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'[EE]: [PIC]:Monitor battery string with PIC?'
2000\08\09@075929 by Bob Ammerman

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I am assuming these are _big_ cells, and that we could draw a few milliamps
from them without trouble.

How about using a V/F chip at each cell, powered locally by the cell itself
(with  a DC->DC converter).

If local powering isn't acceptable, then they could each be powered by an
isolated DC->DC converter from a common bus (tho' watch the isolation
voltage of the converter, 600V is a bit on the high side).

Optoisolate all of the V/F outputs and run them in groups to a small PIC
based data acquisition box with maybe 5 to 20 inputs that scans all the
locally connected cells and responds to polls (via RS485?) from a master.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level code)

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2000\08\09@095738 by Andy Jancura

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Hi Ed,

my suggest its similar to Bobs. But I would design small "self powered"
modules with 12c672, HFBR1523 and 8pin ADs for each battery cell. "Self
powered" I mean, the supply will be the battery cell, voltage dividers and
zener diode.

Advantage:
1) using fibre optolink gives the best possible isolation
2) possibility to change the resolution from 8 to 24bits
3) digital output

Problems:
1) gettting down the High Voltage from cell
2) eliminating noise from resistor-dividers at better resolutions

I have done something like this with 16 bit resolution and have in plane to
make this small as possible. Like a Tic-Tac box (of course without
dividers).


Andrej

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2000\08\09@101028 by Bob Ammerman

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What is nominal cell voltage?

What resolution do you need?

What is polling rate?

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

{Original Message removed}

2000\08\09@110534 by Andy Jancura

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>What is nominal cell voltage?

I'm not sure, may be 100-250V.

>What resolution do you need?
>
>What is polling rate?

I don't know. Ed doesn't mention this.


Andrej

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2000\08\09@111121 by Andrew Kunz

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More likely, cell voltage is 2V or 12V (or some interval between them).  String
voltage is 100-250V (ie, 8-20 12V batteries in series).

Sounds like telcom backup equipment.  Wish I could help, but that's where I'm
living right now!

Andy










Andy Jancura <.....andy_jancuraKILLspamspam.....HOTMAIL.COM> on 08/09/2000 01:03:43 PM

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Subject: Re: [EE]: [PIC]:Monitor battery string with PIC?








>What is nominal cell voltage?

I'm not sure, may be 100-250V.

>What resolution do you need?
>
>What is polling rate?

I don't know. Ed doesn't mention this.


Andrej

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2000\08\09@120933 by Bob Ammerman

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I thought telcom generally ran off 48V supplies?


----- Original Message -----
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Sent: Wednesday, August 09, 2000 11:11 AM
Subject: Re: [EE]: [PIC]:Monitor battery string with PIC?


> More likely, cell voltage is 2V or 12V (or some interval between them).
String
> voltage is 100-250V (ie, 8-20 12V batteries in series).
>
> Sounds like telcom backup equipment.  Wish I could help, but that's where
I'm
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2000\08\09@120938 by Bob Ammerman

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100-250V per cell ??!!??

Huh!

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Sent: Wednesday, August 09, 2000 1:03 PM
Subject: Re: [EE]: [PIC]:Monitor battery string with PIC?


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2000\08\09@123217 by Andrew Kunz

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At the equipment, yes.  But we usually boost to 480V to keep the I2R losses
down.  The stuff we make here does 480V 12000A (no missing decimal) then
downconvert at the bay.

Andy










Bob Ammerman <spamBeGoneRAMMERMANSTOPspamspamEraseMEPRODIGY.NET> on 08/09/2000 11:47:07 AM

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Subject: Re: [EE]: [PIC]:Monitor battery string with PIC?








I thought telcom generally ran off 48V supplies?


{Original Message removed}

2000\08\10@180050 by Peter L. Peres

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>At the equipment, yes.  But we usually boost to 480V to keep the I2R losses
>down.  The stuff we make here does 480V 12000A (no missing decimal) then
>downconvert at the bay.

>Andy

And with this message, all my worries about drawing too much power from
the phone line with my interfaces are over ;)

Peter

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