【摘要】 为了解决应用于电动汽车与电网进行双向互动的双向DC/DC变换器的设计问题,对该变换器的应用环境特点、负载特性、双向有源桥和谐振式CLLC的特性等进行了研究。通过对实际应用场景和负载特点的分析,归纳出了应用在此类环境下的双向DC/DC变换器应该选择能够在较宽增益变化范围内实现软开关的拓扑;通过结合实际应用场景,对比了双向有源桥和谐振式CLLC拓扑,选择了谐振式CLLC作为该变换器的基本拓扑;给出了基于谐振式CLLC拓扑的双向DC/DC变换器的设计流程及关键参数的计算公式;基于谐振式CLLC拓扑和流程设计了一台3 k W的双向DC/DC变换器。研究结果表明:以Si MOSFET为开关器件,当开关频率在100 k Hz以上时,变换器的正反向效率可以达到96.6%。更多还原

【Abstract】 In order to solve the design problem of the bidirectional DC/DC converter applied for the two-way interaction between electric cars and power grids,a full research aiming at the characters of the application,load and the characters of the dual active bridge and resonant CLLC topology was conducted. According to the research about the application environment and the load,a topology achieving soft switching in wide gain range should be chosen for the bidirectional DC/DC converter used for this application. Two topologies,dual active bridge and resonant CLLC,were compared based on the application environment,and the better one,resonant CLLC topology was chosen. Design guideline and key calculation formula were given for the resonant CLLC topology. A 3 k W bidirectional DC/DC prototype based on the resonant CLLC topology applied for V2 G was designed based on the design guideline. Experimental results indicate that the efficiency of this converter based on Si MOSFETs achieved 96. 6% in both forward mode and backward mode,when the switch frequency above 100 k Hz.更多还原