mrinalmani
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Hi!
I am working on a small project which requires charging a cell phone lithium battery from a 12V source. Input comes form a 12V lead acid battery and output goes into the USB port of the cell phone.
Now, if it was about charging an isolated lithium cell, it would be rather simple to design a CC or CV converter.
However since it is a cell phone battery, it must be having a charge controller on the PCB of the cell phone or perhaps integrated in the battery itself. So I guess, direct connection to battery terminals of the phone will not be available.
My questions are:
1. Are normal cell phone chargers CC or CV devices?
2. How does the cell phone know how much power the charger can deliver? Suppose I have a 1.5A charger, but the battery is capable of upto 2A. Then if the battery tries to pull 2A from the charger, the charger will shut down. But this does not happen. Instead, the battery charges slowly without shutting down the charger.
Thank you!
I am working on a small project which requires charging a cell phone lithium battery from a 12V source. Input comes form a 12V lead acid battery and output goes into the USB port of the cell phone.
Now, if it was about charging an isolated lithium cell, it would be rather simple to design a CC or CV converter.
However since it is a cell phone battery, it must be having a charge controller on the PCB of the cell phone or perhaps integrated in the battery itself. So I guess, direct connection to battery terminals of the phone will not be available.
My questions are:
1. Are normal cell phone chargers CC or CV devices?
2. How does the cell phone know how much power the charger can deliver? Suppose I have a 1.5A charger, but the battery is capable of upto 2A. Then if the battery tries to pull 2A from the charger, the charger will shut down. But this does not happen. Instead, the battery charges slowly without shutting down the charger.
Thank you!