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PWM signal causing problem for battery pack BMS
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C:

How about doing a simple load test of the BMS to see if it shuts off.

First understand how to create this load.

When you change the load on your buck/boost module, you are changing the load on your BMS.

If you connect a resistor to the output of buck/boost module, when you change the voltage across that resistor you change the load.
You can start with a small load, a small voltage across the resistor by adjusting output of buck/boost module.
Run a test to see if BMS turns off.
Increase the load by adjusting buck/boost module voltage higher.
Run a test to see if BMS turns off.

You should not go past the limits of the buck/boost module or the watts limit of the resistor.

Just the resistor connected to output of buck/boost module.

This is a test of BMS to buck/boost module with a nice load on the buck/boost module.
This will identify if the buck/boost module is the problem or the led driver connected to buck/boost module.

C
Adhith:

--- Quote from: C on June 03, 2018, 04:36:19 pm ---
How about doing a simple load test of the BMS to see if it shuts off.

First understand how to create this load.

When you change the load on your buck/boost module, you are changing the load on your BMS.

If you connect a resistor to the output of buck/boost module, when you change the voltage across that resistor you change the load.
You can start with a small load, a small voltage across the resistor by adjusting output of buck/boost module.
Run a test to see if BMS turns off.
Increase the load by adjusting buck/boost module voltage higher.
Run a test to see if BMS turns off.

You should not go past the limits of the buck/boost module or the watts limit of the resistor.

Just the resistor connected to output of buck/boost module.

This is a test of BMS to buck/boost module with a nice load on the buck/boost module.
This will identify if the buck/boost module is the problem or the led driver connected to buck/boost module.

C

--- End quote ---
Previously I have connected the led driver and an amplifier board to the output of the buck/boost module and for both the cases the BMS shuts down. Connected a voltmeter at the output and it also makes the BMS to shut down after a while. So I believe that this strengthens the fact than the buck boost module is the problem right?? Also the BMS has no problem in powering the amplifier board directly without the buck/boost module and thus there is no problem with the BMS either. So this proves the thing right?? anyhow I'll do the resistor test to confirm this.
Adhith:
Yes, the resistor test confirms it. The buck boost module is the problem. But now the much bigger problem is that i think the BMS has permanently damaged after repeatedly doing these load test. Now it cant no longer power a load even when directly connected since it turns off as soon as it is powered. Ordered a new BMS now. So is there a way to solve my problem?? any help would be appreciated
Adhith:
Does making a voltage buffer solves the problem??
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