🎉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!

Investigation and compensation of the nonlinearity of the inverter

The GaN transistors offer a significant performance increase in the low voltage pure sine wave motor inverters by increasing the switching frequency so that only the fundamental sinusoidal voltage is applied to the motor. This is useful for high speed applications where low electromagnetic interference are required, for example in a medical hand-held high-speed drill. The LC output filter in the TAPAS board will filter the harmonics at the switching frequency so that the output waveform contains the fundamental sinusoidal voltage. However, the transistor needs a dead time that for the LM5113-EPC2021 combination is in the tens of nanoseconds and the source-to-drain voltage that is 1.6V, larger that the on-state voltage drop given buy the current and on resistance of 1.8mOhm. This will introduce an error in the fundamental voltage that is dependent on the switching frequency, DClink voltage and output current. This error will affect also the motor control at low speed and startup. This error is little understood for the new generation GaN transistor based inverters.
The goal of the project is to investigate the nonlinearity of the inverter and optimize the method to compensate it, taking into account also the output filter.
The inverter will supply a motor and the output voltage will be measured with a PiscoScop 5444B 16 bit resolution oscilloscope in order to account for the error in the mV range included in the tens of volts of switching  output voltage. The output voltage spectrum will evaluate the presence of the distortion. Then the nonlinearity of the inverter will be identified and a compensation algorithm will be implemented.Then the output voltage spectrum will be evaluated again.

  • Stefan George Rosu
  • Mar 21 2018
  • Mar 21, 2018

    Admin Response

    This idea will get a TAPAS dev kit.

  • Admin
    Nora Schille (TAPAS team) commented
    March 21, 2018 12:41

    Hey Stefan,
    neat idea. We had that on the agenda for some time. Please don't forget to send us some Bode-Plots when you are done :)
    Congrats, you will get a board! Our team will contact you shortly.


  • Admin
    Nora Schille (TAPAS team) commented
    June 04, 2018 13:22

    Hi Stefan,

    how is it going? Do you need any help regarding the realization of your project?
    Did the board arrived? 
    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 12:07

    Hi Stefan,

    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!