power_board

1. The DC-DC power supply uses a BUCK topology and an STM32G431 as the main controller.
2. The CH224K decoy chip can easily extract up to 20V from chargers or power banks that support PD fast charging.
3. Interaction is achieved via an LCD screen and rotary encoder. The LCD homepage displays the target voltage, current, switch status, actual output voltage, current, and power. A long press enters the menu settings page, where the PD-induced voltage can be adjusted, and voltage, current, and temperature calibration and viewing functions can be performed. A power statistics function can be added later.
4. When the actual current is less than the target current, it is in constant voltage output mode, and the constant current indicator is off. When the actual current is greater than the target current, it is in constant current mode, with the constant current value being the target current value, and the constant current indicator is on. This mode is very convenient for charging batteries.
See the demonstration video on Bilibili: BV1zr421p7jG