High-Efficiency MOSFET Inverter with H6-Type Configuration for Photovoltaic Nonisolated AC-Module Applications

By Wensong Yu, Jih-Sheng (Jason) Lai, Hao Qian, C. Hutchens. IEEE transactions on power electronics, 2011

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Topology Review and Derivation Methodology of Single-Phase Transformerless Photovoltaic Inverters for Leakage Current Suppression (2015, background): “Similarly, during the negative half cycle, switch S6 and diode D2 are in the turn-on state to achieve the decoupled zero voltage level [86].”
Transformerless Inverter Topologies for Single-Phase Photovoltaic Systems: A Comparative Review (2020, background): “topologies are presented like H6 with diodes-1 [34], H6 with diodes-2 [63], H6-1 [35], H6 in mid-switch [36], and midpoint switches with diodes [39], [49].”
A Bidirectional-Switch-Based Wide-Input Range High-Efficiency Isolated Resonant Converter for Photovoltaic Applications (2014, background): “It is also beneficial for galvanic isolation to be implemented in the dc–dc stage rather than the inverter stage to reduce the size of the isolation transformer and to increase the overall system efficiency [12], [13].”
Datasheet Driven Silicon Carbide Power MOSFET Model (2014, background): “INTRODUCTION UNIPOLAR devices like power MOSFETs are very attractive for switch-mode power applications due to several advantages over their bipolar counterparts such as faster switching speed, simpler drive requirements, and better current sharing due to the positive temperature coefficient of on-s”