🎉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.
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Interleaved Boost converter with synchronous rectification for DC House

Motivation:

In a present-day house, most of the equipment (i.e. battery chargers, lights) require DC voltage. Renewable energy sources and storage system in a house also provide DC voltage. But due to AC distribution system inside house additional power conversion stages are required which decrease overall system efficiency and increase cost. In near future, power distribution system will be DC. An optimal voltage level for DC distribution system inside house considering lower conduction losses and safety is 48V. Solar panels and batteries are usually available with the voltage rating of 24V. This voltage difference between two voltage levels creates a need for a 24V to 48V DC converter. This converter needs to be small in size and have very high efficiency. The power rating of the converter is 200W. Estimated efficiency of the converter is 98%.

Method:

Main components contributing to the size of the converter are inductor, capacitor and heat sink. Size of the heat sink is directly related to the amount of losses occurring inside switching components. Size of the capacitor is dependant on ripple current in the output of the converter. Size of inductor depends on the amount of energy to be stored inside inductor. In order to decrease output ripple current, 2 phase interleaved boost converter is used. Both phases work with 180-degree phase difference which results in current cancellation in output, reducing output current ripple. Interleaving also reduces conduction losses in the switch. Further, the converter is operated in boundary condition mode at all load conditions which gives two benefits:1) decreased amount of energy stored in the inductor, 2) valley switch-on of the semiconductor switch. Valley switch-on of the semiconductor switch results in lower switching losses. In order to reduce diode losses, synchronous rectification is used.

Values of the input voltage, output voltage, Inductor 1 current and inductor 2 current values are fed into the microcontroller which generates 4 PWM signals for 4 switches. Inductor current sensors ensure converter is working in boundary condition mode at all time. PWM1/3 and PWM2/4 are complementary signals with sufficient dead time between them.

So, combining interleaving, boundary condition mode, valley switching and synchronous rectification will result in a converter with very high efficiency and small size.

Components:

2 TAPAS board. Total 4 switches are required in the converter. Each tapas board has 3 half bridges. In my design only bottom switch can be utilized as connection sequence of two switches is source-drain-drain-source as seen from the diagram. Whereas half bridge given on board has connection sequence of drain-source-drain-source.

  • Sagar Patel
  • May 30 2018
  • Jun 4, 2018

    Admin Response

    this idea will get two TAPAS boards

  • Admin
    Nora Schille (TAPAS team) commented
    June 04, 2018 09:21

    Hey Sagar,

    thanks for your submission.
    We want to provide you two TAPAS boards.
    One of my colleagues will message you shortly.

    Best,
    Nora @ TAPAS team

  • Admin
    Nora Schille (TAPAS team) commented
    June 04, 2018 14:50

    And something else...

    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. :-)

    Best,
    Nora @ TAPAS Team

  • Jacqueline Hofmann commented
    June 20, 2018 13:06

    Hey Sagar,

    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



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