🎉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!

Sparkless Spot Welding Gun

A known problem (and possibly the biggest one) in automotive body shops are the sparks caused by welding spot guns. They happen when a high valued electrical current passes through a big resistance (e.g dirty metal sheets). Although control algorithms have been proposed for more than 30 years in order to improve the welding spots quality and minimize the sparks, the time interval between sensing and actuating is still insufficient for avoiding them, since welding spot guns inverters were implemented with insulated-gate bipolar transistors (IGBTs), so far. The recent improvement in GaN-based power electronics, which support switching frequencies up to 600 KHz can represent a breakthrough in this field by reducing or even eliminating the sparks in such applications. Even more, as current and voltage sensing and control are already implemented in the TAPAS board, the entire control will be defined by software and just a minor hardware must be added as a front end, enabling a fast prototyping and testing stage.



To build a sparkless spot welding gun prototype.


Technical set-up

The TAPAS board output (one phase only)  will be connected to a transformer, capable of raising the TAPAS output current to hundreds of Amps. The secondary will be connected to the electrodes, which press two (or even three) metal sheets. Some simple but low frequency implementations are available in the internet, and will help us through this process. The control, including instant resistance measurements, will be software defined.



A simplified schematics is attached.



Leo Botler

Amer Kajmakovic

Simon Mayer

Daniel Kraus


How Many TAPAS Boards

1 TAPAS board would be enough for the first implementation. Nonetheless, the authors would ask for 3 boards, so that we can keep track of the evolution of our prototypes (improvements might occur) and thus, present all of them operating at the same time.

  • Leo Botler
  • May 28 2018
  • May 30, 2018

    Admin Response

    this idea gets threeTAPAS dev kits

  • Susanne Forster commented
    May 29, 2018 14:03

    Hey Leo, 

    great idea!
    We want to provide you 3 TAPAS boards.
    One of my colleagues will message you shortly.

    Susanne @ TAPAS team

  • Admin
    Nora Schille (TAPAS team) commented
    June 04, 2018 09:11

    Hey ho Leo,

    as we recently notice you and your team submitted another idea, we are really curious to see the latest progress of this idea :-)
    Please post the latest progress and also keep in mind the deadline of 24th of June!

    Our team is looking forward to your feedback.
    Nora @ TAPAS team

  • Admin
    Nora Schille (TAPAS team) commented
    June 04, 2018 14:30

    and something else...
    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 12:55

    Hi Leo,

    Don't forget that the submission deadline for your presentation is on 24th of June! We are already curious to see the results of your project :-) Keep in mind that you still have time to work on the implementation of your idea after the submission!

    Please post your project visualization and all related documents within your idea board entry :-)


    Jacqueline @ TAPAS Team

You can read the official challenge FAQ here!