**5. Conclusions**

A parallel dc/dc converter was proposed and investigated to achieve the main benefits of balanced input split voltages, load current sharing and reduced circulating current loss. Input split voltage balance was realized using a balance capacitor to automatically charge/discharge split capacitors in every switching cycle. The current sharing of two series full bridge circuits was achieved using a magnetic core. Passive circuits were employed on output side to decrease primary circulating current at commutated state. However, the proposed converter was out of work under power switch failure. Therefore, some bypass circuits may be added in the circuit to protect the converter from damage. This protection procedure is the next study case to further improve the circuit reliability. The theoretical analysis was well supported by the test waveforms of a prototype.

**Author Contributions:** B.-R.L. designed the project and was responsible for writing the paper.

**Funding:** This research is funded by the Ministry of Science and Technology, Taiwan, gran<sup>t</sup> number MOST 107-2221-E-224-013.

**Acknowledgments:** This research is supported by the Ministry of Science and Technology, Taiwan, under contract MOST 107-2221-E-224-013. The author would like to thank Mr. Wei-Po Liu for his help to measure the circuit waveforms in the experiment.

**Conflicts of Interest:** The author declares no potential conflict of interest.
