Devolop Igbt Induction Heating Power Base On FUZZY-PLL Complex Control

In this paper, a parallel-resonance induction heating power for equipments that used to grow laser crystal has been developed, it applies power electronics theory and adopts full-controllable electric semiconductor device IGBT. At synthesize comparison and analyze parallel-resonance and series-resonance induction heating power, whole system scheme is presented, we make the calculating in detail to all the devices in use. we design inversion control circuit with CMOS figure PLL CD4046 act as core and microprocessor 80C196KC act as assistant controller. Adopting a control method that combine Fuzzy controller and PLL control, improve induction heating power succeed in startup. Adopting electric current voltage pair closed loop feedback design, with trough route capacitance voltage and trough route electric current act as pair closed loop feedback signal , guarantee induction heating power output accuracy. And design perfect protective circuits. On the basis of these, design machining drawing of medium frequency induction heating power, and produce a prototype of a machine, debugging and testing to prototype of a machine. The results show that induction heating power using IGBT does well, frequency that ranged from 2~ 10KHz, satisfied all technology requirements that grow many kinds laser crystal.