纯正弦波输出，确保马达绝无损害；
通过开关角预置方法，叠加出了谐波含量低的稳压正弦波输出。
Using the method of firing Angle prediction, steady sinusoidal output voltage with low harmonic components can be generated.
正弦波输出，失真小，稳定性好，频率范围覆盖整个音频范围。
Sine wave output, low distortion and high stability, frequency range over with whole audio range.
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