感应加热技术具有清洁、安全、高效、易控等独特优势，使其逐步取代传统加热方式，广泛应用于机械、石油化工、民用等各个领域。随着现代工业生产的复杂化和精密化发展，对感应加热电源的性能提出了更高的要求，其电路拓扑结构的改善和优良的控制技术是设备高效稳定工作的关键，且近年来数字化芯片的不断发展也为感应加热电源性能的提升创造了条件。因此，对基于数字化控制的感应加热电源的研究具有重要意义。

首先，本文分析了感应加热电源的原理及拓扑结构，对其理论基础进行深入研究。通过对比分析串联型/并联型逆变器的优缺点以及串联/并联谐振负载特性，选取并联型感应加热电源作为本课题研究对象，进一步在对比分析并联型感应加热电源调功方式的基础上，选定在直流侧通过Buck变换器调压的方式进行功率调节，从而确定系统的总体拓扑结构。

其次，对感应加热电源的功率控制环节和频率控制环节进行深入研究。在功率控制环节中，采用Buck电路电压、电流双闭环控制策略，基于状态空间平均建模法和Matlab/ Sisotool工具箱对补偿网络参数进行设计，并采用变速积分PI算法，克服了传统PI调节过程中灵活性差的缺陷。在频率控制环节中，为保证感应加热电源始终工作在谐振或准谐振状态，运用锁相环实现逆变器工作频率对谐振频率的跟踪以及电压、电流相位的锁定。在Matlab/Simulink平台搭建系统主电路及控制电路模型进行仿真验证，仿真结果表明了理论分析的正确性和控制方法的可行性。

最后，对并联型感应加热电源软硬件进行设计，搭建了以FPGA为控制核心的感应加热系统数控平台。包括主电路、驱动电路、采样保护电路、辅助电源电路等硬件电路设计，并在Quartus II开发环境中编写Verilog代码实现部分环节在线仿真，确保软件设计能够满足系统预设控制要求。基于所搭建的感应加热数控平台进行实验测试与分析，实验结果表明感应加热电源软硬件设计的正确性和控制方案的可行性。

Induction heating technology has the unique advantages of cleanliness, safety, high efficiency, and easy control. It gradually replaces traditional heating methods and is widely used in various fields such as machinery, petrochemical industry, and civil use. With the complexity and precision development of modern industrial production, higher performance is required for the performance of induction heating power supply. The improvement of its circuit topology and excellent control technology are the key to the efficient and stable operation of equipment. In recent years, the continuous development of digital chips has also created conditions for the improvement of the performance of induction heating power supply. Therefore, the research on induction heating power supply based on digital control is of great significance.

First of all, this paper deeply analyzes the principle and topological structure of the induction heating power supply, and studies the theoretical basis of the induction heating power supply. By comparing the advantages and disadvantages of series/parallel inverters and the characteristics of series/parallel resonant loads, the parallel resonant induction heating power supply is selected as the research object, and the power modulation method of the parallel induction heating power supply is further compared and analyzed. The power is regulated by the Buck converter voltage regulation method. Thus, the overall topology of the system is determined.

Secondly, the power control and frequency control of the induction heating power supply are studied. In the power control process, the buck circuit voltage and current double closed-loop control strategy is used. Based on the state space average modeling method and Matlab/ Sisotool toolbox, the compensation network parameters are designed. The variable-speed integral PI algorithm is used to overcome the inflexibility in the traditional PI adjustment process. In the frequency control section, in order to ensure that the induction heating power supply always works in a resonant or quasi-resonant state, a phase-locked loop is used to track the resonant frequency of the inverter's operating frequency and lock the voltage and current phases. The main circuit and control circuit models of the system were built on Matlab/Simulink platform for simulation verification. The simulation results show the correctness of the theoretical analysis and the feasibility of the control method.

Finally, the software and hardware of the parallel induction heating power supply are designed, and the numerical control platform of the induction heating system with FPGA as the control core is built. Including the main circuit, drive circuit, sampling protection circuit, auxiliary power circuit and other hardware circuit design, and writing Verilog code in the Quartus II development environment to realize part of the online simulation to ensure that the software design can meet the preset control requirements of system. Based on the built-up induction heating numerical control platform for experimental testing and analysis, the experimental results show that the induction heating power supply software and hardware design is correct and the control scheme is feasible.