脉宽调制两种采样方法的比较分析

On the Comparison of Two Puls-modulated Sampling Methods

对脉宽调制两种采样方法——自然采样法和规则采样法下的逆变器输出波形进行了比较分析。详细推导了两种采样方法下,采样时刻及输出电压的数学表达式。计算了不同载波比及调制比情况下的电压谐波含量,并指出了两种采样法下的谐波含量及误差与有关参数的关系。并为削弱谐波提出了一些可采取的措施。

The out - voltage waves by DC - AC inverter under two kinds of pulse - modulated sampling methods -the naturally sampling method and the regularly sampling method,have been comparatively studied.The mathematic expressions on the sampling time points and the out - voltages are amply developed respectively, and the voltage harmonics are calculated by it when the different carrier ratios and modulating ratios are given. At the same time, the relationship between the harmonics or the concerned errors and the some parameters is clarified. Finally, some measures for at-tenusting harmonics are also proposed in the article.