Electronics > Beginners
How to build a simple volatge buffer
Adhith:
Hello there friends...
I had made a thread related to the same topic in here 2 days ago but I think I wasn't able to clearly express my question there so made this thread. Sorry for the inconvenience.
I have a 4S battery pack which is connected to a BMS module. To get a stable 12V output from it, a buck/boost module is connected to its output, but the high frequency switching signal of the buck/boost module is causing the BMS to shut off after 3 mins . Its confirmed that the problem is with the BMS in my previous thread. I' now trying to solve this problem by using a voltage buffer between the BMS and the buck/boost module so that it could smoothen the output from the BMS. So does this idea work and if yes then anyone could help me with a simple circuit.
tszaboo:
Connect the output of an opamp to the negative input. :-//
Adhith:
--- Quote from: NANDBlog on June 04, 2018, 06:08:12 pm ---Connect the output of an opamp to the negative input. :-//
--- End quote ---
Sir could you please elaborate. I'm a beginner in electronics. The current draw would be around 1 to 1.5A so could an opamp deal with it??
capt bullshot:
An OpAmp buffer won't help you here (I've read your other thread now).
From your description, I see three ways that could cause the BMS to turn off:
1) EMC issues:
I'd suppose you to try a Pi type L/C filter between the BMS output and the converter input - A capacitor (ceramic 1uF ... 10uF, parallel with 220uF ... 1000uF electrolytic) at each side, and a 100uH ... 470uH inductor between.
2) low load current induced auto-turn off (IMO the least probable, or you've got a really strange BMS)
Test your system (battery, BMS and converter) with a constant load (e.g. a power resistor - 22 Ohm for about 0.5A) applied to the output of the converter, and no other load and no filter connected.
3) weak battery
Watch the total battery voltage (input of the BMS), and watch each cell voltage while running your system until it turns off.
Test each one for itself (not the combination of both) to find out the root cause.
tszaboo:
--- Quote from: Adhith on June 04, 2018, 06:22:04 pm ---
--- Quote from: NANDBlog on June 04, 2018, 06:08:12 pm ---Connect the output of an opamp to the negative input. :-//
--- End quote ---
Sir could you please elaborate. I'm a beginner at electronics. The current draw would be around 1 to 1.5A so could an opamp deal with it??
--- End quote ---
What? Anything with 1A is not a "buffer".
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