**4. Conclusions**

This paper proposed a three-bridge IPT system, which could realize the CC/CV mode transmission under the fixed-frequency by topology parameter design and convert from CC to CV mode by switching the working arm. On this basis, by designing the rated load resistance at the switching time, the specific output powers before and after the switching time were realized. Therefore, the effectiveness of CC/CV mode switching and the output of different powers by switching the bridge arms was verified. By establishing and analyzing the leakage inductance equivalent model based on SS topology, the resonance condition of the CC/CV mode transmission characteristics were obtained. Finally, circuit simulations and the corresponding experiment were built, which verified the theoretical analysis and the effectiveness of this structure.

**Author Contributions:** Conceptualization, M.L. and J.L.; data curation, Y.S. and M.L.; project administration, X.D. and B.L.; resources, G.Z.; supervision, G.Z.; validation, X.D.; writing—review and editing, Y.S. and J.L.

**Funding:** This research was funded by National Natural Science Foundation of China grand number 51777146 and the Science and Technology Foundation of Guizhou province in China (No. LH-[2014]7369)

**Conflicts of Interest:** The authors declare no conflict of interest.
