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QFT based robust digital current-mode controller design for DC-DC fourth-order boost converter

This paper presents a Quantitative Feedback Theory (QFT) based robust digital current-mode controller design for point-of-load two-inductor fourth-order boost dc-dc converter suitable for use in dc nano-grids. QFT upfront takes into account the expected uncertainties in the source voltage, load and sensing noise during controller design. The converter models are formulated considering these uncertainties and used for controller design. The desired degree of robustness is achieved for the converter by enforcing minimum stability margins. The robustness features of the digital current-mode controller is analyzed through computer simulations and then compared both in frequency-domain and time-domain. The analytical concepts are then verified experimentally on a 28 V, 30 W laboratory prototype converter. Experimental and simulation results are in line with the analytical design studies.