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请教下关于全桥逆变的一些问题。



我在做全桥逆变    09年的全国电子设计大赛题目   光伏并网,我想问的是我给固定的占空比,输出就是正弦波了,不是要输入SPWM波才是正弦波吗,还有改变什么才能改变输出正弦波的相位与频率。