Design PI+Approximation 2DOF Digital Control for Improve Response of Interleaved Buck Converter

In this paper, if parameters of interleaved buck converter is small changed but the dynamic characteristics are changed large, that is, the interleaved buck converter has nonlinear characteristics. Therefore, using the original controls is not appropriate. In this paper, proposed a PI+A2DOF digital controller (Proportional Integral plus Approximate 2 Degree Of Freedom) for regulation output voltages when sudden load change. The controller is implemented by Microcontroller has serial number MIMXRT1062DVL6A of Freescale semiconductor. Experimental studies between the PI and PI+A2DOF controller. In the PI+A2DOF controller has overshoot smaller less than 50mV or 1.51%. On the other hand, PI controller has overshoot about 200mV or 6.06%. It is demonstrated from experiments that the PI+A2DOF controller can be regulated output voltages.