Development of Robust Discrete controller for Double Frequency Buck converter

A discrete controller is designed for high efficiency double frequency buck converter. This double frequency buck converter is comprised of two buck cells: one works at high frequency, and another works at low frequency. It operates in a way that current in the high frequency switch is diverted through the low frequency switch. Thus, the converter can operate at very high frequency without adding any additional control circuits. Moreover, the switching loss of the converter remains small. The proposed converter exhibits improved steady – state and transient response with low switching loss. A digital compensator further improves the dynamic performance of the closed loop system. Simulation of digitally controlled double frequency buck converter is performed with MATLAB / Simulink. Experimental results are given to demonstrate the effectiveness of the controller using LabVIEW with a Data Acquisition Card (NI 9221).