Imported from GitHub: Sirawit7205/led-fan-control · commit ed1d2f8 · license CERN-OHL-S-2.0

Description

PCB for retrofitting a cheap rechargeable fan with LED lights

README

LED Fan Controller

This is an open-source KiCAD design files for a retrofitting controller for cheap rechargeable USB fan with LED lights.

This board is an upgrade (I hope) for the old control board for lead-acid battery that broke down.

Pictures

Features

• 1A Charging via USB Type-C port or external 5V power.
• BQ25185DLH Battery charger IC
• BQ29701DSE Battery protection IC with extremely low RDS(on) MOSFET pair
• TPS61088RHL Boost converter from Vbat to 8V motor voltage
• DRV8876PWP Brushed DC Fan driver
• MCU control for fan and led levels.

Revisions

We are currently at Revision 1. Changelog is below:

Revision 1 (July 2024)

• Initial Design
• Does work, but the Power Path feature on BQ25185DLH is not suitable for high current without cooling. Hits thermal limit in a few minutes.
• Need to switch to another conventional 1A charger IC.
• May need to remove DC jack connector as the existing board in the fan is not that good at handling the current.

What is provided

The schematics, PCB design, and an interactive BOM is provided.

Hardware is licensed under SPDX-License-Identifier: CERN-OHL-S-2.0

Software is licensed under SPDX-License-Identifier: GPL (Firmware is WIP and will be uploaded later.)

Documentation is licensed under SPDX-License-Identifier: CC-BY-SA-4.0

Ordering

You can export gerbers from this project and order the board yourself. You can also use the link below to directly order from Aisler. https://aisler.net/p/YHUKIBMT

Credits

• AMPLF0630 inductor model by Aleksey Zablotskiy: https://grabcad.com/library/amplf-mpc-aspi-etc-smd-power-inductors-1
• miniSMDC150F fuse model by Karol Novak: https://grabcad.com/library/minismdc150f-1
• QFN packages model by Jason Traud: https://grabcad.com/library/qfn-packages-1
• WSON-10 package model by Alex SAR: https://grabcad.com/library/sda10a-rev-a-wson-10-1
• USB Type-C 6-pin SMD model by ni_ni: https://grabcad.com/library/usb-type-c-smd-6pin-1
• VQFN-20 package model by Cristian Deenen: https://grabcad.com/library/vqfn-20-3x3mm-1