變頻器的主回路拓?fù)浣Y(jié)構(gòu)如圖三所示。
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圖三變頻器主回路拓?fù)浣Y(jié)構(gòu)圖
變頻器主要由整流回路、平波回路、逆變回路以及制動回路構(gòu)成,共計需用12只電力電子器件。當(dāng)前大多使用六只電力二極管用于整流回路,六只IGBT用于流變回路。整流回路將工頻交流電變?yōu)槊}動的直流電,平波回路將脈動的直流電變?yōu)槠秸闹绷麟姡孀兓芈穼⒅绷麟娮優(yōu)樗桀l率的交流電。
對比兩個主回路可知,變頻軟起動器由于結(jié)構(gòu)簡單,使用電力電子器件數(shù)量較少,成本低于變頻器。
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