感应加热电源控制方式研究

菜单

摘要：基于感应加热电源的功率因数低，电流具有很大的谐波成分，对电网干扰严重等特点，本文针对感应加热电源控制研究方式进行讨论。本文详细介绍了感应加热电源基本原理及其发展与现状。系统的将串联谐振和并联谐振的进行了比较。相对于串联谐振逆变器,并联谐振逆变器具有电路结构简单,电源运行可靠,对负载适应性强及过流保护容易等优点。还分别清晰地列出了整流部分和逆变部分的控制方式。整流部分主要是相控整流调节。逆变部分主要分析了脉冲频率调节控制，移相控制和脉冲宽度调节控制。论文采用pspice软件对AC/DC和DC/AC部分进行了仿真，并给出了仿真结果，验证了各种控制方式的正确性，也体现出了他们的不足，有利于进一步的改进工作。55459

毕业论文关键词：感应加热电源，串联谐振，脉冲频率调节控制，脉冲宽度调节控制

Abstract: Based on the characteristics that induction heating power's low power factor and harmonic wave produced by current can impact the power grid. The basic principle of induction heating power supply and its development and present situation are introduced in this paper. And a comparison between series resonance and parallel resonance is put out in this thesis. With respect to the series resonant inverter, parallel resonant inverter has the advantages of simple circuit structure, the reliability of power supply, the advantages of strong load adaptability and over current protection is easy. Clearly separate the control method of the rectifier and inverter. Rectification is a major part of phase controlled rectifier regulator. The inverter part mainly introduces the pulse frequency control, phase control and pulse width modulation control.The simulation of AC/DC and DC/AC parts are produced by the PSPICE software, and the simulation results are given, verified the correctness of various control modes, also reflects their deficiencies, which is beneficial to the improvement of the further work.

Keywords: induction heating power, series resonance, PFM control, PDM control

1绪论 4

1.1感应加热电源基本原理 4

1.2感应加热电源的发展与现状 5

1.3本课题主要内容 6

2串联谐振式和并联谐振式逆变电源的功率控制的比较 6

2.1串联谐振式逆变电源的功率控制 7

2.2并联谐振式逆变电源的功率控制 8

2.3本章小结 8

3整流部分功率调节方案 9

4逆变部分功率调节方案 12

4.1 PFM控制 13

4.2移相控制 15

4.3 PDM控制 17

4.4本章小结 18

5总结 19

参考文献 20

1绪论

1.1感应加热电源基本原理

1831年迈克尔·法拉第发现的电磁感应是所有感应加热的基础。他提出现代感应加热的概念[1] 。依据的是初级线圈中电流的转变，能够在附近的闭合次级线圈中产生感应电流的现象。

电磁感应原理被普遍用于电动机、发电机、变压器和无线电通讯等方面，但是在这些应用中，人们认为所有的热效应都会产生有害的副作用。感应加热却是化有害为有利。交变磁场中闭合导体内产生的涡流和磁滞损失作用于金属本体时引起热效应，热效应即在极短的时间内产生大量的热能，对金属的表面或整体进行加热[2] 。以上就是感应加热的原理过程。