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Modular Multilevel Envelope-Tracking Power Supply Based on GaN Devices
投稿时间:2020-07-09  修订日期:2020-09-01
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Keywords:envelop-tracking power supply  envelope elimination and restoration (EER)  multilevel converter  capacitor voltage balancing  GaN devices
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AuthorInstitutionEmail
WANG Kui Tsinghua University wangkui@tsinghua.edu.cn
ZHANG Liang zhangliang1728@263.net
WANG Chao wangchao16@mails.tsinghua.edu.cn
SUN Kai sun-kai@tsinghua.edu.cn
ZHENG Zedong zzd@tsinghua.edu.cn
LI Yongdong liyd@tsinghua.edu.cn
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Abstract:
      Envelope elimination and restoration (EER) technique is an effective method to improve the efficiency of radio-frequency power amplifier with non-constant envelope modulation. The key equipment of EER technique is the high tracking precision, high bandwidth and high efficiency envelop-tracking power supply. In order to improve the tracking precision, bandwidth and efficiency, a multilevel envel-op-tracking power supply circuit with modular structure is proposed in this paper. Two half-bridge cells are stacked to form a three-level sub-module first and powered by an isolated DC source. Several three-level sub-modules are series connected and modulated by phase-shifted PWM (PSPWM) secondly, then multilevel output voltage can be obtained. Due to the increase of equivalent switching frequency and the reduction of stair voltage by increasing the number of voltage levels, the tracking precision and bandwidth can be improved. A capacitor voltage balancing method based on adjusting the duty ratios of PWM signals is also proposed to solve the capacitor voltage imbalance problem of each three-level sub-module. A five-level envelop-tracking power supply prototype based on GaN devices with 500W peak power, 1MHz switching frequency and 400kHz bandwidth is designed. The experimental results are presented to verify the effectiveness and feasibility of the proposed topology and control method.
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