DSP Based Control of Parallel DC-DC Buck Converters by Optimal Multi-Input Multi-Output Discrete Integral Variable Structure Control Scheme

A new control scheme for current distribution in parallel connected DC-DC converters is presented. It uses an optimal multi-input multi-output (OMIMO) discrete integral variable structure controller (DIVSC) to achieve both output current equalization and output voltage regulation. The controller improves the dynamic performance of a parallel buck converter; the output voltage is robust against load disturbances and the output currents are very well equalized. The analysis and design of the controller is developed. Automatic master slave method is adopted in this work. DSP based experimental results show good dynamic performance of the proposed control scheme.