Electronics > Projects, Designs, and Technical Stuff
LTC3786 3V to 18V boost converter
Hamed_ta:
still I think the esiest and most flexible way to design a battery powered power supply is single cell battery approach because how many batteries with diffrent capacities you would have you can be sure that always all of them will charge and discharge fully balanced, but it has it's own drawbacks too including
1 - by only using boost converter you can't make voltages less than input voltage for example 3.3V output when battries is fully charged.
2 - the VGS voltage for biasing common Mosfets is higher than input voltage so you need use logic level mosfets with low maximum VDS which limits output voltage.
3 - the current will be really high so you should take care of high current issues (huge inductor with high I sat).
4 - the boost converter doesn't disconnect output from input when it's disable you should take care of that with extra switch.
5 - the voltage for supply IC is too low so same as my case a charge pump extra booster is needed.
despite all the concerns that I mentioned as the most important and expensive part in a battery power supply is the battries, still I think using one cell battries and boost the voltage is the more rational as the charge circuit design is simple and straight forward.
now what approach do you have in mind for adjust output current ?
however please let me know if you know any BMS design which be able to take care of all concerns in series battery maybe in next design I put it in mind.
NiHaoMike:
Even in laptops, where the majority of the load is on the order of 1.2V or less, it's very uncommon to find a 1S battery configuration. My guess is that it's easier to deal with lower current at a higher voltage.
Hamed_ta:
this converter should be which be able to produce voltages from 5v to 18v and current 0-5A,
but when I design in LTpowerCAD by reducing output voltage and current the inductor and sense resistor values which were ok for maximum voltage and current output, get out of range ? what is the solution ?
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