But the solenoid is controlled by a microprocessorThe zener protects the Q10 gate from excessive voltage.
Surely the solenoid valve pin 2 should connect to the Q10/Q11 drains, not to the micro control signal /BL1 ?
I think it should connect to the 0V of the 24V supply, presumably this is the earth connection shown on the diagram.Surely the solenoid valve pin 2 should connect to the Q10/Q11 drains,
Thanks! That looks a handy chip. It's able to low-side drive the solenoid directly and has BEMF protection built in.Here is the datasheet.
Can you provide any data on the solenoid. A part number or datasheet?Good morning, I have found this circuit in a medical ventilator service manual. BL1 is the control signal from the microprocessor.
I did not understand the purpose of the zener diode in the circuit and why two MOSFET are used.
Thank you.
View attachment 228495
Thank youHi
Just a guess on solenoid and mosfet input signal, but seems to work like a hit and hold solenoid driver.
Added D6, but I have to believe it exists.
View attachment 228814
by Duane Benson
by Jake Hertz