基于PSPICE仿真的单相交流调压系统研究与设计

发布时间：2018-03-12 21:08

本文选题：交流调压　切入点：互补控制　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：自20世纪90年代起,AC-AC斩波器一直是国内外功率变换领域内的研究热点。AC-AC斩波器是一种将一种频率幅值的交流电源变换成为另一种频率幅值的交流电源的电子设备,常应用在工业照明、电机软启动、家用电器和风机调速等领域。目前,工频AC-AC斩波器应用最为广泛,然而关于工频AC-AC斩波器的理论研究较多,实际应用策略较少,因而本文从实际应用角度出发,深入地研究了单相降压工频AC-AC斩波器,提出了一整套单相降压工频AC-AC斩波器(以下均称交流Buck变换器)的设计方法,对系统关键参数进行了详细地实验分析并说明了交流Buck变换器的未来发展方向。首先由DC-DC变换器入手,详细推导了交流Buck型变换器的基本工作原理,并分析了控制时序问题,从而验证了交流Buck型变换器的可行性。接着对变换器系统输出滤波电感、滤波电容及RCD缓冲电路等主要参数进行了理论分析,结合实际应用得出了一系列计算公式,为下面的PSPICE仿真奠定基础。PSPICE仿真主要应用于项目前期电路原理和功能性验证,本文以理论推导为基础并结合变换器实际工作要求构建了交流Buck变换器仿真电路。仿真表明了理论分析在实际应用中的局限性。通过对比波形分析结果,以负载电流和开关器件峰值电压为核心点,提出一套适用于实际应用的参数选择方法,为后期样机调试和实验分析奠定了基础。在仿真的基础上,制造了一台功率1KW的实验样机。实验结果表明,RCD缓冲电路能够有效地解决死区时间内电路续流问题,变换器输出纹波电流和输出纹波电压小,输出电压过零点处不存在电压畸变,验证了交流Buck变换器优良的工作性能。
[Abstract]:Since 1990s, AC-AC chopper has been a research hotspot in the field of power conversion at home and abroad. AC-AC chopper is an electronic device that converts AC power supply with one frequency amplitude into another AC power supply with another frequency amplitude. It is often used in the fields of industrial lighting, motor soft start, household appliances and fan speed regulation. At present, the power frequency AC-AC chopper is the most widely used. However, there are more theoretical studies on the power frequency AC-AC chopper and fewer practical application strategies. Therefore, from the point of view of practical application, the single-phase step-down power frequency AC-AC chopper is deeply studied, and a set of design methods of single-phase step-down power frequency AC-AC chopper (hereinafter referred to as AC Buck converter) are presented. The key parameters of the system are analyzed in detail and the future development direction of AC Buck converter is explained. Firstly, the basic working principle of AC Buck converter is deduced from DC-DC converter, and the control timing problem is analyzed. The feasibility of AC Buck converter is verified. Then the main parameters such as output filter inductor, filter capacitance and RCD snubber are theoretically analyzed, and a series of calculation formulas are obtained combining with practical application. To lay a foundation for the following PSPICE simulation. PSpice simulation is mainly used in the early stage of the project circuit principle and functional verification, In this paper, the simulation circuit of AC Buck converter is constructed on the basis of theoretical derivation and combined with practical requirements of converter. The simulation shows the limitation of theoretical analysis in practical application. Taking the load current and the peak voltage of the switch device as the core points, a set of parameter selection method suitable for practical application is proposed, which lays a foundation for the later prototype debugging and experimental analysis. An experimental prototype with power of 1KW is manufactured. The experimental results show that the RCD snubber circuit can effectively solve the problem of circuit continuation in dead time, and the output ripple current and output ripple voltage of the converter are small. There is no voltage distortion when the output voltage is over 00:00, which verifies the excellent performance of AC Buck converter.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46

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