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Title: Microcontroller based variable power supply Post by: andig 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 Title: Re: Microcontroller based variable power supply Post by: Gruber 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 Title: Re: Microcontroller based variable power supply Post by: andig on November 04, 2006, 06:25:35 18:25 Hi,
Thanks for the suggestion but again it is not available in our market :'(. May be I can get it from somewhere else. Regards Title: Re: Microcontroller based variable power supply Post by: sohel on December 10, 2006, 07:40:59 19:40 u may download epe 2000 & 2001 . here u will find ok
thanks :'( Title: Re: Microcontroller based variable power supply Post by: bbarney on December 17, 2006, 01:22:32 01:22 http://rapidshare.com/files/7799096/Powersupply_complete.rar.html
Title: Re: Microcontroller based variable power supply Post by: andig 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 Title: Re: Microcontroller based variable power supply Post by: Kabron on February 10, 2007, 08:44:56 08:44 I'd allready done one: Mouse Controlled Pulse Power Supply
http://kabron.nm.ru. Title: Re: Microcontroller based variable power supply Post by: BRANCA 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? Title: Re: Microcontroller based variable power supply Post by: Lumos 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 Title: Re: Microcontroller based variable power supply Post by: BRANCA 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. |