DIY

Power bank from 3.7 volt lithium-ion battery

Power bank from 3.7 volt lithium-ion battery Hello DIY !!! In this article, I want to tell you how to make a turn bank with your own hands, because many have come across the fact that during long trips by bus or being in the forest, the phone is often discharged at the most inopportune moment. It will not take much time to make it with your own hands and it will be clear even to the person who took the soldering iron in his hands for the first time. We will collect according to this scheme:
Power bank from 3.7 volt lithium-ion battery < b> For this we need the following details:
1). Electrolytic capacitor 25 volts 470 microfarads. 2 pcs.
2). Ceramic disc capacitor 470 pcf.
3). Zener diode 5V1.
4). Variable resistor for 10 kOhm or 4.7 kOhm.
5). Transistor KT805AM and its pinout.
6). Ferrite ring size 22 X 8 X 5 mm.
7). Copper wire 0.6 mm.
8). Small radiator.
9). Standard USB output.
10). LED + 1 kΩ resistor.
11). Li-ion 3.7 volt battery.
12). Textolite 6 X 9 cm.
1).
Power bank from 3.7 volt lithium-ion battery If not at 25 volts they can be replaced with 16 volts 470 microfarads
2).
Power bank from 3.7 volt lithium-ion battery It can also be replaced with another one with the same capacity.
3).
Power bank from 3.7 volt lithium-ion battery If there is no 5.1 volt zener diode, it can be replaced with a 4.7 or 4.5 volt zener diode. You can also put a regular diode, and after it install the LM7805 stabilizer.
4).
Power bank from 3.7 volt lithium-ion battery Variable a resistor is needed to select resistance and output current. After that, when we set the output current, replace it with an ordinary resistor, initially measuring the resistance set on the variable resistor and select the closest one at face value.
5).
Power bank from 3.7 volt lithium-ion battery < a href = "https://usamodelkina.ru/uploads/posts/2021-04/1619641276_kt805.jpg" rel = "prettyPhoto"> Power bank from 3.7 volt lithium-ion battery The transistor can also be replaced with analogues or similar in datasheet, for example:
2SC2562, BD109, BD123, BD148, BD149, 2N3054, 2SC3422, 2N3766, 2N3767, 2N6260, BDY12, BDY13, BDY61, BDY78, MJE13009.
6).
Power bank from 3.7 volt lithium-ion battery First, we wind 60 turns of the first winding, then we wind 16 more turns in the remaining place in the same direction as the first. The core can be taken rectangular, from a surge protector or W-shaped, as long as it is ferrite.
8).
 Power bank from 3.7 volt lithium-ion battery It is needed to protect the transistor from overheating, since at the initial stage of charging the phone consumes more than when it is half charged.
9).
Power bank from 3.7 volt lithium-ion battery It can be removed from a burnt out charger from a phone or from a broken TV-box.
10) .
Power bank from 3.7 volt lithium-ion battery LED any color is suitable, the main thing is that it has a low current consumption. The resistor is needed to reduce the current supplied to the LED, if you turn it on without a resistor, it will overheat and burn.
11).
Power bank from 3.7 volt lithium-ion battery For sure Many have old or broken phones lying around at home, but only those that have recently failed, since lithium-ion batteries and accumulators also have an expiration date.
12).
Power bank from 3.7 volt lithium-ion battery < br> Why exactly this size? Because I cut out the batteries to fit to fit neatly in the case above the battery.
Assembly.
Installing a capacitor on the input.
 Power bank from 3.7 volt lithium-ion battery Next, we install and fix the ferrite transformer and solder the beginning of the winding for 16 turns to the “plus” contact of the electrolytic capacitor, this will be the “plus” of the circuit power.
 Power bank from 3.7 volt lithium-ion battery The next step is to install a ceramic capacitor between the “minus” of the electrolytic capacitor and the end of the 60-turn winding.
 Power bank from 3.7 volt lithium-ion battery Next, we install the transistor on the radiator and screw it to the PCB. To protect the contacts from closing on the radiator, you can install a cardboard partition as in my case.
Power bank from 3.7 volt lithium-ion battery Now we install the zener diode to the end of the 16-turn winding and connect this connection to the collector of the transistor, and also solder the variable resistor between the cathode of the zener diode and the connection of the winding with the ceramic capacitor. Connect the beginning of the 60-turn winding to the base of the transistor.
 Power bank from 3.7 volt lithium-ion battery Now we put an electrolytic capacitor on the output. The “plus” of the capacitor is soldered to the cathode, and the “minus” to the emitter of the transistor and the “minus” of the first capacitor.
Power bank from 3.7 volt lithium-ion battery Well, now it remains to install the USB connector. Extreme conclusions are “plus” and “minus”.
Power bank from 3.7 volt lithium-ion battery Turning variable resistor managed to achieve a consumption of 310 milliamperes at the input and 160 milliamperes at the output. By measuring the resistance across the variable resistor, it was found that the resistor is needed for 330 ohms. I also installed the LED and as you can see everything works great.
Power bank from 3.7 volt lithium-ion battery The output voltage turned out to be 5.6 volts.
 Power bank from 3.7 volt lithium-ion battery Then I checked it, as they say, in combat conditions. As you can see, it calmly copes with the smartphone's charge.
 Power bank from 3.7 volt lithium-ion battery Thanks everyone !!! Happy repetition and success with Samodelkin !!!

Source:

usamodelkina.ru

Show More

Related Articles

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button