Hello everyone,
I have a small project to do which is preparing something similar to an automatic emergency light.
I have purchased 2 TP4056 charging circuit boards with two 18650 batteries and a P channel Mosfet.
My load is a 6V LED board. any suggestions on how to do the connections?
I want to try and connect each TP4056 board separately to an 18650 battery ( for charging) with a common 5V input. then the outputs of each board to be connected in series to later lower the voltage to 6V using two resistors 10k and 24k.
Can you please confirm if my circuit will work that way or should I be using some other solution?
I suggest you switch to a single battery and a MT3608 (or other buck converter) to convert whatever input voltage to 6v.
Have a look at this tutorial, all you would have to do would be to change the value of the 7.5K / 1K resistor combo so that the division of the 2 results into approximately '9'
Also keep in mind that the TP4056 is not suitable for load-sharing, You could however connect 2 diodes, 1 connected to 5v input and the cathode to the load, and 1 from the battery with the cathode to the load. If 5v is supplied, the battery will charge and no current from the battery charging will flow to the load. (the charging voltage never exceeds 5v as far as i know)
For the bypass (load-sharing) ? any diode would do, though you should observe the maximum current it allows for, and the lower the voltage drop, the more efficient the circuit will be.
LiPo batteries are dangerous and should be handled with care
Whatever you do, don't load share through the TP4056, the charging may continue once the battery is full, which may cause it to explode.