PhD Defence by Bima Nugraha Sanusi

Supervisors:

• Principal supervisor: Associate Professor Ziwei Ouyang, DTU Electro, Denmark.
• Co-supervisor: Professor Cathrine Frandsen, DTU Physics, Denmark.
• Co-supervisor: Affiliated Associate Professor Marco Beleggia, DTU Nanolab, Denmark.
• Co-supervisor: Associate Professor Flemming Jensen, DTU Nanolab, Denmark.

Assessment committee:

• Professor Michael A.E. Andersen, DTU Electro, Denmark (chair).
• Associate Professor Drazen Dujic, EPFL (École polytechnique fédérale de Lausanne), Switzerland.
• Professor Qiang Li, Virginia Tech, USA.

Master of the ceremony:

• Associate Professor Gabriel Zsurzsan, DTU Electro

Abstract:

What is the societal problem?
High-efficiency and high-power-density end-use of electricity is one of the key challenges to increase the economic growth rate with a minimal environmental impact. In particular, small and efficient power supplies can lead to a very large market of smaller and greener electronic devices. The project primarily aims for very efficient power management from the USB port to the battery within the next generation of fast-charging smartphone.

With what are you solving it?
The challenge in realizing smaller, faster, and in turn greener power supplies is the integration of magnetic materials that can operate efficiently at high frequency. This PhD project will focus especially on the characterization of a new material developed by DTU and integrating that material into an optimally designed inductor for the power management.

What is the result?
The new material can be used at up to 3 times higher frequency than the comparable commercial material. The new inductor reduces the power management converter volume by 3 times. The final prototype can charge up to 24 W in one module. With this technology, your phone has a potential to be able to charge from 0 to 100% in a very short time, while you are cooking spaghetti.