[laulau]

Thank's for the recommandation.

I think i had  a low power PSU connected yesterday when i repowered the UPS.
I'll  try with a 2A PSU today and led you now.

[laulau]

Hi Stephan,
I let the TX run on UPS, after an hour no more power at the output. It starts again after i plug a 12V 2A PSU.
I have 8.2V at B-B+ (with or without PSU), only 3V at P-P+ ?
Is the TP5100 faulty ?

[laulau]

PS. A recommendation from my side - please avoid cells with "Fire" in the cell name. They mostly do not have over 1/3 of the rated capacity and they tend more to let its name become reality.

 Do you think Panasonic is a better choice ?

[engolling]

Hi Stephan,
I let the TX run on UPS, after an hour no more power at the output. It starts again after i plug a 12V 2A PSU.
I have 8.2V at B-B+ (with or without PSU), only 3V at P-P+ ?
Is the TP5100 faulty ?

At least, the protection circuit seems to be open. Maybe you can remove and insert the 18650 Cells again and check if something changes.
Because it the switches are closed you would see 8.2V at P+ and P-

What that means for the TP5100 I can not tell you at the moment but maybe it trys to bring up the battery voltage with the "precharge" current again and that why it seems to be faulty.

[engolling]

PS. A recommendation from my side - please avoid cells with "Fire" in the cell name. They mostly do not have over 1/3 of the rated capacity and they tend more to let its name become reality.

 Do you think Panasonic is a better choice ?

I can recommend cells from all the known manufacturers (Samsung, Panasonic, Sony, ...) and I can recommend to buy them not from china because there are a lot of counterfeits and from my point of view that are devices which are safety relevant.

Regards,
Stefan

[laulau]

Hi Stephan,
I let the TX run on UPS, after an hour no more power at the output. It starts again after i plug a 12V 2A PSU.
I have 8.2V at B-B+ (with or without PSU), only 3V at P-P+ ?
Is the TP5100 faulty ?

At least, the protection circuit seems to be open. Maybe you can remove and insert the 18650 Cells again and check if something changes.
Because it the switches are closed you would see 8.2V at P+ and P-

What that means for the TP5100 I can not tell you at the moment but maybe it trys to bring up the battery voltage with the "precharge" current again and that why it seems to be faulty.

Remove and insert the 18650 Cells does not help.
I powered off and on the UPS without the load(4ProTX), the blue led lit and the voltage come back on P + P-. I then reconnected the 4ProTX, I can again power off and on the PSU without having an output cutoff!

[engolling]

Hi Laurent,

I'm at the moment not sure what is happening in this case.

I think there might be some issues be related. The XL6009 getting crazy in combination with low input voltage or the TP5100.
I will have to check this on an oscilloscope.

On top the protection board - there might be some current peaks / or maybe backward voltage in combination with the XL6009 without load - bringing the protection circuit to switch off immediately. 
For now, I'm also not sure under which conditions the protection board resets - cut the cell voltage (or maybe both) or cut the supply voltage maybe even all three things together because then the chip is out of power and it might forget its past.

During first assembly I tested briefly all for me possible faults - different modules having bad contact / or being live disconnected, batteries running empty, baby getting the whole device and use it for playing    - so I thought worst case was tested   .

Latest beginning of next week we will do further testing on T3G's strange behaving device and also check if it could have a bad impact on the connected devices. At the moment I can not imagine, since the TX4Pro and the RX 2 devices have some pretty failsafe linear regulators on its inputs.

Best regards

[engolling]

We were able to do some investigation today.
For the design v1.x you can get some problem with the TP5100 charger and the XL6009 without voltmeter when the battery protection circuit has switched the battery off resultiung in too high voltage at the output at least in idle mode which can damage parts on the pcb due to discharging of output capacitor.

This does not happen when a load is connected all the time.

Regards

[engolling]

Hello, I think we fully understood the problem today.
If the battery protection circuit was active and the battery is off. Then the TP5100 give some pulses and tries to precharge the battery.
This pulses activate the xl6009 which has to regulate its output voltage in the first Moment.
If this happens all the time the output capacitor gets charged, worst case about 45V.
This only happenes when there is no load. When the Weatherduino is connected all the time this can not happen. Moreover it depends also on the Variation of the input capacitor of the XL6009. That is why laulau got another voltage than Heini.
This is probably the reason I did not notice this in my first wired setup described in the first post because it did not happen during testing.

I do not think it happenes with the XL6009 with voltmeter because the voltmeter is load enough to prevent the charging of the capacitor. I did not notice such behaviour during my tests.

There are some measures to prevent this happening.
1. Adding 400uF capacitance at the input of the XL6009
3. Adding a resistor as dummy load at the output.

Sorry for the inconvenienve but I did not notice this could happen because it is also depending on the deviation pf the modules.

UPDATE: I just tried the same with the PCB with voltmeter and here I can not reproduce this behaviour.


Best regards

[laulau]

Hi Stephan,
My problem of output cutoff  after less than an hour still happens . If  i plug again the 12V power supply it restarts .
The blue led is on so i think the batteries voltage is not too low.
Is there a fix for that ?
Thanks