CAJ | 학술논문

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5 V、15 V、24 V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。
침대전통적전압형PWM단반궤지로공제다로수출개관전원존재적비반궤지로조절성능차，이급수출지로지간존재교차영향적문제，채용반격식변환기실현단수입삼수출전압，동시인용전압형분시복용공제방법，종이득도은정가고적5 V、15 V、24 V삼개수출전압등급。상세개소료주공솔전로화공제전로적공작원리，병분석료재DCM（전류불련속모식）하반격변환기삼충공작상태적교류소신호동태특성，진이건립료공제대상적개배전체함수병대기진행료방진분석。분석가지，기저빈단사솔위0dB/dec，불능실현무정차；고빈단사솔위-20dB/dec，항간우능력차。기우차，재전압형공제회로중증가일개단겁점-단영점보상망락후，저빈단사솔제고도-20dB/dec，고빈단사솔제고도-40dB/dec，종이개선료계통수출성능。최후통과MATLAB연건탑건료분시복용공제다로수출개관전원적모형병진행료방진，방진분석가지침대차탁복전로결구소채용적전압형분시복용공제방법능구득도은정적、가고적화조절성능교호적삼로수출직류전압。
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.