This is a 12V Mini UPS circuit board. I am trying to design it for my project. I need help with it's schematic diagram and BOM. I couldn’t find any datasheet or diagrams for this anywhere. Somebody please help me to design this.

 

If it is only a 2 sided PCB, yes it can be done. Are you willing to pay for this?

 

Hello,

It looks like the numbers of the parts are removed.
This is likely done to avoid the copying of the circuit.

Bertus

 

what are the part numbers of the ICs?

 

It looks like the numbers of the parts are removed.

part numbers are removed.

It looks like a LED driver for color LEDs. Without the part numbers for the ICs it will be impossible. This is a long hard job.

 

Your homework includes stealing someone else’s design? What is the title of the course, “Hardware Pirating?”

 

TS stated it is an UPS. and that is plausible...

U1 is converter that takes input power and charges battery. R1 is current sensing shunt.
U2 is converter that turns that into desired output.
U3 is possibly just a mosfet that connects battery if input supply is missing...

and i agree, learning from other designs is fine but one should be making own. specially today when there is plethora of options and documentation.

I am trying to design it for my project. I need help with it's schematic diagram and BOM.

start drawing something and ask for help when you hit the roadblock...

 

Looking at the asking price for this UPS module, all semiconductor have to be of chinese origin. Larger diodes are SS54 or SS52 (5A Schottky). The exact charging IC (LED driver?) used, SMD code ALB + date code, is unclear. The boost DC/DC converter is a XR2681. Battery protection is done by a XB8089D.

 

Hello,

It looks like the numbers of the parts are removed.
This is likely done to avoid the copying of the circuit.

Bertus

Here are some of the part numbers I can see from the board, which I already purchased. I just want to implement the same design in my project.
12v Mini UPS module which has U1 = A-l QFMA (I didn't find this chip online), U2 = XR2681, U3 = XB8089D, R1 = T110, L1= 4R7, L2 = 3R3, D1 = SS34.

 

what are the part numbers of the ICs?

Here are some of the part numbers I can see from the board, which I already purchased. I want to implement the same design in my project.
12V Mini UPS module, which has U1 = A-l QFMA (I couldn't find this chip online), U2 = XR2681, U3 = XB8089D, R1 = T110, L1 = 4R7, L2 = 3R3, D1 = SS34.

 

part numbers are removed.

It looks like a LED driver for color LEDs. Without the part numbers for the ICs it will be impossible. This is a long hard job.

It's a 12V DC mini UPS circuit that takes DC12V-DC24V as input. Attach 3.7V 18650 batteries. And the output is DC9V or DC12V (depends on shorting jumpers)
Here are some of the part numbers I can see from the board, which I already purchased. I just want to implement the same design in my project.
12V Mini UPS module, which has U1 = A-l QFMA (I couldn't find this chip online), U2 = XR2681, U3 = XB8089D, R1 = T110, L1 = 4R7, L2 = 3R3, D1 = SS34.

 

Your homework includes stealing someone else’s design? What is the title of the course, “Hardware Pirating?”

Sorry, but my main goal is not to steal someone's design and sell it or something like that. I was just wanting those diagrams to implement on my diy project, which is not a commercial product. I've no intention to sell these designs. If what I'm doing is considered stealing, then sorry, I'll try to figure the diagram myself; it'll be time-consuming for me, but not impossible.

 

If it is only a 2 sided PCB, yes it can be done. Are you willing to pay for this?

I wanted to implement those diagrams in my DIY project, which is not a commercial product. I've no intention to sell these designs. But still, I want to know what your quotations are.

 

Sorry, but my main goal is not to steal someone's design and sell it or something like that.

Stealing a design for your own DIY project is still stealing.

 

Stealing a design for your own DIY project is still stealing.

I also don't support stealing. Okay, then I'm sorry, thanks for pointing out my mistake. I don't think I'll get any help. No problem, I'll try something else. Thanks.

 

It is an OSHW product (open source hardware) so design including schematic is here:
https://oshwlab.com/utyf/ups-12v

 

It is an OSHW product (open source hardware) so design including schematic is here:
https://oshwlab.com/utyf/ups-12v

The board is a little different; some things have been removed, and some things have been added. No problem, I hope it works. Thanks.

 

correct, they are not exactly the same, which can be seen from version numbers and slight changes in layout. but they are VERY similar (drop in replacement). only details are changed. for example instead of single larger package (U3 on your board), linked version (rev4) has pair of smaller MOSFET packs wired in parallel (U5 and U6). instead of dual color THT LED, there are two discrete LEDs on board. some values are slightly different (As expected from something that has been refined to get V4.x).

but ... based on what you were asking for, this is a jackpot.

 

correct, they are not exactly the same, which can be seen from version numbers and slight changes in layout. but they are VERY similar (drop in replacement). only details are changed. for example instead of single larger package (U3 on your board), linked version (rev4) has pair of smaller MOSFET packs wired in parallel (U5 and U6). instead of dual color THT LED, there are two discrete LEDs on board. some values are slightly different (As expected from something that has been refined to get V4.x).

but ... based on what you were asking for, this is a jackpot.

Yes, I noticed it. What do you suggest I use: the linked version's design or stick to the original design? The main problem is that the parts aren't available everywhere. Also, currently I am working with the original design. I bought some of them, and they are working as expected for my project.

 

that is the choice you need to make yourself. i cannot solve all worlds problem. even if i could, you did not state where you are and what sources you use.

i often use JLC and change designs so that it can work with parts that JLC stocks. that way i can order assembled boards. PCBA does not cost much and parts tend to be a lot cheaper than what i would normally be able to get through main distributors (Mouser, DigiKay, Newark...).

at any rate, all of the parts seem to be ultra low cost anyway. what do you think my time is worth?
now that you have schematics, you can see how things work and if needed make relevant substitutions or lookup schematics of earlier designs or reverse engineer board you have. the way i see it xr2681 is not readily available so it may need to be substituted.