TP4056FlexAdv is a 1S lithium battery charger build around the infamous TP4056 IC with input voltage regulator and output boost curcuit.
What is it?
TP4056FlexAdv-v2.20 is a 1S lithium battery charger build around the infamous TP4056. It is a 3 in 1 module which includes in a single PCB a voltage regulator so it can be powered from a wide selection of power sources including solar the main circuit which is the TP4056 charger and battery protection circuit and a third part is the booster circuit which allows for output from battery level up to 24V.
Why did you make it?
I am sure all who start working with lithium batteries face the same problem.. how to charge them safely. Over time one of the most common and trusted circuit available is the one build around the TP4056 module with many available out there in various incarnations and which all have their good and bad points... they are also cheap... very cheap... Cheap comes with its inherited problems... the tiny pcbs come with microUSB connectors easily flying off the pcb, if you want to power them with anything other that the microUSB you need to solder wires on the pcb, if you need to power them with anything other than 5V you need a voltage regulator, and in most cases, you also need a third module to bring the battery voltage up to the level you need for your application.
What makes it special?
TP4056FlexAdv stands for a TP4056 charger which is Flex-ible and Adv-anced. All connections to the module are either via connectors or screw terminals - No more soldering a bunch of wires to a tiny pcb Input voltage can be either 5V USB or 8-25V from a variety of sources including solar! - You can use your old router or laptop or phone power supplies without problems. You can even connect it to a small solar panel and it will charge your batteries. - No need to buy another module to lower the voltage of most available power sources at your disposal! The battery or batteries are being charged safely and are protected against short circuits, overcharging and undercharging! You get access to the battery voltage (a load powered directly from the battery with protection) but you also get a booster circuit capable to deliver up to 24V. The booster circuit can handle loads up to 2A but in practice this depends on the battery charge level and the desired output voltage. Typical is 500-800mA, good to power a wide variety of loads. No need to buy a third module to elevate the battery voltage!
TP4056FlexAdv is only 49x49mm and it can fit in small cases. You can build a self contained power source with old or new mobile phone batteries, there are many nokia-sony etc batteries that will fit nicely under the pcb saving space and making possibly to power your projects for hours!
There is more to it! In typical TP4056 modules, the charging current is set via a fixed smd resistor at 1A... this is too much of a current for smaller batteries you may need in your projects.. TP4056FlexAdv being flexible, offers the possibility to change charging current via a jumper choosing between 60mA and up to 1A (60-120-250-500-700-800-900-1000mA)! No need to desolder and solder tiny smd resistors anymore!
And if all this is not enough, TP4056FlexAdv is kind-of-smart too! You can activate the booster circuit by an external source like a micro-controller, the arduino you use it with, a sensor etc.. you simply move a jumper (allowing for external signal to take over) and apply a voltage over 1,5V to enable the booster... Booster is activated by default delivering from battery voltage (4,2v max) up to 24V. Once you switch over to an external control source though, once disabled, it will allow battery voltage to the output without boosting it... once enabled, it will boost the battery voltage to the desired setting.
In first photo you see a prototype TP4056FlexAdv module being tested with a battery from an old SONY mobile! Second photo is the bottom side of the module where the resistors for the charging current selection are placed. Third photo shows the SONY battery attached with double sided foam type tape under the module.
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