significantly reduces output ripple of the converter, while the optimal switch timing guarantees consistent zero-voltage-switching (ZVS) and minimized reverse conduction loss. To pave the way for the proposed control, a resonant fitting model is established for deriving the optimal duty ratio and output power under dynamic switching frequency. The optimal duty ratio is calculated according to zero-crossing points of the switching node voltage (vds), and it aims to turn on the power switch once vds reaches zero. This ensures consistent ZVS while preventing reverse conduction of gallium nitride (GaN) high electron mobility transistor (HEMT) when the switching frequency changes. Furthermore, the proposed control is integrated with on/off modulation to extend load range of the converter. A 10–18 MHz prototype is built to verify effectiveness of the proposed control. Compared with conventional PFM control, the proposed control reduces the power loss by 35.9% at 40% load while maintains continuous power flow.

Published
2023
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6. Harmonic Weighting and Target Function Design Strategy to Minimize Switch Voltage Stress of Class Φ 2 Inverter.

Author

Zhang, Desheng, Lu, Liangliang, Tong, Qiaoling, Zhang, Qiao, Min, Run, Peng, Han, and Zou, Xuecheng

Subjects
VOLTAGE, IDEAL sources (Electric circuits), HARMONIC distortion (Physics), ELECTROSTATIC induction
Abstract

For very high frequency (VHF) class Φ2 inverter, conventional design method requires complex tuning for parameters. Without fully quantitative calculations, the tuning highly depends on experience that cannot achieve optimal design. In this article, a target function design strategy is proposed based on quantitative harmonic weighting, which simplifies the design procedures and minimizes the switch voltage stress. First, the target switch voltage with minimized peak value is derived by optimizing the harmonic weighting. With the result, the power switch is modeled as a voltage source to simplify the calculations, where the branch currents are solved to provided fully quantitative analysis. Based on the analysis, optimal features of switching node impedance are derived to achieve the target switch voltage. In addition, basic constrains of the resonant tank are analyzed to reduce circling currents. Combining the optimal features and basic constrains of the resonant tank, the circuit parameters are calculated directly, which minimizes the switch voltage stress and improves power efficiency. Compared with conventional design, a 27.12 MHz prototype demonstrates 10.2% reduction in average switch voltage stress and 7.2% improvement in average efficiency. [ABSTRACT FROM AUTHOR]

Published
2022
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