介质阻挡放电电源的多参数控制方法研究

发布时间：2018-05-25 10:10

本文选题：介质阻挡放电 + 脉宽调制　；参考：《合肥工业大学》2017年硕士论文

【摘要】：等离子体是物质的第四态,其应用前景非常广泛,目前,研究较多的是在大气压下利用介质阻挡放电产生等离子体。介质阻挡放电的产生需要高压交流电源供电,而放电效果与电源的电压、频率和波形有关。相对来说,电压和频率越高,放电效果越好,同时负载的谐振频率对电源的运行效率也有一定的影响。根据这两个特点,结合介质阻挡放电的负载特性,研制出一种电压可调,频率可自动跟踪放电频率的电源,使得电源运行时的有功功率达到最大。本论文重点研究介质阻挡放电(DBD)电源的多参数控制方法,使得DBD电源参数始终处于最优控制状态。论文主要包括以下几个方面:(1)电源逆变电路拓扑结构设计。根据介质阻挡放电发生器容性负载的特性,利用补偿电感的方法构成谐振电路。通过对串并联谐振电路的分析和比较,最终选择串联谐振电路作为介质阻挡放电的主电路结构。(2)控制电路的设计。根据所选择的串联谐振主电路结构,采用了PWM脉宽调制控制方式,实现输出电压的可调。考虑到负载谐振频率会因外界而改变,设计了基于锁相环CD4046的频率跟踪电路,提高整个电源的效率。(3)电源电路设计。电源系统主要包括:输入整流滤波电路、逆变电路、控制电路、驱动电路、频率跟踪电路、保护电路、辅助电源等。(4)电源结果分析。对实际电路进行实验,验证输出电压的可调和频率自动跟踪可以实现。并将电源应用于介质阻挡放电发生器,采集重要节点的波形,验证负载对频率的影响。
[Abstract]:Plasma is the fourth state of matter, and its application prospect is very extensive. At present, more researches are focused on the generation of plasma by dielectric barrier discharge (DBD) at atmospheric pressure. The generation of dielectric barrier discharge requires high voltage AC power supply, and the discharge effect depends on the voltage, frequency and waveform of the power supply. On the other hand, the higher the voltage and frequency, the better the discharge effect, and the resonant frequency of the load has a certain effect on the efficiency of the power supply. According to these two characteristics and combined with the load characteristics of dielectric barrier discharge, a kind of power supply with adjustable voltage and frequency can automatically track the discharge frequency is developed. This paper focuses on the multi-parameter control method of dielectric barrier discharge (DBD) power supply, which makes the parameters of DBD power always in the optimal control state. This paper mainly includes the following aspects: 1) the topology design of power inverter circuit. According to the capacitive load characteristics of dielectric barrier discharge generator, the resonant circuit is constructed by compensating inductance. Through the analysis and comparison of series-parallel resonant circuit, the series resonant circuit is chosen as the main circuit structure of dielectric barrier discharge. According to the selected series resonant main circuit structure, the PWM pulse width modulation control mode is adopted to realize the adjustable output voltage. Considering that the resonant frequency of the load will change with the outside world, a frequency tracking circuit based on phase-locked loop (CD4046) is designed to improve the efficiency of the whole power supply. The power supply system mainly includes: input rectifier filter circuit, inverter circuit, control circuit, drive circuit, frequency tracking circuit, protection circuit, auxiliary power supply. The experimental results show that the harmonic frequency tracking of output voltage can be realized automatically. The power supply is applied to the dielectric barrier discharge generator to collect the waveforms of important nodes to verify the influence of load on the frequency.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O461.2;TN86

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