Research On Control System Of Induction Heating Power Based On FPGA

Now the society is a digitized society, Digital Control System's application has become increasingly widespread. In recent years, with the emergence of FPGA technology, by virtue of its superiority in the design, its not only has been widely used in the field of communications, but also gradually been infiltrated into the area of control. Compared with MCU and DSP, because of realizing its software algorithm using hardware segment in FPGA, it has a higher processing speed. With the merits of flexible design, high integration, speed, short design cycle of FPGA, the artical has realized the frequency tracking and power control of the heating power system.This article first introduced some basic principles and the development trend of induction heating technology, and then conducted a deep research on the topology of the power. At last we determined the series resonance for the main circuit's topology, and chose the uncontrolled rectifying circuit and Buck chopper for the power regulation method.Phase-locked loop control circuit is mostly used to achieve frequency tracking in induction heating power supply. This paper analyzed the principle of the phase-locked loop, proposed a method of digital phase-locked loop (DPLL) based on FPGA in view of traditional phase-locked loop's shortcomings. In the article, the digital phase-locked loop (DPLL) hardware design method has been detailed. Secondly, we designed a closed-loop control system of power regulation. According to the features of induction heating power, power control will be transformed into the voltage control of Buck chopper. The digital power closed-loop control system has been designed, and elaborated its hardware implementation based on FPGA.Finally, induction heating power supply based on FPGA was designed, the power of which is 30kW with the frequency 10 kHz. And the driving and buffering circuits of power device were also designed, as well as other power protection circuits. Through the experiment, the results show that using the FPGA technology to realize the control system of induction heating power is feasible.