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Old 21st June 2012, 11:05 AM   #11
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Join Date: Feb 2008
Location: Jackson,michigan
I can now see the schematics.
Are you familiar with the operation of the TL494 ?

Here are some data sheets and application notes that will help you,

http://www.ti.com/lit/ds/symlink/tl494.pdf

http://www.ti.com/lit/an/slva001e/slva001e.pdf

http://www.onsemi.com/pub_link/Collateral/AN983-D.PDF

http://www.onsemi.com/pub_link/Collateral/TL494-D.PDF

http://bbs.dianyuan.com/bbs/u/30/1120101537.pdf

I know it seems complicated as it took me a while to understand switching supplies, But they really are easy once you understand what is going on.

The output pins of the chip are more suited for BJT's so a driver circuit for FET's is the best way to go to insure a complete turn off state of the device at high frequency's.

I found this out when I was designing my HV variable supply for ESL's.
I found that the npn/pnp bjt configuration worked the best as I was designing for a 100Khz to 200Khz range.

But, There are driver chips that are designed to do this and requires little too no extra parts.
Such as the IRF 2111 Series of driver chips (IRF211x).

http://www.irf.com/product-info/data...ata/ir2110.pdf

http://www.irf.com/product-info/data...ata/ir2111.pdf

http://www.irf.com/product-info/data...ata/ir2112.pdf

http://www.irf.com/technical-info/appnotes/an-978.pdf

http://www.irf.com/technical-info/appnotes/an-1108.pdf

I didn't have any so I just used BJT's instead.
I started off with a single FET driven off of a 555 timer but I had to add the BJT buffer stage in order for it to switch properly.
Then I added a driver transformer for the push pull setup.
This can be done as well but the TL494 already has a complementary output so it is not needed, Just the drivers are.

My power supply can be found here just for reference of the driver configuration,

how can test the stator insulation and mylar coating?

how can test the stator insulation and mylar coating?

how can test the stator insulation and mylar coating?

how can test the stator insulation and mylar coating?

The concept of driving the FET's is the same although I did not use PWM in my design.
I originally wanted too, But it didn't turn out that way for that project.
But getting the FET's to properly switch was quite a learning experience for me.

As far as the transformer goes the ETD39 that you have should work just fine as discussed.
If you want to use a larger core then a different number of primary turns might need to be used in order to have a good efficient design.

However using the same amount of turns on a larger core is not an issue unless you lower its frequency of operation, Only then core saturation will become an issue and you will have to increase the number of primary turn to avoid this.
But also using a larger core will allow you a lesser amount of primary turns for the same frequency as this will allow you to use a heavier gauge conductor for the secondary as winding space allows.
This where the juggling of wire size and winding space vs current capability becomes an issue.

This is something that many other members are more qualified to help you with as switching transformers is a new area for me, But the basics are the same as for regular transformers and those I know fairly well.

This is a thread that I started to follow but I haven't read all of it yet, But it has to do with a ground up design of a switching supply transformer and should be very informative if you are planning on using a bigger core or for checking the design with the cores that you have already,

Ferrite core transformer design step by step

As well as many many useful threads in this forum pertaining to exactly what you are trying to do.

I hope this help you.

jer

Last edited by geraldfryjr; 21st June 2012 at 11:17 AM.
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Old 21st June 2012, 03:18 PM   #12
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Join Date: Jun 2010
i love your peopel and your country
tecnologhy... wooow
thanks so much dear friend
i try to do
thanks for geving your time to me
sorry for my bad english
i must use TL494 and IRFZ44N only
i can by other core like ETD54 or ETD59
thank you dear friend
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Old 21st June 2012, 03:42 PM   #13
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Join Date: Feb 2008
Location: Jackson,michigan
No problem, This is what our little DIYAudio community is all about !!!

jer
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Old 21st June 2012, 06:49 PM   #14
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Quote:
Originally Posted by geraldfryjr View Post
No problem, This is what our little DIYAudio community is all about !!!

jer
i want try this one
is it ok in shematic?
Attached Images
File Type: jpg car_smps_devre_semasi_2.jpg (46.0 KB, 191 views)

Last edited by Hadighorbani; 21st June 2012 at 06:52 PM.
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Old 21st June 2012, 10:02 PM   #15
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Join Date: Feb 2008
Location: Jackson,michigan
I think it looks fine.
I haven't translated the PDF yet but I believe it says something about using 4 FET's for a 300 watt range.
This I would consider doing as a safety measure anyhow.
In order to get the voltage range you want you just need to adjust the secondary winding turns is all because the voltage correction feedback is taken off of the primary side.
I you can add a trimmer Pot. in that loop for a voltage adjustment as well.
I will look over the schematic and let you know know were it should go.

jer
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Old 22nd June 2012, 02:22 AM   #16
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Join Date: Jun 2010
Quote:
Originally Posted by geraldfryjr View Post
I think it looks fine.
I haven't translated the PDF yet but I believe it says something about using 4 FET's for a 300 watt range.
This I would consider doing as a safety measure anyhow.
In order to get the voltage range you want you just need to adjust the secondary winding turns is all because the voltage correction feedback is taken off of the primary side.
I you can add a trimmer Pot. in that loop for a voltage adjustment as well.
I will look over the schematic and let you know know were it should go.

jer
Hi
please show me in photo weher can i ad a trimmer pot to adjustment voltage.
that have a pot. what is that?
thanks
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Old 22nd June 2012, 02:32 AM   #17
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can i use shotky ultra fast diod in out put of core for rectifier?
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Old 22nd June 2012, 05:49 AM   #18
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Join Date: Feb 2008
Location: Jackson,michigan
Yes, You can use them if you like.
As long as you use at least fast types you are okay.
I used regular diodes in my HV Supply at at over 100khz and got away with it but I do suffer much more losses due to the slow turn off time.
I used them because it was all I had and I found that they did work for my application as I don't need to pull any heavy currents from the supply.

Had I any UF4007's I would gladly have used them.

Yes, I will go over the circuit and determine the trimmer for you.

Jer
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Old 22nd June 2012, 07:47 AM   #19
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My diod is STTA806DI and DSSK60-0045A
Is that ok?
Thanks
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Old 22nd June 2012, 10:45 AM   #20
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Join Date: Feb 2008
Location: Jackson,michigan
Yes ,those are very nice diodes !!

http://www.st.com/internet/com/TECHN...CD00000746.pdf

However this one is rated at 45v but should be quite suitable for your application at 25v,

http://ixdev.ixys.com/DataSheet/l131.pdf

jer

Last edited by geraldfryjr; 22nd June 2012 at 10:49 AM.
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