Multi-mode quasi-Z-source series resonant DC/DC converter for wide input voltage range applications

This paper examines the quasi-Z-source series resonant DC/DC converter as a candidate topology for the PV module integrated converter (MIC) with an extended input voltage regulation range. The converter features multi-mode operation by combining the shoot-through pulse-width modulation and ordinary phase-shift modulation to realize the boost and buck operating modes, respectively. Our experiments confirmed that the proposed MIC is capable of ensuring the ripple-free output voltage of 400 V within the input voltage range of 10...60 V. In contrast to the traditional series resonant converter, the MIC proposed is characterized by fixed-frequency operation over the entire range of input voltage variations. It requires only generic semiconductor devices and thus is a cost-effective solution.