Power flow control of a triple active bridge DC-DC converter using GaN power devices for a low-voltage DC power distribution system

摘要

This paper describes the power flow control of a triple active bridge (TAB) DC-DC converter for a DC power distribution system. The proposed phase shift control utilized in power distribution is based on varying the phase shift angle among three ports of the converter. First the simulation system is a prototype 200-V TAB converter with double loads for low-voltage DC power distribution systems using the closed-loop phase shift control. In the experiment, an open-loop TAB converter rated at 500 W power was constructed and tested with double loads, using a three-winding transformer and Gallium Nitride (GaN) power devices. The smooth output waveforms indicate the good controllability of the power flow as well as functional performance in the low-voltage DC power distribution system.