基于分离补偿网络的IPT系统功率扩容策略

Power expansion strategy of IPT system based on separated compensation network

将感应电能传输(IPT)系统的补偿网络分离并加入各并联逆变器中,用以解决功率扩容和环流问题.分析采用单逆变器拓扑和功率扩容拓扑的IPT系统数学模型.设计各并联逆变器的补偿网络参数,推导功率扩容系统的功率与效率表达式.分析各并联逆变器在驱动不同步时的环流回路,给出零电压开关(ZVS)控制策略.搭建1.2 kW基于分离补偿网络的IPT系统功率扩容装置,进行实验验证.实验结果表明,各并联逆变器的输出功率比约为1∶2,均实现了ZVS,功率扩容系统直流到直流的整体传输效率为92.53%,环流幅值为0.2 A,证明了所提功率扩容拓扑的实用性和有效性.

The compensation network of the inductive power transfer(IPT)system was separated and added to each parallel inverter to solve the power expansion and circulating current problems.Firstly,the mathematical models of the IPT system with single-inverter topology and power expansion topology were analyzed.Secondly,the compensation network parameters of each parallel inverter were designed,and the power and efficiency expressions of the power expansion system were also derived.Then,the circulating current of each parallel inverter was analyzed when the drives were asynchronous,and the zero-voltage-switch(ZVS)control strategy was given.Finally,a 1.2 kW IPT system power expansion device based on the separation compensation network was built for experimental verification.Experimental results showed that the ratio of the output power of each parallel inverter was about 1∶2and all of them achieve ZVS operation,and the overall transmission efficiency from DC to DC of the power expansion system was 92.53%while the amplitude of the circulating current was 0.2 A,which proved the practicality and effectiveness of the proposed power expansion topology.