变频-工频同步切换
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Synchronous switching between variable frequency and industrial frequency
以上为机器翻译结果，长、整句建议使用 人工翻译 。
同时利用同步切换控制实现水泵由变频电源向工频电源的平稳切换。
Moreover, synchronous switch is applied to the system in order to complete the smooth switch on condition that frequency and phase of inverter power and power supply are the same.
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