FPGA-based induction heating with variable modulus control all-digital Phase-Locked Loop research

This paper presents a field-programmable gate array (FPGA) implementation of an all-digital Phase-Locked Loop with alterable modulus control that used for induction heating power supply frequency tracking. The design is developed using a hardware description language (Verilog HDL), and by expanding PLL center frequency band and the use of variable-mode control for fast tracking. It´s very simple while maintaining good accuracy and speed. Through the typical frequency band computer simulation experiments confirmed that the design has a wide range of phase-lock ability and a fast frequency tracking performance to meet the load frequency induction heating power tracking requirements.