【作者】 罗松涛；

【导师】 彭侠夫；

【作者基本信息】 厦门大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 减小电力电子装置尤其是传统的AC/DC整流器对电网的谐波污染,提高装置的功率因数,日益受到国内外学者的密切关注。伴随着数字控制技术的不断发展,越来越多的PFC控制策略通过数字信号处理器(DSP)得以实现。数字化控制电源已成为当今开关电源产品设计的潮流。本文在平均电流模式控制的有源功率因数校正技术的基础上,设计了一种主电路采用新型半桥变换器拓扑结构,控制电路基于数字信号处理器(DSP)的单相功率因数校正器。论文首先对新型单相半桥PFC电路的工作原理进行了系统的分析,对电路的小信号数学模型进行了研究,建立了系统的简化平均小信号数学模型。本文中控制策略采用电流环和电压环双闭环控制结构,控制算法采用传统的PI算法。在系统的简化平均小信号数学模型的基础上,本文详细研究了双闭环系统中PI调节器的设计方法,给出了控制系统主要的硬件设计、部分软件设计以及程序流程图。最后,本文采用TI公司生产的TMS320LF2407A型号的DSP作为主控芯片,设计完成了一套平均电流控制的PFC数字化实验装置。最终使得整个系统具有输入功率因数接近于1,低电流纹波以及输出电压稳定的特性。实验结果证实了理论分析的正确性和控制方案的可行性,取得了预期的效果。更多还原

【Abstract】 Reducing harmonic pollution especially conventional AC/DC rectifier generated and improving the power factor are hotspot in power electronics fields. With the development of digital technique ,more and more PFC control algorithms can be implemented in power electronics by the digital signal processors(DSP).Nowadays it is popular to use digital control in power supply design.Based on active power factor correction(APFC)of average current mode control,the paper introduce the design and implementation of a fully digital controlled single-phase novel half-bridge power factor corrector. The control method is realized using digital signal processor(DSP).At first,the basic working principle of novel single-phase half-bridge is studied. The paper research small signal model of PFC circuit and build the simplified average small signal model of the system. The double closeloop framework is applied in the PFC control circuit and the PI algorithm is adopted. Based on simplified average small signal model,the paper develop design method of PI regulators which are applied in double closeloop system. The hardware design and software design are presented.Furthermore,the main program flow chart are given.At last, A power factor correction test system is introduced based on TMS320LF2407A.The whole system can achieve close to unity power factor, lower current harmonics and constant output voltage. Experimental results indicate the feasibility of control scheme and the validity of theory analysis. Anticipation is realized.更多还原