并联Buck变换器反步均流控制律的设计

Design of backstepping current sharing control law for paralleled Buck converter

在电感电流连续导通的模式下,提出一种基于反步法的并联Buck变换器的均流控制方法。该方法在并联Buck变换器状态方程的基础上,引入一个表示电感电流间误差积分的状态量,然后拓展状态向量,得到拓展后的状态方程,针对该状态方程,根据反步法的原理,设计了并联Buck变换器的反步均流控制律。仿真结果表明,反步均流控制可以实现良好的均流效果,与自主均流控制相比,具有更强的鲁棒性。

A current sharing control method of paralleled Buck converter is proposed based on backstepping method in continuous conduction mode of inductor current. On the basis of state equation of paralleled Buck converter, a state which expresses the integration of error between inductor currents is introduced and then the state vector is expanded and the expanded state equation is obtained. For the proposed state equation, according to the principle of backstepping method, the backstepping current sharing control law of paralleled Buck converter is designed. The simulation results show that the backstepping current sharing control can achieve good current sharing effect and has stronger robustness than the automatic current sharing control.