【摘要】 为了提升电感电流断续模式(discontinuousconductionmode, DCM)下开关电源转换器的瞬态响应性能,提出了一种基于电荷平衡原理和平均电流的差分外推控制方法.以Boost转换器为例,该方法利用采样的输出电压进行差分外推(differential extrapolation, DE),预估负载对电荷的影响,进而通过平衡算法得到电流控制量.相较传统的使用电荷平衡原理的电流控制方法(charge balance principle based current control, CBPC),差分外推控制方法缩短了负载估计的延迟,减小了负载估计误差,为DCM转换器的控制设计提供了有效参考.通过Boost样机实验对比了CBPC控制与DE控制在输入、负载和参考电压发生扰动时的响应波形,结果表明,本文提出的DE控制对扰动的响应更加优异.更多还原

【Abstract】 In order to improve the transient response of the switching converter indiscontinueous conducting mode(DCM), a differential extrapolation control method is proposed based on the charge balance principleusing Boost convertor as an example. This method uses the variation of sampled output voltage to carry on an extension, which indicates the load influence on the output capacitor charge, and then obtains the current control quantity by the balance algorithm. Compared with the traditional charge balance principle based current control(CBPC), this method reduces control delay and the transient instability caused by the approximate of load information.The method also providesreferencefor thedesign of DCM controllers.The response waveforms of CBPC control and DE control are comparedby Boost prototype, when input, load and reference voltage are disturbed. Among these experiments, the response is better when using DE control proposed in this paper.更多还原