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PICList Thread
'PIC-Based Bench Power Supply'
1999\11\17@172135 by Sean Breheny

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Hi all,

FINALLY I have put up a page about my PIC-Based Bench Power Supply project.
I finished the project a while ago,and only got around to documenting it
now. The schematics and pictures are up, but the current version of the
code will take me a few more days to post on my page.

The basic idea was to build a positive/negative adjustable voltage bench
power supply capable of handling a decent amount of current (at least 2 or
3 amps) and have the voltage read out on an LCD display by, what else?, a
PIC16C71.

If you are interested, please take a look at:

http://www.people.cornell.edu/pages/shb7/ps.html

and give me some comments.

I couldn't have done this without the help of the PICLIST. The PICLIST is
STILL the best technical listserv on the net. Specifically, I want to thank

Mike Keitz
Fr. Tom McGahee
Paul Webster

for answering my questions about this project. If I missed anyone, thanks,
and please accept my apology.

Sean



|
| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
\--------------=----------------
Save lives, please look at http://www.all.org
Personal page: http://www.people.cornell.edu/pages/shb7
spam_OUTshb7TakeThisOuTspamcornell.edu ICQ #: 3329174

1999\11\18@171836 by Lawrence Lile

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Sean, I've been thinking about a PIC based power supply for years.  I'll be
interested to see how you did it.  Maybe I'll build one.

-- Lawrence Lile


{Original Message removed}

1999\11\18@175432 by Sean Breheny

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Hi Lawrence,

Great! I suppose I should warn you,though, that the PIC doesn't CONTROL the
voltage, it just measures it. It is a traditional dual linear regulated
supply with a 16C71 and an LCD added to monitor the voltage.

Perhaps it would have been better to go with a switching supply, but I had
already started the linear regulator design when peopl suggested it.

Sean

At 04:17 PM 11/18/99 -0600, you wrote:
>Sean, I've been thinking about a PIC based power supply for years.  I'll be
>interested to see how you did it.  Maybe I'll build one.
>
>-- Lawrence Lile
>
>

|
| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
\--------------=----------------
Save lives, please look at http://www.all.org
Personal page: http://www.people.cornell.edu/pages/shb7
.....shb7KILLspamspam@spam@cornell.edu ICQ #: 3329174

1999\11\18@183518 by Mike M

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>I should warn you,though, that the PIC doesn't CONTROL
> the voltage, it just measures it.

So basically its the voltage measuring part of a digital multimeter.  Ever think
or anyone ever try to build a signal generator using a PIC?

On Thu, 18 Nov 1999 17:53:34 -0500 Sean Breheny .<shb7spamKILLspamCORNELL.EDU> wrote:
{Quote hidden}

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1999\11\18@184757 by Quitt, Walter

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SURE!

First off: We make specilized precision Welding equipment
http://www.microjoin.com
which are really special power supplies.

That's (basically) what I did.  Creating an arbitary
waveform based on an interrupt driven state machine.
I suppose you could use an internal ADC.  But I used
an external 14 bit Burr-Brown device with a 4 bit
parallel interface.

Using a PIC with lotsa I/O and running up around 30MHZ,
you really need almost no glue.  My update rate is
40us.  Was shorter but since we control a machine
there is more I/O to handle than just generating
a waveform.

You can write a waveform generator in easy
enough.  Just getting the state machine info
into is the hard part.

GL,
Walt....

{Original Message removed}

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