German solar inverter maker Steca has gone for silicon carbide in the 4.6kW model of its latest grid-connected inverter for home use, the StecaGrid 4611_2, part of its coolcept fleX family.
It has adopted a two-level converter, with bi-directional boost converters and an H4-topology for the ac output, which uses 16x 1.2kV 75mΩ SiC mosfets – G3R75MT12J ‘trench-assisted planar-gate’ devices from Californian transistor maker Navitas, according to Navitas. Maximum input voltage is 750V and the part is TO-263-7-packaged with a Kelvin connection for source driving.
There are eight models in the coolcept fleX family, from 1.5 to 4.6kW and with one or two peak power trackers, all in IP65 housing for indoor or outdoor installation. These are single-phase models, and there are four more models with three-phase outputs – with inputs rated up to 1kV.
Electronics Weekly has asked for more information on the topology within these converters, particularly how 16 power transistors are needed for a two-input single-phase output inverter.
The only coolcept block diagram Electronics Weekly
can find so far
