分时复用控制多路输出开关电源  

Multiple Output Switching Power Supply with Time-Sharing Multiplexing Control

作　　者：李清[1] 张彼德[1] 郭筱瑛[2] 王嘉磊[1] 游芳[1] 刘威[1] 程华[3] 

机构地区：[1]西华大学电气信息学院,成都610039 [2]攀枝花学院电气信息工程学院,四川攀枝花617000 [3]中国民用航空总局第二研究所信息公司,成都610047

出　　处：《电测与仪表》2014年第20期109-115,共7页Electrical Measurement & Instrumentation

基　　金：四川省教育厅重点项目(13ZA0023)

摘　　要：针对传统的电压型PWM单反馈支路控制多路输出开关电源存在的非反馈支路调节性能差,以及输出支路之间存在交叉影响的问题,采用反激式变换器实现单输入三输出电压,同时引用电压型分时复用控制方法,从而得到稳定可靠的5V、15V、24V三个输出电压等级。详细介绍了主功率电路和控制电路的工作原理,并分析了在DCM(电流不连续模式)下反激变换器三种工作状态的交流小信号动态特性,进而建立了控制对象的开环传递函数并对其进行了仿真分析。分析可知,其低频段斜率为0dB/dec,不能实现无静差;高频段斜率为-20dB/dec,抗干扰能力差。基于此,在电压型控制回路中增加一个单极点—单零点补偿网络后,低频段斜率提高到-20dB/dec,高频段斜率提高到-40dB/dec,从而改善了系统输出性能。最后通过MATLAB软件搭建了分时复用控制多路输出开关电源的模型并进行了仿真,仿真分析可知针对此拓扑电路结构所采用的电压型分时复用控制方法能够得到稳定的、可靠的和调节性能较好的三路输出直流电压。Due to poor regulation performance of non-feedback branches and cross influence between output branches of mul-tiplexed output switching power supply controlled by traditional voltage-type PWM single-feedback branch method,the paper realizes the single-input three-output voltage based on flyback converter,and uses time-sharing voltage-type multiplexing control method to obtain stable and reliable three-level output voltage of 5V,15V and 24V. The working principle of main power circuit and control circuit is introduced in detail,and the dynamic feature of AC small signal in three working conditions of the flyback converter in discontinuous current mode（DCM）is analyzed. Furthermore,the open loop transfer function of the control plant is established,and the simulation analysis is carried out. The result shows that the slope of low frequency band is 0dB/dec and zero static error cannot be achieved;the slope of high frequency band is -20dB/dec and the robustness against disturbance is poor. Based on the result,the paper adds a single-pole single-zero compensation network in the voltage con-trol loop to increase the low frequency slope up to -（ 20dB/dec and high frequency slope up to-40dB/dec,and therefore im-proves the output performance of the system. Finally,the model of multiple output switching power supply with time-sharing multiplexing control is built using MATLAB. The simulation analysis shows that the adopted voltage-type time-sharing multi-plexing control method for the topological circuit structure in the paper can obtain stable and reliable three-output switching power supply with good regulation performance.

关 键 词：分时复用 多路输出 反激式变换器 DCM模式 

分 类 号：TM56[电气工程—电器]