Design A Compensator For DC-DC Converter

Hamidon Paizal , Ahmad Puad (2008) Design A Compensator For DC-DC Converter. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

An open-loop DC-DC converter cannot regulate its output voltage due to varies in input voltage or changes at load. Compensator is used to overcome this problem so that the converter will produce a stable output voltage. This project presents a UC3525A IC based analog control design and implementation. The aim of this project is to develop loop compensation. For this purpose, the basic circuit configuration used is the buck converter. By the way, loop compensation frequency domain responses analysis and design process for a compensator is presented using MA TLAB package. Within the aim to increases the loop phase, Type 3 compensator is used because the phase margin of the open loop DC-DC converter is less than the desired closed loop phase margin at the desired crossover frequency. The compensator block is responsible for providing sufficient gain to make the output voltage very nearly equal to the reference voltage (times a constant) and sufficient phase margin so that the output voltage doesn't ring or oscillate in response to a load step. At the same time, too much phase margin will cause the output voltage to respond too slowly to a load step. Finally, MA TLAB based analog control design approaches presented here are finally validated with multiple test results from a prototype converter.

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