基于STM32的微波应用器电源模块的研究与设计

发布时间：2018-01-12 11:24

本文关键词：基于STM32的微波应用器电源模块的研究与设计　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：微波应用器作为一种高效、快捷的加热装置,其体积、效率及智能化水平越来越受到人们的关注。传统微波应用器电源一般采用先工频变压器升压再倍压整流输出的工作方式,因而电源有质量重、体积大、故障多、稳定性差、功率调节难等不足。应用开关电源技术,可以改善此不足。然而,开关电源存在开关损耗,并且损耗随着开关频率和输出功率的上升而增大。因此,有了利用变压器的漏感作为LLC谐振的谐振参数实现软开关来减小开关损耗研究,而且,还有效避免了变压器漏感对电源带来的影响。但是,随着工作频率的升高,高频变压器寄生电容对电源性能的影响越来越大。本论文在分析微波应用器磁控管工作特性和软开关原理的基础上,设计了一种移相全桥LCC谐振式微波应用器电源方案并进行仿真分析和实验研究,主要工作如下:(1)采用LCC谐振变换器与移相全桥逆变电路相结合,利用变压器的漏感和分布电容作为谐振参数实现软开关,进行微波应用器电源模块的设计方案;(2)运用Fuzzy PID控制对微波电源输出电压的移相控制仿真分析,结果表明,能满足对复杂、难以建立有效模型的开关电源系统的控制性能;(3)采用基波近似法推导出了微波开关电源的数学模型,在仿真平台搭建了 LCC谐振主电路、PWM信号产生电路等模型并进行仿真验证Fuzzy PID控制效果。本论文所设计的全桥移相LCC谐振式微波应用器电源可以实现软开关,仿真和实验结果表明采用Fuzzy PID控制对微波电源输出电压的移相控制是有效可行的。
[Abstract]:Microwave application device is an efficient and fast heating device, its volume. More and more attention has been paid to the efficiency and intelligence level. The traditional microwave application power supply generally uses the mode of power frequency transformer boost and voltage doubling rectifier output, so the power supply is heavy, large volume and many faults. The switching power supply technology can be used to improve this deficiency. However, the switching power supply has switching loss, and the loss increases with the increase of switching frequency and output power. With the use of transformer leakage inductance as the resonant parameters of LLC resonance to achieve soft switching to reduce the switching loss, but also effectively avoid the transformer leakage inductance on the power supply. With the increase of operating frequency, the parasitic capacitance of high frequency transformer has more and more influence on the power supply performance. This paper analyzes the characteristics of magnetron and the principle of soft switch of microwave application device. A power supply scheme of phase-shifted full-bridge LCC resonant microwave application is designed, and the simulation analysis and experimental research are carried out. The main work is as follows: 1) using LCC resonant converter and phase-shifted full-bridge inverter. Using leakage inductance and distributed capacitance of transformer as resonant parameters, the soft switch is realized, and the design of power module of microwave application device is carried out. 2) the simulation analysis of phase shift control of microwave power output voltage using Fuzzy PID control shows that the control performance of switching power supply system, which is complex and difficult to establish an effective model, can be satisfied. (3) the mathematical model of microwave switching power supply is deduced by using the fundamental approximation method, and the LCC resonant main circuit is built on the simulation platform. PWM signal generation circuit and other models are simulated to verify the control effect of Fuzzy PID. The full bridge phase-shifted LCC resonant microwave application power supply designed in this paper can realize soft switching. The simulation and experimental results show that the Fuzzy PID control is effective and feasible for the phase shift control of the output voltage of microwave power supply.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46

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