Bidirectional DC-DC converter modeling and unified controller with digital implementation

被引:74
|
作者
Zhang, Junhong [1 ]
Lai, Jih-Sheng [1 ]
Yu, Wensong [1 ]
机构
[1] Virginia Polytech Inst & State Univ, Future Energy Elect Ctr, Blacksburg, VA 24061 USA
关键词
bidirectional dc-dc converter; high-power density; digital controller; converter modeling and control;
D O I
10.1109/APEC.2008.4522963
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, a unified current controller is introduced for a bidirectional dc-dc converter which employs complementary switching between upper and lower switches. The unified current controller is to use one controller for both buck and boost modes. Such a controller may be designed with analog implementation that adopts current injection control method, which is difficult to be implemented in high power Applications due to parasitic noises. The averaged current mode is thus proposed in this paper to avoid the current sensing related issues. Additional advantage with the unified digital controller is also found in smooth mode transition between battery charging and discharging modes where conventional analog controller tends to saturate and take a long delay to get out of saturation. The unified controller has been designed based on a proposed novel third-order bidirectional charging/discharging model and implemented with a TMS320F2808 based digital controller. The complete system has been simulated and verified with a high-power hardware prototype testing.
引用
收藏
页码:1747 / 1753
页数:7
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