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Sonsivri > Electronics > Projects (Moderators: bbarney, pickit2) > (REQ) Constant Current Circuits 15A
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carlos789
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« on: June 22, 2009, 12:17:27 00:17 »
I need to make a source Constant Current, to unload a battery of 12 VDC to constant current. And that can be modified by means of a micro . Today use several LM338 in parallel.
Very Thanks
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diaz
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« Reply #1 on: June 22, 2009, 12:30:35 00:30 »
Found this on the RcGroups forum. The original thread was http://www.rcgroups.com/forums/showthread.php?t=367023 but Uitgeslapen has edited his post to remove the schematic, god knows why !

It works very well provided you can keep the MOSFET cool.
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oldvan
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« Reply #2 on: June 25, 2009, 07:31:44 07:31 »
I'd accomplish this using a PIC PWM circuit driving a power FET and a load resistor.

ADC to measure current (or measure battery voltage and calculate current),
adjust duty cycle accordingly.
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carlos789
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« Reply #3 on: June 29, 2009, 01:34:58 01:34 »
Diaz:
Thanks for the circuit, but this it does not work like Source of Current.
Oldvan:
I implement it and I inform soon it, thanks.
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« Reply #4 on: June 30, 2009, 12:20:57 00:20 »
hi carlos789,

I got it from programmer_100, here is the link
http://rapidshare.com/files/132280810/Constant_high_current_source.rar.html
You can modity it for higher current.
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