Syntheses of Three-Port DC–DC Converters

This article proposes a systematic method to construct three-port converters (TPCs) and bidirectional three-port converters (BTPCs) by integrating two dc–dc converters including nonisolated and isolated types. By adding extra one power switch and one diode, the TPCs can be constructed by the dc–dc converters. A series of the proposed TPCs can provide independent power flow control of single-input to single-output, single-input to dual-output, and dual-input to single-output. By adding extra two power switches, the BTPCs can be constructed by the dc–dc converters. The power flows between any two ports can be controlled bidirectionally without significantly altering their architecture. Finally, a typical nonisolated BTPC is analyzed and implemented with rated power of 300 W and three ports voltages of 48, 72, and 200 V to verify the feasibility and effectiveness of the theoretical analyses. The highest measured efficiency is 98.4%.