"Potato Mine Bomb" - Based on Zhirong SW7201 bidirectional fast charging

      The SW7201 is a high-efficiency synchronous 4-tube bidirectional buck-boost charge/discharge controller that supports charge/discharge management of 1-4 batteries, supports I2C control, and can provide a maximum power output of 100W. This project uses the SW7201 as the lithium battery management chip and the HSUB238 PD decoy chip to fast charge the lithium battery. It can also output 20V5A/100W of energy, enabling charging of electronic products such as laptops and mobile phones when you are out and about.
     SW7201 Chip Introduction:
 High-Efficiency Buck-Boost Switching Charge:
➢ Supports buck-boost charging of 1 to 4 lithium batteries, including complete charging cycle management
➢ Supports 3V-19.2V charging target voltage setting, supporting various types of lithium batteries
➢ Supports 100W input power
➢ Supports 4V-24V input voltage
➢ Supports I2C programmable control of input/battery current limiting
➢ Seamless switching between boost and buck
 

Reverse Buck-Boost Discharge:
➢ Supports 100W output power
➢ Supports 3V-22V output voltage
➢ Flexible selection of FB/I2C voltage regulation
➢ Supports I2C programmable control of output current limiting
➢ PFM/PWM mode automatically switches according to load size
 
The chip has a built-in 12-bit ADC.
 
The battery side uses one XT60 model aircraft interface and one DC005 interface, with reserved output pads for connecting other interfaces. The number
of lithium batteries (1-4) can be selected by configuring the BSSTT resistor on the chip; the inductor can be a high-power inductor ranging from 1 to 4.7uH, with different inductor COMP parameters corresponding to different resistors and capacitors.
Currently, four 4500mAh 21700 lithium batteries from Dongci are used as the battery terminals, and the charge/discharge rates meet the requirements.
The physical
 
PD decoy chip HUSB238 decoys 20V input
 
/output
. The accompanying video demonstrates using an electronic load to drive 60W and switching between different voltage levels. If using high-power loads for extended periods, a fan cooling system is still necessary, which will be considered for internal cooling in the future. Since there is only one color silkscreen roll, and black ink is currently being used for color printing, there is concern about wasting ink if the first printout is not done well. With successful verification, color proofing can now be enjoyed. Thanks to LCSC for their support of this event; we have gained valuable experience from this experience.