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在详细分析二次谐波正、反相交替注入抵消原理基础上，探讨了多种结构的无源单相低谐波整流装置方案，这些方案能大幅度降低交流电源谐波含量THD，而且结构简便，特别适合于工业旧设备的改造。
Based on the detailed analysis of the principle of alternating and negative injection of the second harmonic, the scheme of passive single-phase and low-harmonic rectifier with different structures is discussed. These schemes can greatly reduce the harmonic content THD of AC power supply, Simple, especially suitable for industrial transformation of old equipment.