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Thread: 1000w smps based on LUDO3232

  1. #321
    diysmps Senior Member
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    does this scheme work, ??
    FB_IMG_1532839375244.jpg

  2. #322
    .... Silvio's Avatar
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    Quote Originally Posted by Upik View Post
    does this scheme work, ??
    FB_IMG_1532839375244.jpg
    I cannot say I never tried it.

  3. #323
    That is not a PFC stage. That is just a high voltage boost converter with voltage regulation and no current limit protection. That circuit has 940uF of bulk capacitance after the rectifier, where as a PFC converter usually uses somewhere around 1uF or less, so that the input voltage to the boost inductor is able to track the sine wave of the mains voltage. The TL494 PWM chip cannot be used as a PFC controller because it does not have the ability to track the mains voltage and cannot do current-mode control. There is a very wide selection of controllers that can be used to drive a PFC. They range from relatively simple to very complex designs and they vary widely in price also. The UCC28019 and the NCP1654 controllers are both 8-pin devices that are quite simple to design a PFC around.

    The UCC28019 operates at 65KHz and the datasheet provides all of the calculations so that you can design to whatever power level you need and there is also an example design to explain how to use the calculations.
    The NCP1654 is available in 65KHz, 133KHz, and 200KHz versions. The datasheet for this chip also provides all of the information you need to do the calculations and it also shows an example design and example calculations.

    I've personally used the NCP1654 in a PFC stage and the calculations that they provide work great and it is fairly easy to get it working as long as you follow the design procedures outlined in the datasheet. Both of these chips are very, very similar though, and I imagine the UCC28019 is equally easy to use.

    - Brad

  4. #324
    diysmps Senior Member
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    Quote Originally Posted by blasphemy000 View Post
    That is not a PFC stage. That is just a high voltage boost converter with voltage regulation and no current limit protection. That circuit has 940uF of bulk capacitance after the rectifier, where as a PFC converter usually uses somewhere around 1uF or less, so that the input voltage to the boost inductor is able to track the sine wave of the mains voltage. The TL494 PWM chip cannot be used as a PFC controller because it does not have the ability to track the mains voltage and cannot do current-mode control. There is a very wide selection of controllers that can be used to drive a PFC. They range from relatively simple to very complex designs and they vary widely in price also. The UCC28019 and the NCP1654 controllers are both 8-pin devices that are quite simple to design a PFC around.

    The UCC28019 operates at 65KHz and the datasheet provides all of the calculations so that you can design to whatever power level you need and there is also an example design to explain how to use the calculations.
    The NCP1654 is available in 65KHz, 133KHz, and 200KHz versions. The datasheet for this chip also provides all of the information you need to do the calculations and it also shows an example design and example calculations.

    I've personally used the NCP1654 in a PFC stage and the calculations that they provide work great and it is fairly easy to get it working as long as you follow the design procedures outlined in the datasheet. Both of these chips are very, very similar though, and I imagine the UCC28019 is equally easy to use.

    - Brad
    it seems like very good information, can you just give a picture with v out 320vdc

  5. #325
    Not at this time, no. The datasheet provides all of the math required to design a PFC stage. My PFC stage is part of a much larger project that I don't want to release until the rest of the project is done. My output voltage is 390V and it's rated for 10 to 12KW. My topology isn't really going to be useful for the kind of supply in this thread.

    - Brad

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