Performance Study of PID and Voltage Mode Controllers in Voltage Regulator for Smart DC Wall-Plug

This paper presents a comparative study on the performance of PID and Voltage Mode Control (VMC) in a step-down voltage or buck DC-DC converter. The converter is being used in a smart wall plug for powering electrical devices in future smart house or building. Computer simulations using Simulink were performed to model the controllers in the converter and to investigate their performance. Results indicate that longer time is required by the VMC to reach a similar steady state condition as that acquired by the PID on the output voltage of the converter. Additionally, the steady state error on the output voltage from the PID was observed to be less than 1%, which is better than percent error obtained from the VMC.