This project is a high-power DC load switching system built using an STM32 microcontroller. It is designed to control and monitor a 2000W load (e.g., LED or heating element) powered by a 40V DC supply. The system includes protection circuits, a buck converter, thermal sensors, and a logic-level MOSFET for switching.
- Accepts 40V DC input
- Steps down to 36V via XL4016 buck converter
- Supports up to 56A continuous and 100A peak load
- Controlled by STM32F103C8T6 microcontroller
- 4–6 NTC thermistors for temperature monitoring
- MOSFET switching using logic-level IRLZ44NPBF
- Protection: TVS diode, PTC fuse, flyback diode
- Fully documented PCB design in EasyEDA
-
Power Input & Protection
- XT60 input connector
- TVS Diode (P6KE43A)
- PTC Fuse (MF-RX050)
-
DC-DC Converter
- XL4016E1 Buck Converter
- Converts 40V → 36V
-
MOSFET Load Switching
- IRLZ44NPBF controlled by STM32 GPIO
- 1N5822 Schottky for protection
-
Thermal Monitoring
- Up to 6 × 10kΩ NTC sensors
- Read via ADC pins on MCU
- EasyEDA – PCB design
- STM32F103C8T6 – Microcontroller (Blue Pill)
| Folder/File | Description |
|---|---|
/hardware/ |
Schematics, PCB layout (EasyEDA) |
/firmware/ |
Source code for STM32 control logic |
README.md |
Project overview |
BoM.csv |
Bill of Materials |
images/ |
Block diagram, PCB render, etc. |
- Upload STM32 firmware code
- Add temperature-based shutdown logic
- Finalize enclosure design (optional)
- Test real-world load performance
This project is open-source under the MIT License.
- STM32CubeIDE and PlatformIO communities
- EasyEDA for PCB layout
- Open hardware and DIY electronics communities