Variable 10-14Volt 10-15A BUCK requlator - diyAudio
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Old 17th May 2006, 08:05 AM   #1
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Default Variable 10-14Volt 10-15A BUCK requlator

Designing a Variable 10-14Volt 10-15A BUCK requlator
Application: Lead acid battery charger/HAM psu
TL494 PWM o/p volts and current limit>> high side driver > high side n-ch power mosfet Z44/48 high current torroid inductor/ fast recovery diode...
all inputs welcome...
thanks
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Old 17th May 2006, 08:35 AM   #2
Electrons are yellow and more is better!
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You haven't consider to buy a dirt cheap charger if the main purpose was to get the battery charged?
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Old 17th May 2006, 11:33 AM   #3
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Need a highly efficient charger..no Thyristor or linear...
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Old 17th May 2006, 11:57 AM   #4
Electrons are yellow and more is better!
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Yes, but many of the dirt cheap from China is pretty effecient. A linear charger is hardly effecient if I mean the same thing as you.

I just checked at www.biltema.se and 9 A charger for 30 USD, 5 A for 20 USD!

It's called "Batteriladdare" if you want to check, only in swedish though. I'm pretty sure you can get a decent charger in India.
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Old 17th May 2006, 12:23 PM   #5
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I wish to DIY...
looking for a high side driver for the MOSFET..even though i have IR2110 i don't want to waste it (the low side driver will not be utilised.)...
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Old 17th May 2006, 12:30 PM   #6
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and i have most of the stuff lying ..2 inch torroids,power transformers,metal cabinets..etc...etc..and will be in junk soonf i am not using these anyway...
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Old 18th May 2006, 04:59 PM   #7
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step 1:
crude schematic: how to make it w/o high side drivers
Attached Images
File Type: jpg buck conv.jpg (45.1 KB, 194 views)
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Old 18th May 2006, 05:06 PM   #8
Danko is offline Danko  Hungary
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I'm experimenting with a 12V Lead-acid battery charger, for 20A. I can send the final schematic, when I'm finished. This is a constant current schematic, based on LM2574-ADJ. This is a 0.5A DIP-8 packaged device. I "boosted" the current with a 80A "cute" MOSFET :-)

After that I will have to make a 2-12 (of 2-15V) supply, for about 15A, for powering a few stepper motors. I don't know, how will I make that. Maybe I will use LM2574-ADJ, and some current-boost MOSFET, but this LMxxxx IC can operate only at a fixed, 52kHz frequency, so I will need quite big output choke.
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Old 19th May 2006, 02:31 AM   #9
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....but u need to limit current to C/10 or better C/20..right ?
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Old 19th May 2006, 04:32 AM   #10
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Are you driving this from mains voltage??

If you are, you have a good desgin for killing people (or things)
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