Heating principle of intermediate frequency induction furnace and some factors affecting its power factor are discussed, Some betterments that parallel connection spacer circuit is replaced by interfusion connection spacer circuit are put in practice.

• 摘要对中频感应炉的加热原理以及其功率因数的影响因数进行了探讨，并将不能恒功率输出的并联逆变电路改进为混联逆变电路。