基于GaN器件的包络跟踪电源设计  

Design of Envelope Tracking Power Supply Based on GaN Devices

作　　者：崔文奇 张政权[1] CUI Wenqi;ZHANG Zhengquan(School of Physical Science and Technology,Southwest Jiaotong University,Sichuan 611756,China)

机构地区：[1]西南交通大学物理科学与技术学院,四川611756

出　　处：《电子技术（上海）》2024年第4期4-9,共6页Electronic Technology

摘　　要：阐述针对半桥D类音频功放因固定电压高于实际需要的电压而导致能效降低的问题,提出一种基于GaN器件的全桥LLC谐振变换器的双极性对称输出音频包络跟踪电源。该电源采用调频与移相混合控制策略实现宽电压输出范围,并利用扩展函数描述法对系统进行建模分析,进行系统优化设计和闭环补偿设计,实现高带宽的稳定系统。仿真结果表明,该包络跟踪电源能够精确跟踪参考电压的变化,在不同频率和幅值范围内保持输出波形的稳定性和精度。This paper describes that Aiming at the problem of reduced energy efficiency caused by the fixed voltage of the half-bridge D-class audio power amplifier being higher than the actual required voltage,a bipolar symmetric output audio envelope tracking power supply based on GaN devices and a full-bridge LLC resonant converter is proposed.The power supply uses a mixed control strategy of frequency modulation and phase shifting to achieve a wide voltage output range.The system is modeled and analyzed using the extended function description method,and the system is optimized and closedloop compensation design is carried out to achieve a high-bandwidth and stable system.Simulation results show that the proposed envelope tracking power supply can accurately track the variation of the reference voltage and maintain the stability and accuracy of the output waveform in different frequency and amplitude ranges.

关 键 词：LLC谐振变换器 扩展函数描述法 包络跟踪电源 混合控制 

分 类 号：TM46[电气工程—电器]