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Thread: 1000w smps based on LUDO3232

  1. #371
    .... Silvio's Avatar
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    Quote Originally Posted by vuhotay View Post
    Hello Mr/Ms Silvio!
    Thank you for your circuit.
    But I wonder how feedback signal work?
    Thank you!
    If you are referring to my schematic with SG3525 and IR2110
    The feedback works by taking a sample of the output voltage which is compared with the reference voltage of the TL431. When the voltage of the output goes higher the led inside the opto coupler will light up and switching the photo transistor inside the opto and this in turn switches pin 1 of the sg3525 to ground thus reducing the pulse width hence also the output voltage. A balance is maintained so that the output voltage remains constant.

    The 33v zener is there because the TL431 cannot take more voltage than this. As you can see from the schematic the output voltage is much higher (more than 100v).

  2. #372
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    Thank you sir!
    I am very worry before going to page 19 and I see your v2 version and I see your feedback circuit.
    Thank you!

  3. #373
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    Hello Mr Silvo!
    I did your project and I have some problems with output voltage. Max voltage I got is 73v with no feedback. And I test on 150W light the voltage down to 68v. I have no more light to reach 1000W. But i wonder does IR2110 have auto feedback? And how do you think about being can not get more voltage? although I set to 97% of pwm.
    Hope your reply!

  4. #374
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    Quote Originally Posted by vuhotay View Post
    Hello Mr Silvo!
    I did your project and I have some problems with output voltage. Max voltage I got is 73v with no feedback. And I test on 150W light the voltage down to 68v. I have no more light to reach 1000W. But i wonder does IR2110 have auto feedback? And how do you think about being can not get more voltage? although I set to 97% of pwm.
    Hope your reply!
    About the output voltage it depends on the turns in the transformer Pri and secondary and also the input AC voltage.
    The smps is not regulated and has no feedback. The output voltage will sag a little with load.

    Please tell me what you did in the transformer turns and also measure your input ac voltage.

    If you are using ETD49 transformer then the turns should be 18 turns for primary and 9-0-9 turns for secondary. You will only get 80v-0-80v if the input voltage is 240vac with less the output voltage will be less.

    You will get voltage drop with load at a maximum of 10 to 15% depending on the value of input capacitance and also how good you wind the transformer. If you are going to use the unregulated version then you will not need output inductor. Short out the place where the inductor should be with a piece of copper wire and solder it. The inductor will create voltage drop

    Send some photos so we can see what you did.
    Last edited by Silvio; 04-06-2019 at 11:34 PM.

  5. #375
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    Quote Originally Posted by vuhotay View Post
    Thank you sir!
    I am very worry before going to page 19 and I see your v2 version and I see your feedback circuit.
    Thank you!
    Regarding the feed back circuit well you have to include the output inductor otherwise it will not work. The output voltage will be set to around 60v do not try to go higher as there is not enough headroom in the output to sustain it.

  6. #376
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    I tested these ones on the picture and the more turn inductor be wraped the more drop voltage are. And I think I am wrong with transformer. I did 29 turns for pri and 7-0-7 for sec on EE49 core. I will rebuilt and send feedback to you!20190407_085855.jpg
    Last edited by vuhotay; 04-07-2019 at 02:40 AM.

  7. #377
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    What type of transformer do you actually have is it an ETD or EE type?
    What output voltage do you need?

  8. #378
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    I used a grinding CRT TV flyback transformer. I didn't know that is ETD or EE core. I set the primary for 18 turns and 2 mosfets are blow up. although with 29 turns everything did well. Today I will rebuilt a new PCB and do it again!
    Please tell me what is difference between ETD and EE core?

  9. #379
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    You can search the internet to see what is an ETD and EE core.

    I suggest you see this video before trying to wind the transformer. link below

    https://www.youtube.com/watch?v=TLD6hUV64YU&t=1s

    See also this video to help you understand what you should do to wind a safe transformer,

    https://www.youtube.com/watch?v=_K3ixhcTYFg&t=1s

    You are doing this at your own risk and I am not responsible in any way.

    remember that the mains voltage is deadly and if you electrocute yourself it may be fatal and you die.

    read the SMPS warnings at the top bar of the page.
    Last edited by Silvio; 04-09-2019 at 12:31 PM.

  10. #380
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    hi mr silvio

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