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Thread: Audio smps 700w (IR2153)

  1. #91
    .... Silvio's Avatar
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    Quote Originally Posted by xuantunt View Post
    How to set the power limit to work correctly. For example I want to limit it to 1000W, what must I change on the circuit? Thanks a lot.
    It depends on which power supply are you referring to; Is it the 700w smps or the 1000w? The 700w smps has a current limiter and not a short circuit protection. The 1000w smps uses a current transformer and a voltage comparator to accurately shut down in the event of over current or short circuit.

  2. #92
    Quote Originally Posted by Silvio View Post
    It depends on which power supply are you referring to; Is it the 700w smps or the 1000w? The 700w smps has a current limiter and not a short circuit protection. The 1000w smps uses a current transformer and a voltage comparator to accurately shut down in the event of over current or short circuit.
    Thank you for your reply. My 1000W kit has been revised according to your 700W prototype. I use fet 460 and EC42 transformer. I use sub-board 5401 and 5551, protect against short-circuiting very well. Overload protection does not work. I want to know if there is any way to use both?

  3. #93
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    Hi I do not think you can use both. It will be either short circuit protection and the power supply will stop. You have to switch off and wait for the bulk capacitor to discharge then switch on again for reset. It will be better if you use a current transformer for short circuit protection. If you used my pcb then you have space for it. See attached fig below

    current trafo 700w.JPG

    EE42 transformer I dont think is large enough for 1000w. There are two types of EE42 one is 42/21/15 and the other 42/21/20. The first one has a maximum power of just over 1000w at 65kHz and the thicker one is just 1300w. You are a little bit limited here as the cores are very close to the wanted power and they may saturate. I suggest you will use ETD49 core which is more suitable for this power

    The first prototype of my smps uses a current limiter. This also create a soft start for the secondary capacitors to charge up. Unfortunately it does not work for short circuit. The IR2153 does not have soft start and there need to be another way to charge up the secondary capacitors and even to cater for when starting the smps on load

    The IR2153 may not have enough drive current to switch IRFP460 (only 180mA) and at least you will need some kind of arrangement to boost up the drive and discharge current. You will need at least 1 to 1.5 amps to drive IRFP460 properly. Do not be fooled if it works on light load as when it comes to heavy current the fets will need a good drive and if they dont find it they may heat up and explode.

    You will also need a better auxiliary current and also a better start up circuit. The way this circuit is configured is not suitable for more power. I guess you will be better off making Ludo's version for 1000w
    Last edited by Silvio; 05-10-2019 at 04:17 AM.

  4. #94
    Thank you for the quick reply. Maybe I need to develop version over 2kw at another prototype. With your prototype I used electronic load to test over 1200W within minutes.

  5. #95
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    Quote Originally Posted by xuantunt View Post
    Thank you for the quick reply. Maybe I need to develop version over 2kw at another prototype. With your prototype I used electronic load to test over 1200W within minutes.
    Be careful when using electronic load as no matter how much the voltage drops the load stays the same.

    If you want to build a 1000w smps then there is mine and also ludo's. This power supply has been built by a lot of DIY ers and it proves it works well. My smps can work 900w continuous and 1200w peak. It is now fitted in a 1000w amplifier.

  6. #96
    Help me fix this problem. Since I designed the buffer for 2153 with BD140, I have lost the anti-convolution function before powering. I tested it several times by giving it a short delay and then powering, FET or some other components will explode after 1-2s. Short-circuiting after power supply is still working normally. It took me more than 2 days but I didn't find a reason to fix it. If you know how to ask or help me know why and how to make it work normally. Thank you very much
    3.JPG

  7. #97
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    Well that is your problem my 550w smps with 700w peak is not meant to work for a 1000w. The whole set up has to be different. My smps was tailor made and I spent many hours trying to perfect it to work correctly. I post here for personal use and not for making profit. Well I am sure you will find a way of making it work.

    Xuantunt.JPG

  8. #98
    I'm quite surprised when you find that product. It took me a long time to redraw according to your principles, I distributed it in my country. Does that bother you?
    Last edited by xuantunt; 05-12-2019 at 04:23 PM.

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