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IGBT modules for 3-level inverters offer industry-leading current density performance

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By eeNews Europe


The use of one phase leg per module allows the development of compact inverters with output power of up to 85 kVA. MiniSKiiP is characterised by fast and easy single-screw assembly and is therefore optimised for the efficient manufacture of 3-level solar inverters and UPS systems.       

The rated current per unit of area is up to twice that of other 3-level modules. Since no solid busbars are needed between the three phases, and hence the modules, more-compact inverters can be made. The reverse voltage of the IGBTs and diodes used has been increased to 650 V to enable DC link voltages of up to 900 V for the 480 V three-phase power applications typical in commercial or industrial applications. Each module has a 3-level phase leg comprising ten power semiconductors.     

Thermal and electrical connection between the module, the heat sink and the driver board is established with a single screw or two screws for rated module currents of up to 150 A or 200 A respectively. This means that solder equipment and time-consuming soldering processes are not needed at final-stage assembly.      

For solar inverter output power of 60 kVA and above, i.e. for rated current of 150 A and higher, modules with screw connections were previously used for the busbars. Thanks to MiniSKiiP 200 A 3-level modules, the busbars can be replaced with cheaper PCBs in inverters with outputs of up to 85 kVA. Former complex 8-screw connections have been reduced to simple 2-screw-assembly solutions.   

The 3-level product range from Semikron covers rated currents of 20 A to 600 A: featuring SEMITOP solder modules for up to 150 A, MiniSKiiP spring contact modules for up to 200 A and SKiM screw connection modules for up to 600 A.     

Visit Semikron at www.semikron.co.uk.


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