| It's a difficult work for designer concerning light-load efficiency of bidirectional DC-DC converter. This paper presents comprehensive analysis and research towards the power loss of interleaving topology circuit on bidirectional DC-DC converter in order to reduce power losses and improve efficiency at light load. With four-phase Buck+Boost interleaving bidirectional DC-DC converter operating in Buck mode as a model, the paper take various strategies to raise efficiency of light load step by step. First of all, the paper analyzes the cutting phase strategy, which is a kind of method is simple and saving cost. Meanwhile, it gives the design criteria that two-phase Buck+Boost interleaving bidirectional DC-DC converter adjusts working frequency, thus minimizes the power loss under different loads. Finally, the paper discusses the light load conditions the stability performance and dynamic performance of the bidirectional Buck +Boost converter, and conduct the small signal model of CCM and DCM modes. Because of this article is based on TMS320F2812 DSP chip to control the bidirectional DC-DC converter, therefore, the use of MATLAB simulation software for light load cases of the bidirectional DC-DC converter digital compensator simulation analysis and design. Through the experimental results verify the validity of the theoretical analysis, which provides theory basis to improve the efficiency of the light load for multiphase interleaving bidirectional DC-DC converter. |
PDF Full Text Request