Comparative Study of the Open-loop Boost Converter and the Closed-loop PID Controlled Boost Converters

Abstract

This research compares the output voltage and harmonics of open-loop and closed-loop PID-controlled boost converters. Open-loop systems produce output based on their input voltage. The output voltage's THD & the capacitor's and inductor's input and output currents' THD don't change much with voltage. Using the same circuit and setting the reference voltage at half the open loop output voltage, the closed-loop system's output voltage remains almost constant for input voltages below the reference value. If the input voltage crosses the reference voltage, the output voltage jumps up somewhat. The closed-loop method is less effective than the open-loop method since the output voltage THD and the input and output current THD of the inductor and capacitor are higher and vary more with voltage. Open loop output voltage THD was 375.06% and closed loop THD was 1742.84% for a 17-volt input.