AC/AC交流变换技术的种类繁多,按照有无中间直流环节，可分为交—直—交型和交—交型两大类；按照交流用电负载与输入交流电源有无电气隔离以及电气隔离元件的工作频率，AC/AC交流变换技术又可分为非隔离型、低频环节和高频环节三大类[1]。-The AC/AC exchange transformation technology type is many, whether there is according to the middle direct-current link, can divide into hands over- straight- hands over and hands over- hands over two big kinds　Uses electricity the load whether there is according to the exchange and the input alternating current supply electricity isolation as well as the electricity isolates the part the operating frequency, the AC/AC exchange transformation technology may divide into non-isolation, the low frequency link and the high frequency link three big kinds.