Digital current mode control approach for the parallel module DC-DC converters

This paper presents the digital current mode control employing nonlinear resistive current mode control and digital state feedback control using the pole placement technique for parallel interleaved DC-DC converters. The former method achieves current sharing by converting the effective input characteristic of the converters seen by the source to a resistive load sink. The latter method derives the discrete state feedback controller structure for robust tracking control using the error state. For the design example of the two control scheme, a prototype hardware system with two 100 W parallel module buck converters with a TMS320F2812 DSP has been built and tested.