摘要
在传统的电力动车组车载隔离型单相逆变器中,为逆变电路提供直流输入的隔离型升压DC/DC变换器采用的是脉冲宽度调制(PWM)的移相全桥变换器,存在开关损耗大、转换效率低的缺点。针对上述问题,提出了在车载单相逆变器DC/DC升压电源中采用全桥LLC谐振软开关技术的方法。首先,对全桥LLC变换器进行建模,分析其工作原理和参数设计方法;其次,通过Matlab/Simuink仿真验证了理论参数的可行性;最后,按照设计参数制作了1台2.5 kW的采用脉冲频率调制(PFM)的全桥LLC谐振变换器的实验样机。实验结果表明,样机额定输入电压为DC110 V,LLC谐振变换器的输出电压可恒定保持在DC400 V,可以为后级的逆变电路提供稳定的直流输入,开关管在全负载范围内实现了零电压导通(ZVS),有效提高了隔离型升压电源的效率。
In the traditional on-board isolated single-phase inverter of electric multiple units,the isolated booster DC/DC converter that provides DC input for the inverter circuit uses a pulse-width modulation(PWM)phase-shifted full-bridge converter.It has the disadvantages such as large switching loss and low conversion efficiency.In view of the above problems,a method of adopting full-bridge LLC resonant soft switching technology in a DC/DC boost power supply of a vehicle single-phase inverter was proposed.First,the full-bridge LLC converter was modeled,and its working principle and parameter design method were analyzed;the feasibility of theoretical parameters was verified by Matlab/Simuink simulation;finally,a 2.5 kW pulse frequency modulation was produced according to the design parameters(PFM)’s full-bridge LLC resonant converter experimental prototype.The experimental results show that the rated input voltage of the prototype is DC110 V,the output voltage of the LLC resonant converter can be kept constant at DC400 V,which can provide a stable DC input for the inverter circuit of the subsequent stage and realize Pass(ZVS)in full-loaded scope,which effectively improves the efficiency of isolated booster power supply.
作者
袁路涛
王硕禾
张冰华
Yuan Lutao;Wang Shuohe;Zhang Binghua(School of Electrical and Electronic Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)
出处
《石家庄铁道大学学报(自然科学版)》
2021年第2期93-98,126,共7页
Journal of Shijiazhuang Tiedao University(Natural Science Edition)
基金
天津市科技计划项目(19YFZGQY00040)
石家庄市科技服务能力提升计划项目(209060561A)。