摘要
将三相四桥臂拓扑应用于开关功放当中以增加其集成度,并提出一种通过控制各桥臂节点电位,使三路输出电流跟踪各自给定信号的通用控制方法。该方法可由各桥臂节点的电位直接获得各开关信号的占空比,计算量小,易于实现,并可以推广到任意多桥臂的功率变换器的控制当中。总结出三种典型的电位分配方式,分析了不同的电位分配方式对输出电流的纹波大小和总开关次数的影响,定性地分析了缓冲电路对死区时间的补偿作用。仿真和实验结果均证明了该控制方法的有效性。
To enhance integration degree and power density,three-phase four-leg topology is applied in switching power amplifier.Based on this topology,a general current control scheme is presented.It makes three output currents change respectively to track input signals by controlling the node potential of each leg.And it is easy to obtain the duty cycles of each PWM signal directly from each potential,so the proposed scheme,which can be extended to the control of random multi-leg converter with a neutral leg,needs small arithmetic operations and can be easily implemented.Three representative methods to distribute four node potentials are summarized.Their influences on the current ripples and total switching times are analysed,and the compensation for the dead time effect due to the snubber circuit is also qualitatively analysed.This control method is validated by simulation and experimental results.
出处
《电工技术学报》
EI
CSCD
北大核心
2011年第2期156-164,共9页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(50377012)
关键词
三相四桥臂
功率放大器
电位
占空比
死区
Three-phase four-leg
power amplifier
potential
duty cycle
dead time
