Abstract: The application relates to an electric converter for converting AC or DC input into an electric AC or DC output. A swap circuit with controllable electric switches serves to selectively swap connection of a plurality of DC power banks (DCBs) between an input terminal and an output terminal, thus selectively connecting the DCBs to an electric source or an electric load. The DCBs are formed as series of interconnected submodules (SMs) each having electric energy storage elements (ESEs) and a switching circuit for selectively by-passing or connecting the ESEs. By properly controlling the swap circuit and the switching of the SMs, the converter can be used for DC-AC, DC-DC, AC-DC, or AC-AC conversion, allowing multilevel output.

Abstract: The invention relates to a thermal insulated building element, which together with connecting elements is suitable for making a building system quickly, which is also suitable for housing and extract fastening of any reinforcement. The thermal insulated element according to the invention has polystyrene elements with a loadboarding part containing a metal framework between the polystyrene elements said loadbearing part is filled with concrete in-site, furthermore has connecting elements joining the polystyrene elements, which is characterized by that, connecting elements joining the polystyrene elements (1) are plastic connecting elements (19) where fastening holes (8) serving joining the polystyrene elements as well as the nests (20) joining a framework (18) in a space (30) between the polystyrene elements are formed.