PPRuNe Forums - View Single Post - 787 Batteries and Chargers - Part 1
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Old 27th Jan 2013, 17:42
  #205 (permalink)  
RR_NDB
 
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Hi, cwatters (#199)

I yet expressed my concern on the max current the main battery is alowed to supply the DC bus. In an earlier post we discussed the issue.

Points to mention:

1) As confirmed by TURIN there is a diode module easily understood as the switch that put the (charged) battery in the bus. I agree with your concern that a limiter is important. I consider ESSENTIAL when using these dangerous batteries, letīs say, DANGEROUS CELLS. Even with superb circuitry they will remain DANGEROUS.
2) A limiter to be safe must be integrated to the System Software (unless you put a FE in the cockpit). Which are the priorities when the bus needs the help from the (main) battery?
3) As i understand the Battery charger is connected BETWEEN the battery and the diode module. The management of the best configs in a degrading scenario is not so simple.
4) And you must always respect the weakness and criticality of the dangerous cells. Who in the project made the algorithms ? (required and certainly existent). Boeing or a partner?

Integration teething pains? Or nightmare?
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