Is it possible to use the isolated DC/DC converter PTEA415050 for battery charging. I have seen that many converters have specified limits for capacitive loads, perhaps a battery looks like a capacitive load for the converter?
PTEA415050N2AD has a maximum output capacitance limit of 1000uF. The minimum (ESR) Equivalent series resistance of the total capacitance is not be below 10mΩ. The converter can be unstable or is likely to oscillate if either of these characteristics are exceeded. The converter does not have current limit control which is typically required fro battery charging.
Thanks for your answer Tom!
It seems like it no good idea to use the converter as a charger. I will try to explain my application and I hope that someone perhaps can help me.
I have an 1997 Renault Clio electrical car that had NiCd batteries earlier, now I want to use LiFePO4 batteries. It will be 45 pcs. 60Ah batteries with 3,8V charging voltage, the batteries are serial connected. The normal way to charge these is to feed them with 171V, but since the batteries have a little difference in capacity, some will get higer and some lower cell voltage. Then I need a battery monitor system that shuts down the charging when the first cell reaches 3,8V. Also I need a cell balancing system that burns away some charge from these cells so I can continue to charge the others. These are are quite expensive systems, and to me I seems like a stupid solution, why not charge each cell individually to 3,8V? The solution I am thinking of is to rectifie the 230VAC 10A or 16A that we normaly use in Finland, then if necesary convert it to some intermediate voltage e.g 48VDC and then use an isolated DC/DC converter with current limit to feed each cell. Then I know that each cell is balanced to 3,8V at each charge. It would be nice if the cell charger had some communication interface that can report the cell voltage and also temperature, then it is possible to get a warning to not uncharge the batteries to low.
What do you think about this idea?
I don't understand what is the difference between a DC/DC converter and a charger, why are the chargers stable but not the DC/DC modules?
I need 45pcs. of isolated DC/DC converters that are able to feed 3,8V 15-20A from a common DC feed, and each converter is connected to a battery that is 0-170V above "ground" voltage.
Stefan Mattsson :
I reviewed your requirement for 3.8V serial chain 45 batteries with communication interface to monitor the batteries charging capacity.
I will have to forward this request to the Battery management power group. The PTEA series or any other TI power module does not have current limiting by controlling the voltage levels.
The link to battery management is
http://www.ti.com/sitesearch/docs/universalsearch.tsp?searchTerm=BATTERY CHARGE MANAGEMENT&linkId=1
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