摘要
四开关Buck-Boost FSBB(four-switch Buck-Boost)变换器电路工作在Buck和Boost两种工作模式时可以获得更高的工作效率,但是在2种模式之间相互切换时,就会出现影响变换器性能的盲区。通过分析四开关变换器输入输出电压的转换比和开关管占空比之间的关系,从而推导出盲区产生的原因,并对传统的两模式控制策略加以改进,提出了一种电压控制带补偿的四模式控制策略,使开关管在全部工作电压范围内均可工作于有效占空比区间,从而消除盲区的影响。通过环路补偿网络设计,提高变换器的性能,减小了输入电压、负载等扰动的影响,实现了整个系统的稳定、高效运行。仿真及实验验证了控制策略正确且可行。
The four-switch Buck-Boost(FSBB) converter circuit can achieve a higher operating efficiency in both the Buck and Boost modes. However, when it switches between these two modes, a blind area affecting the performance of the converter will appear. By analyzing the relationship between the conversion ratio of input to output voltage and the duty ratio of the switching tube, the cause of blind area is deduced. Moreover, a four-mode control strategy of voltage control with compensation is proposed to improve the traditional two-mode control strategy, so that the switch tube can work at the effective duty cycle interval within the whole voltage range, thus eliminating the influence of blind area.Then, the control loop is improved by compensation to improve the performance of the converter and reduce the influence of voltage, load and other disturbances, thereby realizing the stable and efficient operation of the whole system. Finally,simulation and experimental results verified the correctness and feasibility of the proposed control strategy.
作者
曹以龙
吴丹
朱冬冬
江友华
杨兴武
CAO Yilong;WU Dan;ZHU Dongdong;JIANG Youhua;YANG Xingwu(School of Electronics and Information Engineering,Shanghai University of Electric Power,Shanghai 200090,China;School of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《电源学报》
CSCD
北大核心
2022年第5期111-118,共8页
Journal of Power Supply
基金
上海市科技创新行动计划资助项目(19DZ1205402)。
