具有强抑制干扰能力的BOOST变换器控制策略研究

作为定值控制系统的BOOST变换器,系统的抗干扰性尤为重要。为了提高BOOST系统抗干扰能力,本文通过对BOOST变换器小信号模型的详细分析,结合有输入电压前馈和无前馈情况下,采用电压模式控制时系统的特性,提出了一种前馈—电压模式的控制方法,能快速抑制输入电压和输出电流扰动,尤其能将输入电压的干扰近似完全消除;通过对双极点—双零点控制器的详细分析,提出了快速合理的设计boost变换器在新控制策略下控制器参数的方法。最后通过仿真验证了该控制策略抑制干扰的优越性和控制器参数设计方法的合理性。这种控制方法的思想同样适用于其它DC-DC变换器。

Research on the Control Strategy of Boost-type DC-DC Converter with Capability of Strong Suppressing Disturbances

As a fixed value control system,the interference of the boost-type DC-DC converter system is particularly important.In order to improve the anti-interference ability of the Boost system,this article analyzes the small signal model of the Boost-type DC-DC converter in detail.Meanwhile,with the help of the system characteristics when the Voltage—Mode control strategy is employed with and without input voltage feed-forward,a new control method named input voltage feed-forward—Voltage-mode Control is introduced,which can fast suppress the input voltage and output current disturbances.Especially the input voltage disturbance can be removed completely in approximation.And then on the base of analyzing the Two Pole—Two Zero controller,it also offers a method of fast deciding the control parameters for the new control strategy.According to the simulation,the superiority of the new control strategy’s Capability of Suppressing Disturbances and the rationality of the method of the parameter selection are proved.The thinking of this control method also can apply to other DC-DC converters.