摘要
对于汽车低压辅助电源系统,双电源(48 V/12 V)系统架构已经成为12 V供电系统到48 V供电系统的过渡方案。为提高效率及实现电池组自动均压,研究了低压大电流的双向隔离DC-DC变换器拓扑及其控制方法。首先,提出了一种混合供电系统的架构,可以减小DC-DC变换器的功率容量以及电池组的数量;其次,结合所研究的架构,提出了LLC-DCX(DC-transformer)变换器的同开同关调制策略;再次,在传统LLC变换器中添加钳位二极管限制启动电流,并在过载情况下实现恒功率限制。最后,通过纯模拟控制,采用一台720 W(12 V/60 A)的LLC变换器样机,对变换器的调制策略、功率分配以及电池均压等特性进行验证,其结果表明了所提出方案的有效性。
The dual-power supply(48 V/12 V)system architecture has become a solution for the transition from a 12 V to a 48 V power supply system used in an automotive low-voltage auxiliary power supply system.To improve the efficiency and realize automatic voltage equalization of battery packs,the topology of a bidirectional isolated DC-DC converter with low output voltage and large output current and its control method are studied.Firstly,to reduce the power capacity of the DC-DC converter and the number of battery packs,a hybrid power supply architecture is proposed.Secondly,with the combination of the novel architecture,a synchronized turn-on and turn-off modulation strategy is proposed,which can achieve constant voltage gain of LLC-DCX converters.Thirdly,clamping diodes are added to the conventional LLC converters to limit the inrush current during start-up.In addition,constant power limitation is achieved under the over-load condition.Finally,experiments based on a 720 W(output of 12 V/60 A)LLC converter prototype were conducted th-rough pure analog control to verify the modulation strategy,power distribution and characteristics such as battery voltage equalization,which demonstrates the effectiveness of the proposed solution.
作者
粟梅
蔡志强
谢诗铭
许国
邓国良
陈孝莺
SU Mei;CAI Zhiqiang;XIE Shiming;XU Guo;DENG Guoliang;CHEN Xiaoying(School of Automation,Central South University,Changsha 410083,China)
出处
《电源学报》
CSCD
北大核心
2020年第3期22-30,共9页
Journal of Power Supply
基金
中南大学创新驱动计划资助项目(2019CX003)
电力电子装备与电力电子化电力网络湖南省重点实验室资助项目(2018TP1001)
长株潭国家自主创新示范区重大标志性资助项目(2018XK2002)
青年科学基金资助项目(51907206)。
关键词
双向隔离DC-DC变换器
汽车双电源系统
电池均压
恒功率限制
恒电压增益
bidirectional isolated DC-DC converter
automotive dual-power system
battery voltage equalization
co-nstant power limitation
constant voltage gain
