A Novel Approach to Control a DC-DC Converter Using its Empirical Physical Model

To overcome the limitations of PID controller, a new controlling method for DC-DC converter has been proposed in this article based on the empirical physical model of the converter. The proposed controller ensures both load regulation and line regulation in the system with one feedback loop and stabilizes with a few iterations, while maintaining a fast response and a simpler structure compared to the existing models. Unlike the existing state-space averaged model analysis, this paper presents a new mathematical analysis to adapt the duty cycle of DCDC buck converter upon changing the dynamics of the system. Considering all the non-ideal parasitics, a mathematical equation is formulated for buck converter to establish a relation between the parameters of the circuit under steady state conditions. Based on this equation the system can be controlled digitally by estimating the parameters empirically in prior. Further, an experimental study is given in this paper to validate the proposed method. Based on the experimental results it can be concluded that the proposed method improves the dynamic response of buck converter.