milvapp
Member level 5
- Joined
- Apr 17, 2010
- Messages
- 88
- Helped
- 3
- Reputation
- 6
- Reaction score
- 2
- Trophy points
- 1,288
- Location
- chania greece
- Activity points
- 1,882
I have no idea what a PV panel is.
PV panel is a photovoltaic cell.
So my charger needs to be outdoors that why I am seeking a supply from the device it is going to charge.
From what I know devices that have a USB plug have internal charging circuit so what is the external charger you describe, did you make it?
I think the internal charging circuit you mention is the circuit used for charging the battery of the device
No I have not made it yet , and there is no reason to give the details of the design .
The overall idea is that it harvests solar energy ,storing it to supercapacitors and then charging a usb device.
In this system there are opamps which need supply voltage.
You insist on the charger getting supply from the device it is intended to charge, I don't know why you insist on that.
I insist because as I explained above the charging circuit will be for outdoor use so it will not be ''appropriate'' to have an extra power supply for that
Last edited: