非对称级联多电平功率放大器的虚拟载波移相PWM调制策略  

A virtual carrier phase shift pulse width modulation strategy for asymmetrical cascaded multilevel power amplifiers

作　　者：岳雨霏 吴兴隆 杨禧 王文[1] 唐欣[1] YUE Yufei;WU Xinglong;YANG Xi;WANG Wen;TANG Xin(School of electrical and information engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410114

出　　处：《电力科学与技术学报》2023年第5期75-86,共12页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(52207186);长沙理工大学研究生实践创新项目(CLSJCX22083)。

摘　　要：由N个相同H桥功率模块(H-bridge power module,HBPM)组成的传统级联H桥功率放大器(cascaded H-bridge power amplifier,CHB-PA)最多可输出2N+1的电平数,输出电平数直接影响功率放大器的正弦特性和保真性能。在级联HBPM数量相同的情况下,首先提出了一种非对称级联多电平功率放大器(asymmetrical cascaded multilevel power amplifier,ACM-PA);其次,为了与传统CHB-PA有相同HBPM数目的ACM-PA,提出一种虚拟载波移相脉宽调制(virtual carrier phase shift pulse width modulation,VCPS-PWM)策略,将输出电平数提高到6N-3;最后,通过仿真对比验证了所提出的ACM-PA和VCPS-PWM可以显著提高输出电平数,降低负载电流的总谐波失真,提高功率放大器的保真性能。Conventional cascaded H-bridge power amplifier(CHB-PA)with N identical H-bridge power modules(HBPMs)could create 2N+1 levels of output voltage at most,and the output voltage level will directly affect the sinusoidal characteristic and fidelity performance of power amplifiers.With the same number of cascaded HBPMs,this paper firstly proposes an asymmetrical cascaded multilevel power amplifier(ACM-PA).Secondly,a virtual carrier phase shift pulse width modulation(VCPS-PWM)strategy is proposed for ACM-PA,which with the same HBPM number as conventional CHB-PA,to increase the output voltage level up to 6N-3.Comparative simulation and experimental results are included to validate that the proposed ACM-PA and VCPS-PWM could obviously increase the output voltage level and decrease the total harmonic distortion(THD)of load current,thus to improve the fidelity performance of power amplifiers.

关 键 词：H桥功率模块 非对称级联多电平功率放大器 虚拟载波移相脉宽调制 高保真性 

分 类 号：TM464[电气工程—电器]