消除交叉耦合的三相感应式电能传输系统

传统的三相感应式电能传输系统的磁耦合机构存在严重的交叉耦合，影响系统效率。为了消除原副边线圈之间的交叉耦合，文中分析了三相串—串拓扑电路，利用DDQ结构线圈解耦的原理，在DDQ型线圈上增加一个与原DD线圈成90°放置的DD型线圈，使不同线圈间互感均为零，由此提出并设计了一种消除交叉耦合的三相感应式电能传输系统磁耦合机构。最后，搭建了一个3.3 kW的原理样机进行验证。实验表明，所设计的三相耦合机构的交叉耦合可以忽略，最高效率(直流—直流)可达95.61%，当系统偏移15%的情况下，内部的解耦被严重破坏时，系统效率发生下降，最大降低2.16%。实验结果表明该结构有效且可行，可适用于三相大功率传输。

Three-phase Inductive Power Transfer System with Cross-coupling Elimination

The coupling structures of conventional three-phase inductive power transfer(IPT)systems have serious cross-coupling, which affects the efficiency of the system. In order to eliminate the cross-coupling between the primary and secondary coils, the series-series topology is analyzed. Based on the decoupling principle of the DDQ pad, another DD coil, which forms a 90° angle with original DD coil of the DDQ pad, is placed above the DDQ pad so that the mutual inductance between the different coils is zero. Thus, a magnetic coupling structure for the three-phase IPT system is proposed. Finally, a 3. 3 kW prototype is set up to verify the analysis. Experimental results show that the cross-coupling of the designed three-phase coupling structure is small and negligible. The maximum efficiency(DC-DC)of the system is up to 95. 61%. When the system offsets by 15% and the internal decoupling is severely damaged, the system efficiency is reduced and the maximum reduction is 2. 16%. The results indicate that the proposed approach is effective and can be applied to high power transfer.