集成功率解耦电路的PFC AC/DC变换器  

PFC AC/DC converter integrated with power decoupling circuit

作　　者：曾燊杰 李红梅[1] 张恒果 崔超[1] Zeng Shenjie;Li Hongmei;Zhang Hengguo;Cui Chao(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009

出　　处：《电子技术应用》2018年第12期143-146,共4页Application of Electronic Technique

摘　　要：电动汽车车载充电器前级PFC AC/DC变换器多采用大容量电解电容抑制直流母线输出电压纹波的方式,电解电容寿命短、易受温度影响等自身因素会降低充电机整体的使用周期和可靠性,甚至产生炸机故障。为此,提出采用PFC AC/DC变换器输出侧并联功率解耦电路的方式,大幅减小直流母线处并联的滤波电容容量,为使用性能优良的薄膜电容予以替代电解电容提供可能,旨在使PFC AC/DC变换器在减小直流母线输出电压纹波的同时实现充电机的安全可靠运行。为此,基于功率解耦电路工作状态的详细分析,建立功率解耦电路的数学模型,设计改进型比例谐振(Proportional Resonant,PR)控制器实施控制;此外,为了提升系统的控制性能及鲁棒性,对于PFC AC/DC变换器实施无模型非线性功率控制。在上述研究工作的基础上,制作700 W的实验样机,基于dSPACE 1007平台搭建实验样机测试系统,验证集成功率解耦电路的PFC AC/DC变换器一体化解决方案的可行性与有效性。The bulky electrolytic capacitor is conventionally used to curb the output voltage ripple of output DC-link in the front-end PFC AC/DC converter,which is applied for the on-board charger of the electrical vehicle.Due to the drawbacks of electrolytic capacitor,such as the short lifetime,susceptibility to temperature and other reasons,the reliability and usage cycle of on-board charger are reduced,even leading to the system breakdown.In order to decline the output voltage ripple in the output DC-link,the PFC AC/DC converter paralleled with power decoupling circuit at the output side is proposed,ensuring safe and reliable operation in the on-board charger.It contributes to diminish the volume of output filtering capacitor sharply and utilize the excellent film capacitor instead of the electrolytic capacitor.In this paper,the mathematical model of power decoupling circuit is established based on the detailed analysis of the circuit operation.Besides,the improved PR(Proportional Resonant)controller is designed to dominate the power decoupling circuit.In order to improve the control performance and robustness,the model-free nonlinear power control strategy is implemented to the PFC AC/DC converter.Based on the aforementioned researches,a700W experiment prototype is developed.The feasibility and efficiency of the proposed method are validated by the DSPACE1007test platform.

关 键 词：PFC AC/DC变换器 二倍频脉动功率 功率解耦 无模型非线性功率控制 

分 类 号：TM461[电气工程—电器]