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

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.