基于FPGA的多电平多载波PWM脉冲发生原理及实现方式

FPGA-based Multi-level Multi-carrier PWM Pulse Generation Theory and Its Implementation Method

多单元串联型多电平逆变器越来越广泛地应用于高压大功率工业应用场合,其拓扑结构的特殊性决定需要多路驱动脉冲。因此,多路驱动脉冲的发生便成为拓扑所研究的关键性技术之一。针对H桥串联型多电平逆变器,详细地叙述了多载波脉冲的发生原理,基于FPGA,给出了一种通用型多载波脉冲发生器的具体实现方式。最后,基于DSP与FPGA,搭建了一套多电平逆变器数字化实验系统。实验结果表明所构造的多载波PWM脉冲发生器具有很好的扩展性与通用性。

Multi-module cascaded multi-level inverters are more and more widely used in high voltage large power industrial applications and its unique topological structure requires multi-channel drive pulse.Therefore,generating multi-channel drive pulse becomes one of the key issues.With respect to H-bridge cascaded multi-level converter,this paper presents a detailed description of the principle for the generation of multi-carrier pulses,and based on FPGA,gives a specific implementation method for a general-purpose multi-carrier pulse generator.Finally,a set of multi-level inverter digital experimental system is built up on the basis of DSP and FPGA.The experimental results indicate that the multiple-carrier PWM pulse generator features outstanding expandability and commonality.