A frequency response approach to design Buck converter with over current protection

摘要

This paper presents frequency response method for design of PI compensators with the voltage and current feedback loop. DC-DC converters have non-minimum phase so the output voltage cannot be directly regulated by the PI control. The average inductor current indirectly regulates the voltage so here the system dynamics are regulated. A detailed design procedure of voltage and current feedback loops are given with a step -by-step procedure of compensator design with stability, steady state accuracy and speed of response assessments on dual loop controller. Here the voltage and current loop dynamic response of a 100 watt Buck converter is reported using PI controller. The experimental result demonstrates that the model can correctly predict the dynamic and steady state behavior of a buck converter.