Electronics > Beginners
How to improve Solenoids open/close response time ?
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Albatroon:
I am designing a board to control Solenoids, I'll use TIP122s to control them.
How I can make them open/close faster ?

I found this circuit online, by adding a zener diode placed in series will improve the the latch-out response.

Source: https://www.theleeco.com/engineering/electrical-engineering/lee-solenoid-valve-drive-circuit-schematics/
Could some one explain how dose this supposed to do so ?
rstofer:
When the solenoid is deenergized, the field collapses into the diode and the current flow through the diode and winding keeps the solenoid engaged until the voltage drops to essentially the Vf of the diode and it ceases to conduct.  Adding a zener diode increases the voltage at which the circuit ceases to flow current through the diodes, releasing the solenoid sooner.
Albatroon:

--- Quote from: rstofer on March 11, 2019, 07:49:58 pm ---When the solenoid is deenergized, the field collapses into the diode and the current flow through the diode and winding keeps the solenoid engaged until the voltage drops to essentially the Vf of the diode and it ceases to conduct.  Adding a zener diode increases the voltage at which the circuit ceases to flow current through the diodes, releasing the solenoid sooner.

--- End quote ---

Thank you for your replay.
Do you have any ideas how to make it open faster?
viperidae:
Increase the voltage if you want it to operate faster
soldar:
You can activate it with twice the voltage and switch to lower holding voltage. You can use twice the rated voltage and a resistor and capacitor. Initially it gets twice the voltage but as the capacitor discharges the volatge settles at a lower point. This is good if the solenoid does not consume great power for long periods of time.
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