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A Digitally Controlled Low-EMI SPWM Generation Method for Inverter Applications

机译：用于逆变器应用的数控低EMI SPWM生成方法

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摘要

This paper presents a digitally controlled way of generating the sinusoidal signal with less memory consumption. Moreover, this paper also presents a new switching frequency modulation technique. This technique utilizes the concept of spread spectrum frequency modulation that is used to suppress the electromagnetic interference (EMI) caused by high switching frequencies. Measurement results at the output sine pulse-width generation show that when the spread spectrum technique was applied to the conventional triangular wave and the fundamental, second, and third harmonics of switching frequency were reduced, respectively, by 12.8, 11.2, and 16.4 dB trading off with the slight increase in total harmonic distortion (THD) of 0.092% from a THD of 2.34%. While in the inverter output, there was a 14-dB reduction in EMI peak in exchange to 0.12% increase in THD from a THD of 2.57%.
机译：本文提出了一种以较少的内存消耗生成正弦信号的数字控制方式。此外，本文还提出了一种新的开关频率调制技术。该技术利用了扩频频率调制的概念，该概念用于抑制由高开关频率引起的电磁干扰（EMI）。输出正弦脉冲宽度生成的测量结果表明，当将扩频技术应用于常规三角波时，开关频率的基波，二次谐波和三次谐波分别降低了12.8、11.2和16.4 dB的交易总谐波失真（THD）从2.34％的总谐波失真（THD）略微增加了0.092％。在逆变器输出中，EMI峰值降低了14 dB，而总谐波失真（THD）由2.57％降低为0.12％。

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