To improve the efficiency of a dual-active-bridge (DAB) converter,a control strategy of minimum current stress with varying switching frequency control is proposed. First,the minimum-current-stress-optimized control method when the voltage changes in a wide range is analyzed,the expressions for the conduction loss and switching loss of the DAB converter under light load conditions are established,and the conduction loss and switching loss at different switching frequencies are further compared. Then,the implementation method for closed-loop control and the power transmission range in each mode are introduced in detail. Under light load conditions,the proposed method can significantly reduce the current stress while improving the efficiency of the DAB converter. Finally,simulation and experimental results verified the advantage of the proposed control method.
关键词
双有源桥变换器/DC/DC变换器/最小电流应力/变频控制/效率优化
Key words
Dual-active-bridge(DAB) converter/DC/DC converter/minimum current stress/varying switching frequency control/efficiency optimization
维普
万方数据