开关DC/DC变换器多级脉冲调节控制方法

摘要

提出了一种新型的开关DC/DC变换器控制方法--多级脉冲调节(MPA)控制方法.MPA控制器在每个开关周期起始时刻根据变换器的输出电压误差,在强弱等级不同的多级脉冲中选取一个作为该周期的有效控制信号.文中分析和讨论了MPA控制原理,研究了工作于电流断续模式的MPA控制Buck变换器的工作过程和小信号模型.分析结果表明,MPA控制具有优异的鲁棒性、瞬态特性和稳态特性.仿真和实验结果验证了理论分析的正确性.%A new control technique for switching DC/DC converter, Multilevel-Pulse Adjustment (MPA), is proposed in this paper. Based on the output voltage error at the beginning of each switching cycle, MPA controller selects one control pulse among multilevel pulses as the control signal of converter at this switching cycle. The principle of the proposed control technique is analyzed and discussed. The operation states and small-signal model of MPA controlled Buck converter operating in discontinuous conduction mode are analyzed and studied. Analysis results show that MPA scheme is easy to realize, has great control robust, transient and steady state performance. The simulation as well as experimental results verifies the advantage of the proposed control techniques.