do not use inductive voltage or current sense.Hi, I have a balancing circuit as shown in figure. Cells are balancing each other by transporting enrgy from higher energy cell to lower energy cell. My problem is that; the duty of the capacitors is to smooth battery voltages but when I change the battery capacities, the ripple voltage changes. I do not know why. I thought, the value of the capacitors can be found as ILoad*the time swith is opened/ ripple voltage. Please help me to find the value of the capacitor and why the ripple voltage depends on the battery capacity.
THANK YOU.
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Thanks Sunnyskyguy for your advices. I am going to use your instructions but right now I need exact formula of the ripple voltage. Because it is my thesis project and ı need to write how ı determine the value of the circuit components.
Thank you.
Furthermore, I could not find a formula for capacitor value by keeping ripple voltage constant.
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All capacitors and batteries alike in the same quality, size and voltage range may have different Ah ratings like capacitors have different uF ratings.
From my experience low ESR e-caps are have a C*ESR=T time constant <10 µs and smallest <1µs, while general purpose (G.P.) caps are > 100 µs to > 1000 µs in larger sizes.
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then C=15.4 kilo-farads
if ESR was say 0.1Ω
then ESR*C=1,540 seconds =0.43h
... ...
You can lower ESR of a battery to 1mΩ with an ultralow ESR Cap but then that only lasts for a few microseconds to ms depending on ESR of battery , cap and C.
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