• State Resolved
  • Locked Locked
  • Replies 9 replies
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 1429 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SM72295: Could you tell me a transformer part number can be used for 50Hertz Xfrm shown on page 3 of application note, SLAA602A?

Kazuya Nakai59
Guru 20130 points
Part Number: SM72295
Other Parts Discussed in Thread: TIDA-01292

 Hello guys,

 One of our customer is interested in application note, SLAA602a, 800VA Pure Sine Wave Inverter’s Reference Design.

(http://www.ti.com/lit/an/slaa602a/slaa602a.pdf)

They want to know transformer parts number can be used for 50Hertz Xfrm shown on page 3 of  the application note as a example.

 Could you please tell me any parts number can be used for the transformer?

 Your reply would be much appreciated.

 Best regards,

 Kazuya Nakai.

  • 0
    TI__Genius 12990 points
    Hi Kazuya,

    Thanks for your question and interest with SLAA602a. I am an applications engineer working with this application note and will help solve your question(s).

    It can be seen through out this app note, for instance in figure-15 note-1 -> the 50Hz XFRM used is not on the main board. Since the part number is not there, this is confusing. As an action item, I will seek out the designer and ask as well as if I cant find a part number I will spec out the XFRM they used and update you in 24-48 business hours.

    Thanks
  • 0 in reply to Jeffrey Mueller
    Guru 20130 points
    Hi Jeff,
    Thank you very much for your reply. I see. I'm looking forward to getting your next reply.

    Thank you again and best regards,
    Kazuya Nakai.
  • 0 in reply to Kazuya Nakai59
    TI__Genius 12990 points
    Hi Kazuya,

    Thanks a lot for your patience, let me explain my findings.

    After a lot of searching I was able to get everyone's opinions that was a part of the app note except for the main designer who is no longer in reach. So, since there is no official PN from the designer, Ive only been able to find potential fits for our 50 Hz transformer. I am still in the process of specing things out internally via conversation with the designer however things are delayed due to logistics.

    The transformer we are looking for is also in TIDA-01292 however its not in the BOM or spec'd out either. Typically we will buy the inverter and test with the transformer from that unit. Transformers are difficult to find the one you’re looking for because there are so many different variations and theres not one single widely known manufacture. I ended up at Digikey and put in our specs of 120V or 220V input, 12V output, 50/60 Hz, and about 1kVA as well as dual secondary taps for an AUX winding.

    I found (belfuse.com/.../MPI.pdf) – MPI-650-24 and this single transformer costs upwards of $200 which is probably way too high. I understand this is not exactly what your looking for. My action item still remains to contact the designer and confirm that MPI-650-24 is a viable solution for app note 602a.

    Thanks,
  • 0 in reply to Jeffrey Mueller
    Guru 20130 points
    Hi Jeff,

    Thank you very much for your strong support. I understood your current stuation. Also I can wait for you reply to our question.
    I'm looking forward to getting your reply.

    Thank you very much again and best regards.
    Kazuya Nakai.
  • 0 in reply to Kazuya Nakai59
    TI__Genius 12990 points
    Hi Kazuya,

    Thanks again for all your patience.

    I was able to confirm that the Belfuse transformer mentioned last time will work for this application. Like I said it is expensive! This type of transformer is common in India and happens to be very inexpensive. However there might be an issue with procurement.

    Anyhow I should mention, www.indiamart.com/.../inverter-transformer.html
    the transformers here will also suffice and shouldn’t cost more than 2000 Rupees or about $30 for one piece.

    As far as specs go, since we are not winding the Xfer ourselves we only need to know a few details! Specifically, the supplier needs to know; VIN/VOUT max/typical and the max current of the primary or secondary side. They will figure out turns ratio, wire size, etc.

    If interested on calculations needed for a full bridge check out section 5.1 from www.ti.com/.../sprabw0c.pdf
    I’ve been trying to obtain the appropriate core area, window factor, current density and flux density however the manufacture might be the best source of this info for your specific application. Do you need these parameters to proceed?

    Thanks,
  • 0 in reply to Jeffrey Mueller
    Guru 20130 points
    Hi Jeff,

    Thank you very much for your strong supports.

    I will tell the customer your input and ask them whether they need more information from TI.
    I will reply you within 1 week. Could you please wait my reply until it?

    Thank you very much again and best regards,
    Kazuya Nakai.
  • 0 in reply to Kazuya Nakai59
    Guru 20130 points
    Hi Jeff,

    We discussed the customer for the transformer. They knew that the transformer size would be bigger than they expected.
    They will start to find other solution in TI designes again. So you don't need to find the parameters. I really appreciate for your strong support.

    Thank you very much again and best regards,
    Kazuya Nakai.
  • 0 in reply to Kazuya Nakai59
    TI__Genius 12990 points
    Hi Kazuya,

    Thanks for your active engagement as well, sounds good thanks for letting me know. If you need any more help with finding another TI design please reach out to me on this thread or you can post a new one as well.

    Thanks,
  • 0 in reply to Jeffrey Mueller
    Guru 20130 points
    Hi Jeff,

    Thank you very much for the kind comment!

    Best regards,
    Kazuya Nakai.