Dimensioning of a transformerless photovoltaic inverter circuit for thin-film or back-side contacted solar modules

This paper deals with the dimensioning of a single-phase transformerless photovoltaic inverter circuit. The circuit contains a flying capacitor and allows the connection of one pole of the solar generator to the neutral conductor. The intended purpose of the design guidelines is the minimization of size and costs and the increasing of lifetime. A prototype inverter with silicon carbide MOSFETs is built up. It reaches a very high efficiency of up to 98.8 percent and is used to verify mathematical models.