🎉We can now proudly present the winners of the TAPAS Community Challenge 2018! 🎉
Congratulations to Team "Wireless Charging" (idea 56). We are really excited for all finalists and a really big thank you to all participants for your interest in this challenge!

We got over 200 submissions! 65 ideas got one or more TAPAS boards, 10 submissions were presentation-ready.
And now we have 5 finalists! YEAH 😃 The finalist's idea numbers were 40, 56, 68, 212 and 213.
What's next?
We are now preparing the next steps for you, the community. Please stay tuned!
We are working on a forum and a separate webpage. If you have any question please don't hesitate to contact us via email!

A Bidirectional Wireless Battery Charger

A Bidirectional Wireless Battery Charger Based on Siemens TAPAS Boards

 Haimeng Wu, Bowen Gu, Xiang Wang


Wireless power transfer (WPT) technology is able to provide a reliable, flexible and cost-efficient power delivery solution in many environments which are hindered by the wires connection, showing huge potential in various fields such as home appliances: the incompatibility of charging interfaces of electronic products has been greatly improved; the medical applications: it is not necessary to replace the battery of pacemaker; electric vehicles which are most concerned field of WPT: help significantly to reduce the charging infrastructure, also to improve the charging secure and convenient. 

The power electronics technology plays a significant role in the development of the WPT system, which is the fundamental technique in a wireless charging system. However, most of the existing developed wireless battery chargers are unidirectional because of the diodes bridges used on the receiver side to rectify the AC power signal from the transmitter. In this project, we aim to design a bidirectional wireless charging system using the TAPAS boards. The TAPAS board is designed as a software-defined inverter for the educational purpose by SEIMENS. There are several unique features integrated in TAPAS such as the high switching frequency by using 3-phase GAN devices; the flexible communication with the external device and multifunctional implementation via changing the software. With these advantages of the TAPAS boards, a bidirectional wireless battery charging system can be developed in a battery-to-battery energy storage system.

In the project report, the principle of the proposed circuit has been studied and verified in the simulation tools Matlab/Simulink and the electromagnetic coupling coefficient between the resonant coils has been analyzed in ANSYS for further investigation. A prototype of the proposed wireless charging system has been designed and tested and the experimental results successfully validate the theoretical analysis and demonstrate the charging performance of the developed system. Based on the project investigation, the GaN technology may bring in the potentials to develop the advanced compact wireless charging system.

The main research work of the project has been conducted in the following areas:

  1. Design of a bidirectional wireless charging system using the TAPAS boards
  2. Theoretical analysis of the power circuit operation with Matlab/Simulink
  3. Investigation of the electromagnetic coupling coefficient of the resonance coils using ANSYS
  4. SPI communication on the wireless transceivers modules of nRF24L01+
  5. Programming on the closed loop phase shift control algorithm
  6. Design and test of the prototype with the practical battery power supply and load



 For the further information, please find the report and presentation slides attached for the project.

Here is the link of a brief introduction video:


Please contact me if you have any questions about our project. Here is my email address:


Thank you.


Haimeng wu

  • Haimeng Wu
  • Apr 17 2018
  • Jul 6, 2018

    Admin Response

    This idea submission is among the finalists and will be presented at the CKI Conference in Erlangen.

  • Admin
    Nora Schille (TAPAS team) commented
    April 24, 2018 09:43

    Hey Haimeng,

    thanks  for your submission! We will provide you two boards and are curious to hear about your progress. :-)
    One of my colleagues will message you shortly.

    Nora @ TAPAS Team

  • Haimeng Wu commented
    April 24, 2018 10:57

    Thanks Nora. It's great to hear from you. We are looking forward to having the boards soon.

  • Admin
    Nora Schille (TAPAS team) commented
    June 04, 2018 13:37

    Hey Haimeng & team,

    how is it going? Do you need any help regarding the realization of your project?
    Here is just a friendly reminder that submission deadline for your presentation is on 24th of June. :-) We are really excited to see your progress! 
    Please post the progress within your idea board submission.

    PS: We want to do a community call with you! Please use our doodle to find a date which fits best for you. :-)

    Nora @ TAPAS Team

  • Jacqueline Hofmann commented
    June 20, 2018 12:27

    Hey Haimeng & team,

    Please keep in mind that the submission deadline for your presentation is on 24th of June! We are already looking forward to seeing how you brought the TAPAS board to life! :-) Remember that you still have time to work on the implementation of your idea after the submission!

    Please upload your presentation and everything you want to share with us in your idea board entry.

    Good luck :-)

    Jacqueline @ TAPAS Team

You can read the official challenge FAQ here!