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Thread: 1000w smps based on LUDO3232

  1. #421
    .... Silvio's Avatar
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    I think you will be better off using 2 X ir2110 instead of gate drive. A gate drive transformer is a delicate thing to do and it has to be symmetrical in all ways with the 5 windings. It also needs to have a high permeability core other wise you will have to do a lot of turns to get to the right inductance. One other thing I want to mention is that if you load the sg3525 more than necessary the wave form starts to deform. On the other hand with IR2110 the wave form comes out nice and clean. For isolation the GDT is better. I guess for a first experience it would be better to start first with IR2110.
    I experimented with gate drive transformer and what I told is from my experience.

  2. #422
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    Quote Originally Posted by Silvio View Post
    I think you will be better off using 2 X ir2110 instead of gate drive. A gate drive transformer is a delicate thing to do and it has to be symmetrical in all ways with the 5 windings. It also needs to have a high permeability core other wise you will have to do a lot of turns to get to the right inductance. One other thing I want to mention is that if you load the sg3525 more than necessary the wave form starts to deform. On the other hand with IR2110 the wave form comes out nice and clean. For isolation the GDT is better. I guess for a first experience it would be better to start first with IR2110.
    I experimented with gate drive transformer and what I told is from my experience.
    i have used gdt with very good success , always used small e:e cores , moved away from using ir2110 because of failure, ir2110 always burnt and are expensive to replace . but thats my experience

  3. #423
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    Quote Originally Posted by Silvio View Post
    I think you will be better off using 2 X ir2110 instead of gate drive. A gate drive transformer is a delicate thing to do and it has to be symmetrical in all ways with the 5 windings. It also needs to have a high permeability core other wise you will have to do a lot of turns to get to the right inductance. One other thing I want to mention is that if you load the sg3525 more than necessary the wave form starts to deform. On the other hand with IR2110 the wave form comes out nice and clean. For isolation the GDT is better. I guess for a first experience it would be better to start first with IR2110.
    I experimented with gate drive transformer and what I told is from my experience.
    i have used gdt with very good success , always used small e:e cores , moved away from using ir2110 because when smps output failed the ir2110 always burnt and are expensive to replace . but thats my experience

  4. #424
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    Quote Originally Posted by stewin View Post
    i have used gdt with very good success , always used small e:e cores , moved away from using ir2110 because when smps output failed the ir2110 always burnt and are expensive to replace . but thats my experience
    Hi Stewin, well using EE transformers brings the need to use ecw. Isolation is not so good at 320v, I am saying this is that usually when mosfets blow they tend to short out the gate with the source and drain. If the smps is not short circuit protected then there will be danger of the input DC voltage shorting out with the control circuit leading to a catastrophic damage. For a gate drive trafo I would rather use a small toroid around 15 to 20mm dia and using insulated wire. This will make a better trafo more safe and more symmetrical. The wave form needs to be nice and clean at all times especially on heavy load. My experience with these gate drive trafo is that the the SG3525 must not be loaded. I had a current booster made up of BD140 and BD139 after the SG but when loading the output of the GDT to about 1A the wave form from the SG3525 was not so pretty. It had an overshoot on the rising edge. I tried to tame it as much as I could but I could not get rid of it completely.
    Regarding IR2110 I did get some from aliexpress and they where quite cheap. I tried them out and they all worked satisfactory.

