【作者】 黄硕；

【导师】 陈柏超；

【作者基本信息】 武汉大学 ， 电力电子与电力传动， 2004， 硕士

【摘要】 晶闸管中频感应电源是一种由大功率晶闸管元件组成的静止式电源，它将工频三相电源经整流、逆变转换成为中频单相交流输出，应用于感应加热。由于它具有设计简单、电效率高、使用方便等优点，因而在工业生产中得到了广泛的应用。目前生产中所使用的晶闸管中频感应电源大多采用晶闸管全控整流桥调节功率、负载为并联谐振型逆变器的结构，存在着功率因数低、起动装置繁琐、功率调节有限、控制系统复杂等缺点。本文针对以上问题，提出了一种采用不可控整流加降压斩波电路的主电路设计方案，以提高电源的输入功率因数；提出零压扫频软启动的方法以解决晶闸管中频感应电源的起动问题；采用电压、电流、阻抗三级闭环调节的控制策略，使电源保持负载匹配，恒额定功率输出：以Intel80C196MC芯片为核心，设计控制系统的软硬件。按照上述设计方案，研制了一台晶闸管中频感应电源样机，并进行了试验。试验结果表明，本文的设计方案合理可靠，达到了要求的各项技术指标，极大地提高了晶闸管中频感应电源的性能，具有较高的生产实用价值。 本文的内容主要分为六章，分别阐述了晶闸管中频感应电源的工作原理、主电路设计、控制策略、控制系统实现、试验结果和结论。第一章从整流和逆变两方面阐述了电源的工作原理，着重分析了电源的输入功率因数、逆变换流过程、零压扫频软起动方案。第二章给出了电源主电路图，并按设计要求选择功率元器件的参数。第三章分析了电压、电流、阻抗三级闭环控制系统的工作原理和过程，推导了所用的数字PI调节的算法，并通过MATLAB仿真得出调节参数。第四章以Intel80C196MC芯片为核心，分别阐述了控制系统外围电路的设计和控制软件的编写。第五章对样机试验的结果进行了详细分析，并讨论了今后工作的方向。第六章对前几章的理论分析和试验结果进行了总结，得出全文结论。更多还原

【Abstract】 The medium frequency power supply of thyristor is an equipment to heating workpiese by whirling current. It has been widely used in industrial cooking because of its simplicity, high efficiency and convenience. However, this kind of power supplies have some defects, such as harmonic, starting up, power regulating, control systems. This paper discusses a new scheme, including BUCK circuit, softly starting up with sweeping-frequency, impedance PI regulation and single chip control system, to improve the performance of power supply. A model machine has been made according to the design, and experiments have been done. The results show that the design is reasonable, reliable and useful.This paper is divided in six chapters, including the medium frequency power supply of thyristor’s theory, design, regulation strategy, control system, experiments and conclusion. The first chapter analyzed the work theory of rectifier and converter, and chiefly discussed the harmonic content of BUCK circuit and the scheme of softly starting up with sweeping-frequency. The second chapter introduced the main circuit design of this paper, and chosen the parameter of the devices in the circuit. The third chapter analyzed the theory and course of PI regulation, which inchide voltage, current and impedance. The algorithm routine has also been given, and emulated by MATLAB. The forth chapter introduced the design of control systems, which is made up of hardware and software. The fifth chapter presented the experiments that has been done on the model machine, and analyzed the results. The last chapter drew the conclusion of this paper.更多还原