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Power supply from USB wall adapter...some works...some doesn't

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atomosrl

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Hello!

I've two battery powered board with onboard charger.
Here some detail
  1. Board1 has fast charger (needs 15V from wall adapter) and I've a power delivery IC to request correct voltage from the power supply
  2. Board2 has linear charger (needs 5V), there's not power delivery IC in this case
I can charge batteries of Board1 with all kind of power adapter (QC compliant) I have.
I can charge batteries of Board2 only with some adapter, not all.

Question: in your opinion (and knowledge)...with quick charge adapter I've also to request 5V voltage?

how to recognize an adapter compliant with no power delivery IC board?

Thanks
Stefano
 
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Hi,

in electronics we use values with units to specify our devices.
This is also true for power supplies ... and the power demand of connected equippment.

The most urgent specifications are voltage and current. Further: timing informations, tolerances, temperatures, noise ....
All can be found in datasheets and/or specification sheets.

Look up the values, compare them ... this is reliable information ... and you are done.

****

"Board1" is no meaningful information. We can´t validate anything. Same applies to "onboard charger", "fast charger", "power delivery IC", "correct voltage", "all kind of power supply", "some adapter" ... this does not give a clue about what this means in technical terms.

It´s as meaningful as if I give my opinion (which is just an information without proove): "blue colored power supplies have better efficiency when plugged in in reverese". What can you gain from this information?

It's as meaningful as "I can charge batteries of Board2 only with some adapter, not all." What usable information do we get from it?

On both one can only answer: Maybe. It depends. One needs to properly investigate.

Klaus
 
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KlausST said:
Hi,

in electronics we use values with units to specify our devices.
This is also true for power supplies ... and the power demand of connected equippment.

The most urgent specifications are voltage and current. Further: timing informations, tolerances, temperatures, noise ....
All can be found in datasheets and/or specification sheets.

Look up the values, compare them ... this is reliable information ... and you are done.

****

"Board1" is no meaningful information. We can´t validate anything. Same applies to "onboard charger", "fast charger", "power delivery IC", "correct voltage", "all kind of power supply", "some adapter" ... this does not give a clue about what this means in technical terms.

It´s as meaningful as if I give my opinion (which is just an information without proove): "blue colored power supplies have better efficiency when plugged in in reverese". What can you gain from this information?

It's as meaningful as "I can charge batteries of Board2 only with some adapter, not all." What usable information do we get from it?

On both one can only answer: Maybe. It depends. One needs to properly investigate.

Klaus
Click to expand...

Hello Klaus, sorry. I think I did explain my situation clearly.

I'll try to simplify the discussion. I have a board designed and built by me with a linear charger that requires 5V input (less then 5W)
With some adapters I can charge onboard batteries (I've a LED on 5V rail).
With some adapters I've 0V. It is not a power problem because adapters I use are 30W, 45W and 65W rated.
It seems that some adapters provide 5V only in the presence of a specific request while, to my knowledge, they should provide 5V and then higher voltages only after request on CC1 and CC2.
I hope this makes things clearer
Regards
Stefano
 
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Quick Charge (QC) adapters are capable of providing different voltage levels (5V, 9V, 12V, etc.) based on the communication with the connected device. Without any specific request from the device, most QC adapters default to providing 5V. However, this is not always guaranteed, and the behavior can depend on the specific QC adapter.
 
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FvM said:
USB standard specifies a specific resistor termination of D+ and D- to enable VBUS supply.
Click to expand...
That may be a problem....I haven't D+ and D- on the connector :-\
thanks
Stefano
--- Updated ---

aliarifat794 said:
Quick Charge (QC) adapters are capable of providing different voltage levels (5V, 9V, 12V, etc.) based on the communication with the connected device. Without any specific request from the device, most QC adapters default to providing 5V. However, this is not always guaranteed, and the behavior can depend on the specific QC adapter.
Click to expand...
thank you for reply
Stefano
 
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