PID controller for DC-DC Converter using Ziegler Nicholas Method

This paper deals with the Ziegler Nicholas method which is one of the routine to reduce the non-linearities in the response of a DC-DC converter. A controller is used along with the converter to reduce the deviation of the observed output from the desired set value. The two main parameters that have been used here to assess the performance of the converter as well as the controller is the settling and rise time of the output. These values need to be minimized to achieve a higher efficiency, improved phase margin and loop bandwidth. In this paper, a PID type of controller is described using the Ziegler Nicholas (ZN) method for tuning which improves the dynamic response of the DC-DC Buck type of converter under load and input variations. It is found through the simulation results that the proposed method is having a rise time of 1.3ms, settling time of 2.5ms and overshoot of 0.0096%. The variations in the response on account of the input and load variations are also minimal in the discussed method which could be neglected.