基于超级电容的宽输入范围DC/DC变换器设计

Design DC/DC Converter with Wide Input Voltage Range for Supercapacitor

针对输入电压波动导致大功率超级电容充电装置输出范围窄、控制精度不高的问题,研究了一种基于超级电容的宽输入范围DC/DC变换器。该变换器采用Buck-移相全桥变换器的两级变换,同时具备宽电压调节范围和负载移相全桥变换器软开关的特点。通过分析超级电容的等效电路模型,对直流母线电压控制提出了基于功率环的电压电流双环控制方法,可以快速跟随输入电压变化,保持母线电流平稳,并在Matlab/Simulink平台上搭建仿真模型进行分析。最后,通过在白俄罗斯明斯克公交系统300 kW充电桩上的应用,验证了该设计的可行性。

To solve such defects as low control accuracy and narrow output voltage range of high-capacity charging device for supercapacitor caused by voltage fluctuation,a supercapacitor based DC/DC converter with wide input range was researched.Utilizing two-stage conversion of buck-phase shift full bridge(Buck-PSFB)the converter possessed both features of wide voltage regulation range and soft-switch of load phaseshifting full-bridge converter at same time.By means of analyzing the equivalent circuit model of supercapacitor,a power loop based voltage-current double loop control method to control DC bus voltage and current,which could follow the variation of input voltage variation rapidly and hold the bus current steady,was proposed.In view of the above,a simulation model was constructed on Matlab/Simulink platform for the analysis.Finally,the feasibility of the proposed control method is verified by applying it to 300kW bus charging pile of public traffic system in Minsk,Belarus.