... frequency,Ultrahigh frequency,Double frequency) it is appliying forclasses of machine parts to heat treating(quenching,anneal, temper,normalizing..., Through ... circuit adopts Siemens IGBT,MOSFET and any other new type induction heating machine. 2.Fast speed,low power consumption,small volume, ... ,over hot,etc. 3.It has the function of manual,semi-automatic,full-automatic and divide period to control, ...