Conference Proceeding

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

Future Energy Electron. Center, Virginia Polytech. Inst. & State Univ., Blacksburg, VA
03/2008; DOI:10.1109/APEC.2008.4522963 pp.1747 - 1753 In proceeding of: Applied Power Electronics Conference and Exposition, 2008. APEC 2008. Twenty-Third Annual IEEE
Source: IEEE Xplore

ABSTRACT 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.

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Keywords

Additional advantage
 
adopts current injection control method
 
averaged current mode
 
bidirectional dc-dc converter
 
complete system
 
conventional analog controller
 
digital controller
 
discharging modes
 
high-power hardware prototype testing
 
modes
 
power applications
 
proposed novel third- order bidirectional charging/discharging model
 
smooth mode transition
 
unified controller
 
unified current controller
 
unified digital controller
 
upper
 

Junhong Zhang