Improve Performance of High-gain Floating Double Series-capacitor Converter with Common Ground and Low-side Gate Driving

This paper proposes a method to modify a four-phase double series-capacitor (4P-FDSC) converter. The proposed converter not only inherits all merits of the original converter but also achieves common ground and low-side gate driving for all switches. Only one inductor (L
p
) and one capacitor (C
o
) are added, but the extra capacitor helps the output voltage is more stable. And two inductors can couple so that the magnetic volume does not increase. This technique includes several simple modification steps and can be applied to other structures. It is explained step-by-step on the 4P-FDSC converter. A 1.6-kW prototype of the proposed converter was built and tested to verify the performance of the suggested method.