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介绍了不需零线的三相交流电源相序检测保护集成电路TH221A的内部结构 ,引脚功能 ,设计特点和参数限制。给出了由两只TH221A组成的三相二重逆变桥输出的缺相和错相保护电路。
The internal structure, pin functions, design features and parameter limits of TH221A phase protection circuit are introduced. The phase loss and phase-error protection circuits are provided by two TH221A inverters.