改进型脉冲密度调功换流控制方法  

Improved Pulse Density Modulation Power Conversion Control Method

作　　者：宗晓萍[1] 柴艳鹏 王培光[1] 胡雪芳 ZONG Xiao-ping;CHAI Yan-peng;WANG Pei-guang;HU Xue-fang(Hebei University,Baoding 071002,China)

机构地区：[1]河北大学,电子信息工程学院,河北保定071002

出　　处：《电力电子技术》2020年第11期51-53,共3页Power Electronics

基　　金：国家自然科学基金(11771115)。

摘　　要：串联谐振逆变器脉冲密度调制(PDM)调功可在全功率范围内实现功率器件零电压开关(ZVS)或零电流开关(ZCS),但是在逆变脉冲被封锁的工作周期,感性角度内逆变电流续流会产生输出电压尖峰。提出了一种改进型PDM调功换流控制方法,通过调整逆变脉冲的触发时序,避免了输出电压尖峰的产生,同时实现了不同桥臂功率器件的损耗一致。搭建了Matlab/Simulink仿真模型,并使用FPGA芯片作为主控制器,设计了一台50 kW串联谐振逆变电源样机,仿真和实验验证了上述控制方法的有效性。Pulse density modulation(PDM)power modulation of series resonant inverter can realize the power device zero voltage switch(ZVS)or zero current switch(ZCS)in the full output power range,but the current freewheeling of the inverter within the inductive angle will cause the output spike voltage during the operation period when the pulse of inverter is blocked.An improved PDM power converter control method is proposed.In order to avoid the peak of output voltage,the trigger sequence of inverter pulse is adjusted so that the loss of power devices of different bridge arms is equal.The simulation model of Matlab/Simulink is built,and FPGA chip is used as the main controller.A 50 kW series resonant inverter is designed.Simulation and experiment verify the effectiveness of the above control method.

关 键 词：串联谐振逆变器 脉冲密度调制 换流控制 

分 类 号：TM464[电气工程—电器]