  5. #425
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    Quote Originally Posted by Silvio View Post
    Hi Stewin, well using EE transformers brings the need to use ecw. Isolation is not so good at 320v, I am saying this is that usually when mosfets blow they tend to short out the gate with the source and drain. If the smps is not short circuit protected then there will be danger of the input DC voltage shorting out with the control circuit leading to a catastrophic damage. For a gate drive trafo I would rather use a small toroid around 15 to 20mm dia and using insulated wire. This will make a better trafo more safe and more symmetrical. The wave form needs to be nice and clean at all times especially on heavy load. My experience with these gate drive trafo is that the the SG3525 must not be loaded. I had a current booster made up of BD140 and BD139 after the SG but when loading the output of the GDT to about 1A the wave form from the SG3525 was not so pretty. It had an overshoot on the rising edge. I tried to tame it as much as I could but I could not get rid of it completely.
    Regarding IR2110 I did get some from aliexpress and they where quite cheap. I tried them out and they all worked satisfactory.
    hi silvio thanks for the reply ,very useful info and thanks for sharing your experience . even though i still have phobia of using ir ic as gdt,i will revisit it.
    but i have to have many ir2110 as spare , cause when amp fails , the smps also fails ; leading to gdt, i.e ir 2110 failing.

  6. #426
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    Quote Originally Posted by stewin View Post
    hi silvio thanks for the reply ,very useful info and thanks for sharing your experience . even though i still have phobia of using ir ic as gdt,i will revisit it.
    but i have to have many ir2110 as spare , cause when amp fails , the smps also fails ; leading to gdt, i.e ir 2110 failing.
    Hi Stewin, Well as far as the smps is concerned this must have a good working short circuit protection. It must sense both high and low side pulses. The one from Ludo is a good example of this. The only mishap is that it latches and you have to switch off for it to come on again.

    I am working on a HB smps which is LLC and the protection is self resetting. This will give me a chance for a good output capacitance value especially on start up. I am using an EE55 and my hopes are for 2000w continuous and 2500w on peak. I still have to wait for some more parts to come. I just finished the pcb etching and drilling and fitting the heat sinks. The main oscillator and protection is on a separate pin header. This makes it more compact and also ease of repair in the event of failure. I also got the auxiliary smps on a pin header. This was published here a month or so ago.

    The input capacitance is 4 caps @ 680uF X 450v this gives 2700uf across the 320v rail. The output voltage is to be around 85-0-85 and a capacitance of 5000uf on each leg of the output rail. it also include a double regulated 15v rail for preamp and a heat regulated fan speed control for 3 X 80mm 12v fans. Thermal protection is also included. The only thing that it does not have is that the fan motors will stop on thermal overload as these are powered by the main transformer and not from an auxiliary supply.

    here is a pic of my work so far for the prototype

    DIYsmps 2000.JPG

  7. #427
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    Quote Originally Posted by Silvio View Post
    Hi Stewin, Well as far as the smps is concerned this must have a good working short circuit protection. It must sense both high and low side pulses. The one from Ludo is a good example of this. The only mishap is that it latches and you have to switch off for it to come on again.

    I am working on a HB smps which is LLC and the protection is self resetting. This will give me a chance for a good output capacitance value especially on start up. I am using an EE55 and my hopes are for 2000w continuous and 2500w on peak. I still have to wait for some more parts to come. I just finished the pcb etching and drilling and fitting the heat sinks. The main oscillator and protection is on a separate pin header. This makes it more compact and also ease of repair in the event of failure. I also got the auxiliary smps on a pin header. This was published here a month or so ago.

    The input capacitance is 4 caps @ 680uF X 450v this gives 2700uf across the 320v rail. The output voltage is to be around 85-0-85 and a capacitance of 5000uf on each leg of the output rail. it also include a double regulated 15v rail for preamp and a heat regulated fan speed control for 3 X 80mm 12v fans. Thermal protection is also included. The only thing that it does not have is that the fan motors will stop on thermal overload as these are powered by the main transformer and not from an auxiliary supply.

    here is a pic of my work so far for the prototype

    DIYsmps 2000.JPG

    very lovely and nice layout , after assembling it please post pictures and results.

  8. #428
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    This link below is my project base on Mr. Silvio LuDo 3232 by changing to TL494
    I'm doing well, plz show me and everyone the mistake to get better. Thanks!
    https://drive.google.com/file/d/1gcl...ew?usp=sharing

  9. #429
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    I cannot see your schematic something is wrong with the link.

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