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Rewarded with the Semikron Young Engineer Award 2018, ACDC Cube is a single-stage, bidirectional and high-frequency isolated power conversion system. ACDC Cube also uses a novel control method to do the interface between the Alternate Current (AC) distribution network and a battery pack, or other Direct Current (DC) sources/loads, delivering higher power quality in a compact design.  

ACDC Cube has lower total volume and weight increased durability and equivalent reliability when compared with standard solution such as the voltage source converter plus dual active bridge. Due to its innovative features, ACDC Cube is especially suitable to applications where power systems dimensions have very tight limits.


Challenge | Opportunity

The need to integrate renewable energy sources and heavy loads such as electric vehicles in the low voltage grid is demanding for more flexible and reliable solutions such as community energy storage or vehicle-to-grid (V2G). Moreover, conventional power conversion systems are bulky and heavy.

INESC TEC engineers have developed ACDC Cube technology to offer new options for micro-generation systems, including the bidirectional conversion of electrical energy between home batteries or electrical vehicles (DC) and the public grid (AC), or any other devices where dimensions restrictions are critical.

Main Advantages

  • Compact solution with reduced weight and volume achieved through a new hardware solution;
  • Improved power quality in the electric grid interconnection due to the use of a new control approach;
  • Higher durability and reliability by using less capacitors;
  • Safe operation provided by galvanic isolation.


  • Vehicle-to-grid (V2G), enabling the bidirectional power flow  between an electric vehicle (EV) and the electric grid;
  • Aeronautical and aerospace applications where the size and volume of the power converters is critical;
  • Energy storage systems;
  • Solar inverter with integrated energy storage;
  • Community energy storage.

  • Technology Reference

  • Commercial Rights

  • Development Stage

    Lab prototype (TRL 3-4)
  • Further Information

    <div class=""><a href="" target="_blank">US9973107 (B2)</a></div> <div><a href="" target="_blank">JP2017528102 (B2)</a></div> <div class=""><a href="" target="_blank">EP3180849 (A1)</a></div> <div class=""> <p><a href="">Semikron Young Engineer Award 2018</a></p> </div>
  • IPR Status

    Patent Granted: Japan and USA; Patent Pending: Europe
  • Licensing Availability

  • Industrial Categories

  • Tags

    Power Conversion System, Energy Storage, Electrical mobility, Smart grids, Renewables, Efficiency, Power electronics