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 softswitching 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.