Abstract
This paper introduces a transformer-coupled three-port three-bridge half-bridge bidirectional DC-DC converter with dead time phase shift control. The converter consists of a high-frequency three-winding transformer and three independent half-bridge circuits. The half bridge is coupled through a transformer to provide galvanic isolation for all power ports. The converter uses phase shift control to achieve energy flow control through pulse width modulation (PWM). By controlling the gate pulse by PWM, the control of the dead time is realized, and the dead time can effectively suppress the straight-through phenomenon of the switch in the multi-port system, which can reduce power consumption and protect the power device. Through mathematical derivation, a detailed theoretical analysis of the three-port steady-state output characteristics with dead time is carried out. A typical application of the proposed converter is an electric vehicle auxiliary power supply system with a photovoltaic cell/auxiliary battery/power battery. The effectiveness of the proposed converter was verified by MATLAB simulation software.
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