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2 output in SEPIC converters

lw1dse
Prodigy 60 points

Hi all guy's there. I'm designing a low power SEPIC converter, which inputs with +275V and I need to output with +350V. Also, I would need a +100V output, both at no more than 20mA. I suppose that placing a tap on the output side inductor, I can get the low voltage directly, scaling down the turns ratio, as in a transformer. Is it true?

Have you a nice 2014 and merry Christmas, for you and yours.

  • 0
    TI__Mastermind 35165 points

    Hi Osvaldo,

    This should work. Here's an article with an example of doing that exactly.

    http://www.eetimes.com/document.asp?doc_id=1273311

    Merry Christmas to you too.

    Regards,
    Anthony 

  • 0 in reply to Anthony F
    Prodigy 60 points

    OK, many thanks. But I still have the question, if the tap at the secondary is taken simply as a voltage autotransformer in the winding. Also, I´m thinking of how to design the common part of the inductor as it carries both ripple, peak and averages currents,  and if they simply adds together to calculate copper section. And also, what happen with cross regulation, and what happen if one of the outputs runs continuous and the other, discontinuous, for example.

    The project sound crazy because of the voltages and currents involved, but too much crazy is the active devices used in this project. When finished, I´ll post some photos of it.

    Cordially, Osvaldo.