Thanks guys!
Almost to much information to handle!!

Roman, if I could trouble you to draw a simple cct of what you are
proposing I will whip it up and throw some software at it, then
measure what happens :)
(although it want be a PIC micro.. Mitsubishi M16C62 micro)

In the main software I actually put the complete circuit to sleep
for 30seconds to drop to lowest power consumption modes. So not
sure how I will cope with the PWM in the final version without
another pwm generator of some type.

Cheers!
Peter Mcalpine

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Roman Black
Sent: Monday, 20 January 2003 11:25 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: Solar charging of batteries


Peter L. Peres wrote:
>
> I will not argue semantics with you Roman. But I would like to see a
> converter built according to your logic work. The part about 'changing
> input current until maximum output current is reached' might work,
> assuming that this cannot lead to control loop latchup. I think that what
> you are doing is in the right direction, especially with Spehro's
> comments. I was simply proposing to chop the input and output. You propose
> modulating the input so a synchronous detection of the output modulation
> allows feedback in the correct direction. That is 'less brutal' chopping I
> think.


Well actually I was proposing modulating the "middle"
so that both the input and outputs see a nice smooth
DC current.

I think you have a point with the control loop issue,
the PIC would need to do some error checking but there
should be plenty of processing power available. A
simple dithering up and down (say) 2% each side of max
output current would work provided it was faster than
the rate of change of the solar conditions.

I seem to have missed Spehro's post??
-Roman

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