Secondary side modulation of a single-stage isolated high-frequency link microinverter with a regenerative flyback snubber

This paper presents comprehensive analysis of a single-stage, isolated, high-frequency ac link based dc-ac converter suitable for PV microinverter applications controlled using phase modulation of the cycloconverter devices (secondary side modulation). A flyback-based regenerative clamp circuit is used for mitigating voltage-spikes on the secondary devices arising due to leakage inductance induced oscillations. Experimental results on a 225 W laboratory prototype are presented to illustrate the discussed principles.