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???
04/27/11 13:45
Modified:
  04/27/11 13:52
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 		 #182074 - Another methode...
Responding to: ???'s previous message
If permanent current consumption per cell is no problem, as you said, you could build a very simple VCO by the help of a comparator and voltage reference and transmit the clock by an opto. There are OPamps and comparators available today, that are I/O rail-to-rail and work down to 1.4V supply voltage. Microchip has a lot of them. Such one could directly be powered by a cell. As reference you could use a LM385-1.2 and a HCPL-0701 as opto would need only very little current. If you set the period of clock to about 10msec, then the propagation delays of opto and finite transition times of comparator don't play any role.

Kai Klaas

List of 37 messages in thread
TopicAuthorDate
Measuring cell voltages of batteries            01/01/70 00:00      
   Large currents            01/01/70 00:00      
   Yes, you can use a mux...            01/01/70 00:00      
   Use a MUX            01/01/70 00:00      
      Mux            01/01/70 00:00      
         Opto's for this application suck.            01/01/70 00:00      
            current issues            01/01/70 00:00      
         Use capacitive sampling            01/01/70 00:00      
            Normalizing cells            01/01/70 00:00      
   Linear Technology...            01/01/70 00:00      
      Others too.            01/01/70 00:00      
   AOs            01/01/70 00:00      
      Cost shouldn't be too important here            01/01/70 00:00      
      "AO" ??            01/01/70 00:00      
      Mux            01/01/70 00:00      
   Linear technology ...            01/01/70 00:00      
      Cross-reference            01/01/70 00:00      
   Another methode...            01/01/70 00:00      
      Something like that...            01/01/70 00:00      
         why bother mucking with such ....            01/01/70 00:00      
            A lot of reasons...            01/01/70 00:00      
               when so ....            01/01/70 00:00      
                  Raj should come back...            01/01/70 00:00      
         What a lot of components            01/01/70 00:00      
      There are lots of ways            01/01/70 00:00      
         LT            01/01/70 00:00      
            Pitfall...            01/01/70 00:00      
               precision and stability            01/01/70 00:00      
                  Stability            01/01/70 00:00      
                     True, Andy            01/01/70 00:00      
                        Can't use designs with lots of varying series resistors            01/01/70 00:00      
                           Number of resistors, Westermark            01/01/70 00:00      
                              You don't need to handle 360V by a divider            01/01/70 00:00      
                                 have you thought of V/Fs ?            01/01/70 00:00      
                                    no            01/01/70 00:00      
                              One voltage divider handles several cells in subchain            01/01/70 00:00      
                  AARGH            01/01/70 00:00      

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