It would be nice to see also a PD Trigger with a cheap MCU which allows to set a target voltage, but with
a buck and boost converter on board, so if the target voltage cannot be negotiated, it will be regulated
trough a buck / boost converter.

Another great application would be adding a charge pump to generate negative voltage. This would
be a great addition to a bi-polar bench power supply for breadboards etc. (e.g. +/- 12V for operational amplifiers).

Maybe I'm mistaken but it looks like you have 2-3 boards that are similar but backwards of what I want. I think they are taking a USB C input and outputting either variable based on 3 switches or max based on whatever the supply can handle, etc.
I am looking for a cheap board to convert my old DC power supplies/chargers into PD chargers for modern devices. I can 3D print housings for the boards, screw or solder input wires and have a usb c port for output.

Any ideas on creating such a board or where to find one if it already exists?

Some of my existing power supplies happen to be the right output voltages for certain applications so I could just wire a usb c cable straight to it but then it'd only work on very specific devices with matching voltage requirements.

Hi,

First of all, thanks for sharing these circuits!
I am mainly interested in the solar charger. As I see it, the battery output feeds directly to the booster circuit. Maybe it would be better to use a P-MOSFET for load sharing, like in LiPo_Charger_LS_TP4056. See considerations here and here.

Hey, first off: Thanks a lot for these boards! They are a great reference for newcomers, me included. I especially like the explanations of design decisions and the clean schematics.

That said, can you offer some advice on when to use which design? I roughly understand how they work, but I can't really say if I should use a TP4056 based board, one with a MCP73831 or one of the all-in-one chips like the IP5306. Are newer boards just better?

Another nice addition would be some kind of checklist on which ones need protected cells and which one doesn't. I think most of these boards need protected ones, but it's difficult to say if some of the chips include protection.

If you need some use cases, here are mine:

• Dock Mode/UPS: mostly plugged in, but offers battery backup for a few hours. Needs power path and ~1A max current. Turned on only a few hours a day or always on.
• IoT Sensors: Charge every few months, which can happen without power path. Focus on low I_q , always on.
• ..?

Looking at the pictures, the inductor is nearly as wide as the circuit board which is about 10mm. However the documentation for the PSPMAA0402-4R7M-ANP inductor indicates that it is only about 4.5mm wide which would be a problem with the pads I think. Am I missing something here?

Jerry

Hello, I would really like to use this module for recycling old power supplies to charge USB-C.

I tried to make a test batch of boards with JLCPCB but the inductor (JSHC0650H-220M-G) has been out of stock for many months (and is not even listed on LCSC any more). As an alternative, I selected a substitute (C497873) but the board heats up like crazy (80c+ in some parts) when charging a standard phone with about 6-7w. I'm guessing the DC resistance is not low enough, but I couldn't find anything in the same range as the original part.

Could you suggest an alternative inductor for this design that is available?

Thanks for sharing these projects, I've learned a lot studying the designs!

I realized that there is few sources of boards around internet for this purpose, and that is how I found this repo, amazing work I must say!

I think there would be a nice chance more people end up here looking for a LiFePO4 MPPT charger with Load connectors at 3.3V since there is many boards for DIY projects that would happily and very efficiency run directly from it (ESP32 family for example).

Would be as simple as taking the existing out? I would like to give a try but I'm not so familiar with PCB design itself, would like to confirm first.

Hi thank you for making these files and schematics available! Do you have any suggestions on part numbers that should fit with the existing layout for the USB PWR CONNECTOR on the LiFePO4 PowerBoards? Thanks!

The reference implementation in http://www.injoinic.com/wwwroot/uploads/files/20200221/0405f23c247a34d3990ae100c8b20a27.pdf shows the resistor between BAT and the battery connector, but https://github.com/wagiminator/Power-Boards/blob/master/LiPo_Power_Board_IP5306/LiPo_Power_Board_IP5306_schematic.pdf has R4 towards ground. There are also a few deviating values.

I'm not sure if I'm missing something or if this is an actual mistake, feel free to close if the former. Could you give a few details on why you chose these values? I'm not finding accepted value ranges or external part specs.

In LiPo_Charger_LS_TP4056_schematic.pdf we can see the power path doesn't have USB charger 5v as input. Maybe I'm wrong but shouldn't be the load supplied by the charger will the USB cable is connected?