Good day or evening!
In this article I want to introduce a portable charger with the ability to adjust the output voltage from 12 to 35 v
This device was made to charge a laptop, but can also be used for other devices, such as high-power LEDs.
Principle of operation:
3 series-connected batteries (18650) give out 12 v then there is a dc-dc boost module
increasing from 12 to 35v and with a load of up to 150 w (150 w subject to forced cooling).
Toggle switches select battery connection modes (SEQUENTIAL, PARALLEL)
For manufacturing, we need:
1) Case
2) Toggle switch 6 PIN (ON-OFF-ON) 2 pcs
3) 2-pcs RCA jacks
4) 3-piece 18650 batteries
5) Li-ION charge board on TP4056 chip
6) Boost stabilizer
7) Multimeter
8) Soldering iron, tin, flux
9) Wires
10) Drill
11) Hot melt adhesive
I took the case from the old power supply
Mark the holes for the toggle switch and drill
Then we solder everything according to the scheme
The wires were taken from a computer power supply
This is how it should turn out
Since a laptop needs 19 v 3.5a
Boost stabilizer needed
The converter was purchased in China and has the following characteristics:
Input voltage - 10 ... 32 V.
The output voltage is 12 ... 35 V.
Output current up to 6 A.
Input current up to 10 A.
Free cooling output power is 100 watts.
The output power when blowing is up to 150 watts.
Efficiency up to 94%.
The open circuit current is 25 mA.
Dimensions - 6.5 x 5.5 x 2.5 cm
Before assembly into the enclosure, everything must be checked and configured.
Total:
As a result, we get a charger with two output voltages of 19 v and 4.1 v, if you wish, you can add a USB socket with a boost module to the case and eventually get two in one.
Demonstration of work: