宽增益三电平串联谐振双向DC-DC变换器

Wide-gain Three-level Series-resonant Bidirectional DC-DC Converter

针对输入电压变化范围较宽且电压等级较高的应用背景,本文提出一种三电平串联谐振双向DC-DC变换器拓扑。新的拓扑采用三电平全桥结构和移相控制技术,通过调节移相角和三电平桥输出电压零电位占空比,用以改变输出电压。综合考虑软开关范围和谐振腔电流等因素,对系统进行建模。通过分析,给出了三电平串联谐振双向DC-DC变换器的参数设计方法。同时,在保证所有开关管均可以实现零电压开关的前提下,有效地扩宽了电压增益范围。最后,设计了一组额定功率为1.6 kW的PSIM仿真系统,验证了拓扑结构和参数设计的可行性。

In view of the application background such as wide input voltage range and high voltage level,a three-level series-resonant bidirectional DC-DC converter topology is proposed in this paper.By using a three-level full-bridge structure and the phase-shifting control technology,the novel topology adjusts the phase-shifting angle and the zero-po⁃tential duty cycles of output voltage from the three-level full-bridge in order to change the output voltage.The factors in⁃cluding soft-switching range and resonant tank current are comprehensively taken into account to model the system.Through analysis,a parameter design method for the three-level series-resonant bidirectional DC-DC converter is pre⁃sented.At the same time,the novel topology effectively extends the voltage gain range under the premise that all switch⁃ing tubes can realize zero-voltage switching(ZVS).Finally,a PSIM simulation system with rated power of 1.6 kW is de⁃signed,which verifies the feasibility of the proposed topology as well as its parameter design method.