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???
04/26/11 06:30
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 		 #182044 - Use capacitive sampling
Responding to: ???'s previous message
The typical solution in industrial environments is to use a flying capacitor to sample the cell voltage and to then disconnect the capacitor from the cell and apply it to your ADC. This provides excellent CMRR without precision resistors and is easy to calibrate. IIRC Linear Technology do a suitable switching chip.

Do not use optos, it will never work well.

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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