Digital Voltage-mode Controller for Zero-Current Transition Fourth-Order Boost Converter

In this paper a digital voltage-mode controller is designed for a fourth-order zero-current transition boost converter. The proposed boost converter has lower current stress on the load side capacitor together with conventional boost converter voltage gain property. On account of soft-switching network it exhibits reduced switching losses during turn-OFF transition. The converter operating modes have been analyzed and then controller has been designed. As there are several operating modes in one switching cycle the small-signal z-domain transfer functions are formulated using identification toolbox of the MATALB, and then used in the direct digital controller is design. Converter performance, both soft-switching and regulation capability, is verified on a 12 to 24 V, 30 W prototype in simulation and then compared with experimental measurements. Experimental measurements are in close agreement with simulations.