多电平D类功率放大器的工作原理  

Cascade Multilevel Class-D Power Amplifier With the Carrier-Based Phase-Shifted Modulation

作　　者：宋昕 张缨[2] 徐鲁威[2] 董明[2] 

机构地区：[1]海军驻连云港七一六所军事代表室,江苏连云港222006 [2]海军装备研究院,北京100161

出　　处：《指挥控制与仿真》2013年第1期135-140,共6页Command Control & Simulation

摘　　要：介绍了一种新颖的高效水池试验声纳用基于级联型多电平拓扑结构的开关型功率放大器，采用单极倍频相移PWM技术，其开关频率是单个单元开关频率的2N倍，总的输出电压波纹小，比较了采用相移PWM技术和位移PWM技术的多电平输出信号的性能特点，分析了级联型多电平D类功率放大器的工作原理，之后研制了一台级联型多电平的D类功率放大器。研究结果表明，采用单极倍频相移三角载波PWM法的级联型多电平D类功率放大器具有良好的跟踪性和稳定性。A novel switch-mode power amplifier based on a cascade multicell multilevel circuit topology is introduced. By applicating of the multicell topology concept being operated in a unipolar phase-shifted PWM control switch-mode amplifier system, the effective switching of output results is 2N times the switching frequency of each full-bridge. Due to the Carrier Based phase-shifted modulation of the individual switching cells, the output voltage ripple of the total system is considerably small. The paper analyzes the advanced characteristic of cascade multilevel technique. Two carrier-based PWM schemes, phase-shifted and level-shifted modulations are analyzed and their performance is compared, and then a cascade multilevel class-D power amplifier is built in the laboratory. The results of measurements show an excellent response and stability.

关 键 词：D类功率放大器 多电平控制 相移PWM模式 

分 类 号：TM464[电气工程—电器] E933[军事—军事装备学]