Trying to make powerbank circuit

252

02:11:50

Trying to make 5v power bank circuit but no voltage regulator is available

published 6 years ago

hurz

6 years ago

a healthy lithium ion 18650 cell is about 50mOhm. Two in series is 100mOhm. Stacked two 3.7V are 7.4V unloaded. With a diode like you did here and 2A current the voltage does drop according

hurz

6 years ago

99.9% of powerbanks on the market do have not stacked cells to increase voltage. Cuz this would need extra effort to bring the voltage down to 5V for the discharge case. Anyway, for the discharge we need an upconverter and for charge a current regulator, but only one cell means better scalability and less cells. Single cell powerbanks. Hope you understand. http://everycircuit.com/circuit/6450848264355840

BillyT

6 years ago

Been there done that, in the end by time you find a case to hold all you components and cct board it gets a bit messy, not to talk about your input output terminals. Why re-invent the wheel, check out what is available on EBay for less than $5.00

hurz

6 years ago

but if you really want to go the diy way, check this https://learn.adafruit.com/minty-boost?view=all

sam111

6 years ago

Thanks to all of you for guiding me...learn a lot from u all guys

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