Navitas details GeneSiC tech as it signs up German inverter designer

Navitas details GeneSiC tech as it signs up German inverter designer

Technology News |
By Nick Flaherty

Navitas Semiconductor has signed up the Katek Group in Germany to use its GeneSIC silicon carbide MOSFETs for a new generation of solar panel inverters.

Navitas is well established with gallium nitride wide bandwidth devices but has recently branched out into SiC through the acquisition of GeneSiC.

The GeneSiC technology is a ‘trench-assisted planar-gate’ structure where the gate is on the surface on top of a trench diode.

This allows a case temperature up to 25°C lower than planar SiC devices and can extend the lifetime by a factor of three. The devices have the highest-published 100%-tested avalanche capability with 30% longer short-circuit withstand time and a stable threshold voltage for easy paralleling.

The devices are being used for a 4.6 kW solar inverter design under the Steca brand.

The coolcept fleX model solar inverter converts DC power from a string of solar panels into 4.6 kW AC power for use in the home, returning to the grid, or being stored locally for later use – to smooth demand and/or support power during an outage.

Each 4.6 kW Steca coolcept flex inverter uses 16 of the 1200V GeneSiC G3R75MT12J SiC MOSFETs switching at 50 to 60kHz.

The 75 mΩ-rated devices are used in a two-level converter, with bi-directional boost converters and an H4-topology for AC voltage output. The higher switching frequency shrinks the size and weight of ‘passive’ components, which optimizes the size and weight of the inverter compared to legacy silicon-based inverters.

The key is the small increase in RDS(ON) with temperature and small capacitance giving lowest overall high-temp, high-switching performance says Navitas.

“Next-generation GeneSiC technology has enabled a major step in system performance without compromising our high engineering standards, especially regarding EMI,” said Dr. Peter Grabs, Katek’s Director of Innovation, Research and Development. “Navitas’ excellent quality – with zero failures – and consistent, short lead-time delivery are critical success factors as we expand production into new markets.”;;


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