bms-c1 icon indicating copy to clipboard operation
bms-c1 copied to clipboard

Published 20 hours ago • verified publisher icon LibreSolar

What dose this P-MOSFET do?

Open shivanshumahim opened this issue 2 years ago • 2 comments

Hi, I am trying to understand the significance of this P channel MOSFET (Q9) in the Power section of the BMS. libre_solar_issue

I want to understand it's significance in both charging and discharging condition. I made a Falstad simulation with 1 discharge N MOSFET (Q5) and the P MOSFET. Relevant switches can be used to put the simulation in Charging/Discharging mode. Simulation is in this link.

Also, in case of charging, current flows through Q5 (disabled body diode) , but I am unable to understand how that N MOSFET is turned on. The Vgs and Vds doesn't make sense to me. Screenshot 2022-03-10 131408

shivanshumahim avatar Mar 10 '22 07:03 shivanshumahim