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EMB1499Q: Difference between charge efficiency and discharge efficiency

Will Wang47
Expert 7710 points
Other Parts Discussed in Thread: EMB1499Q

Hi team,

I'm looking at our EM1401 EVM for our customer use our total solution in their product. The bidirectional DC/DC converter is controled by EMB1499Q, and I have one question about the efficiency. 

I see the charge efficiency from the test report http://www.ti.com/lit/ug/tidu379/tidu379.pdf, page 15, the converter charge efficiency is a little bit higher than the discharge efficiency, could you tell me why this happens?

Thanks and Best Regards,

Will

  • 0
    TI__Genius 11480 points
    Hi Will,

    I believe that this is because the inverter topology can achieve Zero Voltage Switching (ZVS) in one direction, but not the other. The ZVS conditions allow for higher converter efficiency
  • 0 in reply to David Wiest Jr
    TI__Expert 7710 points
    Hi David,

    Thanks for your reply.
    I have learned the DC/DC converter is an active clamp forward converter. When charge the battery, the converter primary MOSFET achieve soft switching, and I find a lot of materials explain the detailed operating process. However I'm confused about the discharge working process, I mean the detailed working flow. So could you give me some detail explanation of the discharge working process? Or is there any related application notes, simulation files that you could share with me?

    Thanks and Best Regards,
    Will
  • 0 in reply to Will Wang47
    TI__Genius 11480 points
    Hi Will,

    You are correct. The discharge process is not easy - i will give you that.

    I will look your email up -I have a couple of preliminary app notes that may help you.