PLL Design and Performance Analysis of 1 MHz Parallel-resonant Inverter

This paper presents a practical phase-locked loop circuit design method of solid-state MHz-class induction heating power.The lock time,pull-in time and the stability of system performance are verified,and the parallel-resonant inverter is controlled by this circuit,which makes the power MOSFET achieve zero-current zero-voltage switch.The operating frequency of inverter follows the inherent resonant frequency of the system,and the power will be able to run on the state of the quasi-resonant whose load power factor is close to 1.