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Sonsivri > Electronics > General Electronics (Moderators: o2, pickit2) > Microcontroller based variable power supply
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andig
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« on: November 03, 2006, 04:32:43 16:32 »
Hi Everybody,

I am looking for a microcontroller (preferrably a PIC) power supply circuit. I have built one using the PWM as the vref and an op-amp to control the loop of a LM317. Problems are that for the supply to go down to zero volts I need to use a negative supply. This exceeds the total supply for the op-amp. For a 0-30 volts range I need an op-amp with supply levels as high as 40 volts. Nothing available in our market also rail-to-rail are unavailable. So sticking to a LM358. Tried to use a buffer at the output then the load regulation is poor. Any guidence would be of great help

Regards

SD
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Gruber
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« Reply #1 on: November 03, 2006, 05:11:28 17:11 »
Hi andig

Right stuff for you is OPA445 from Ti.
 WIDE-POWER SUPPLY RANGE: ±10V to ±45V

Look PDF, FIGURE 10. Programmable Voltage Source.
VO = 0 to +50V
at 10mA

regards
Gruber
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andig
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« Reply #2 on: November 04, 2006, 06:25:35 18:25 »
Hi,

Thanks for the suggestion but again it is not available in our market Cry. May be I can get it from somewhere else.

Regards
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sohel
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« Reply #3 on: December 10, 2006, 07:40:59 19:40 »
u may download epe 2000 & 2001 . here u will find ok

thanks Cry
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bbarney
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Uhm? where did pickit put my mute button
« Reply #4 on: December 17, 2006, 01:22:32 01:22 »
http://rapidshare.com/files/7799096/Powersupply_complete.rar.html
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andig
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« Reply #5 on: February 08, 2007, 05:49:13 17:49 »
Thanks bbarney. I am sorry I did not notice your post earlier. Seems the forum does not notify by email on new replies. Or may be caught on the spam filter. Thanks any way.

Regards
andig
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Kabron
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« Reply #6 on: February 10, 2007, 08:44:56 08:44 »
I'd allready done one: Mouse Controlled Pulse Power Supply
http://kabron.nm.ru.
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BRANCA
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« Reply #7 on: February 12, 2007, 02:57:44 14:57 »
  What is the source,description,of power supply [archive from rapidshare]?
  It looks interesting,but I can't view the LYT files.Which is the prog for reading?
  Are this programed in pic basic?
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Lumos
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« Reply #8 on: February 13, 2007, 08:20:30 08:20 »
Hi Branca

the LYT files are PCB files of Proteus.
The program is written in Proton BASIC.

best regards
Lumos
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BRANCA
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« Reply #9 on: February 13, 2007, 11:43:40 11:43 »
Oka!Thanks Lumnos!I installed Proteus 6.9 and Proton SE 3.0.Now I can see all files.
Sorry about not seing old post on this topic.I saw somebody used PIC 16F877 instead of PIC 18F....I'm not so sure the migrating conversion can be done so easy.I/m interested in this cause I owned PIC 16F876A.
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