Electronics > Beginners
PWM signal causing problem for battery pack BMS
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Adhith:
hello friends...
I have a battery pack arranged in 4S1p configuration. It is connected to a BMS as well. The output from the BMS is connected to an amplifier board and a LED driver. While using the battery pack to power the amp, everything works fine and I have no trouble. But, when I power the LED driver (with amp turned off)which drives a few led strips, it works for around 5 minutes or so and then suddenly turns off. The small digital voltmeter attached to the output terminals of the BMS also goes dead. After waiting for around 10 mins, the BMS is back to normal and could be used to power the LED driver till the problem is repeated afte the next 5 min. So what would be the reason for this?? I'm very sure that The led strip wont consume a current more than 400mA ,so i think there won't be an over load issues for the BMS.
jeduffy:
Does anything get hot?  Something that slow sounds like it's likely to be overheating.  Any details on the BMS, LEDs, amplifier, LED driver?
Adhith:

--- Quote from: jeduffy on May 29, 2018, 11:22:47 pm ---Does anything get hot?  Something that slow sounds like it's likely to be overheating.  Any details on the BMS, LEDs, amplifier, LED driver?

--- End quote ---
No, nothing gets hot. The BMS, the battery pack and the driver stays cool. Another thing is that, the driver and LEDs work perfectly when powered by a 12v wall adapter. So the problem is definitely with the BMS i guess.
The BMS is the one with added balancing option. I have attached a pic of it. The LED driver is a 12V WiFi controlled driver which lights up the 12v LED strip. The led driver is in fact powered by a buck boost module (set at 12V) which is connected to the output pads of the BMS.
Adhith:
Should I try replacing the BMS??
C:

Some of the USB battery packs will turn off on to small a load.

The idea is that such a small load is a leak that is just draining the batteries.

Need to remember that electronics can be fast and could be shutting off on no current if your leds are PWM driven.
A smoothing cap might help here.

You check the difference in current for the loads

Adding a large capacitor will present a more constant load to BMS
Adding a resistor load would work around the too small current load.

C

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