Research Of Intelligent Control Method Of Induction Heating Power

Compared to the traditional heating methods, induction heating has many advantages. As a highly efficient equipment, induction heating power is widely used in industrial automation and home electric field in recent years. At present, most of the induction heating power control systems are using PID controllers, which are based on the precise mathematical model. Induction heating load is a time-varying system, which contains nonlinear structure and time delay, the traditional PID control can not solve these problems, so we select adaptive control scheme to control the induction heating system.Firstly, this paper introduces the basic knowledge of induction heating power, with the series resonant induction heating power as the research object, analyses its working principle, load characteristics and ways of power adjustmengt. This paper proposes a general inverter control technology - asymmetric voltage control(AVC), and analyses the optimal control strategy when it achieves soft switching.Then, based on the analysis of the traditional control methods, the paper introduces the concept of adaptive control, and chooses a model reference adaptive control (MRAC) theory as the realization of this issue. Field programmable gate array (FPGA) has the characteristics of run faster, more internal resources and strong capability of processing, which conforms to the trend of intelligent induction heating power supply, and compared with the realization of the software, it has greatly improve the speed of the implementation, so in this paper model reference adaptive controller is designed with FPGA .Based on the overall the design process, each module is described in detail with simulation.The applications of adaptive control and virtual instruments are widely used, but the application of combining the two does not have much. In order to improve the performance of the virtual instrument control system, this paper combines virtual instruments and adaptive control by LabVIEW to and build model reference adaptive control system for induction heating power supply, which shortens the design cycle, and improves the performance and effectiveness of control system.