具有升压谐振直流环节的单相全桥软开关逆变器  

Single-phase full-bridge soft-switching inverter with a boost resonant DC link

作　　者：王强[1] 李兵 王天施[1] 刘晓琴[1] WANG Qiang;LI Bing;WANG Tian-shi;LIU Xiao-qin(College of Information and Control Engineering,Liaoning Shihua University,Fushun 113001,China)

机构地区：[1]辽宁石油化工大学信息与控制工程学院,辽宁抚顺113001

出　　处：《电机与控制学报》2020年第8期101-108,共8页Electric Machines and Control

基　　金：辽宁省教育厅科学研究经费项目(L2019017)。

摘　　要：直流母线电压在每个工作周期的短时零状态会降低谐振直流环节逆变器的直流电压利用率。为解决该问题,提出了具有升压谐振直流环节的新型单相全桥软开关逆变器。辅助电路可使直流母线电压处在更高的稳态值,降低直流母线电压归零对直流电压利用率的不利影响。依据等效电路图和理论工作波形,阐述了电路在1个工作周期的工作流程,参数设计方法和辅助电路损耗的计算方法,给出了详细的参数计算过程。实验波形证明了开关器件在切换瞬间处于软开关工作状态。关于效率和直流电压利用率的实验数据表明逆变器额定工作状态下的效率为98. 6%,而且其效率和直流电压利用率均优于同类型逆变器。因此,直流环节具有升压功能可优化谐振直流环节逆变器的效率和直流电压利用率。The short-time zero state of DC bus voltage in each working cycle reduced the DC voltage utilization of resonant DC link inverter. In order to solve the problem,a single-phase full-bridge soft-switching inverter with a boost resonant DC link is proposed. The DC bus voltage changed to zero periodically and the switches achieved soft switching. The auxiliary circuit improved the steady state value of the DC bus voltage,and reduced the negative effect of DC bus zero-voltage state on DC voltage utilization. According to the equivalent circuit diagram and theoretical working waveform,the working process of the circuit in one working cycle,the parameter design method and the calculation method of auxiliary circuit loss were described,and the detailed parameter calculation process was given. The experimental waveforms show that the switching devices are in soft-switching state at the moment of switching. The experimental data of efficiency and DC voltage utilization rate show that the efficiency of the inverter is 98. 6%under rated working condition,and its efficiency and DC voltage utilization rate are better than those of the same type of inverter. Therefore,the DC link with boost function can optimize the efficiency and DC voltage utilization of the resonant DC link inverter.

关 键 词：逆变器 直流电压利用率 软开关 谐振 开关损耗 直流环节 

分 类 号：TM464[电气工程—电器]