Control Solenoïd Valve Proportionally w/166Hz PWM

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To control a solenoid valve proportionally with a 166Hz PWM signal, a power amplifier is necessary since the digital output from LabVIEW can only provide a few milliamps. The solenoid coil, with a resistance of 2.5-4 ohms, requires around 8 amps of power when using a pure DC signal, and the effective current will be higher due to the coil's resistance to current changes. A transistor or MOSFET can be used to amplify the signal, but a dedicated driver may be more suitable, especially for proportional control. The valve operates at 24V and is designed for flow control, confirming its proportional nature. It is advisable to consult the valve manufacturer for appropriate driver options.
Charly Segaert
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Hello everyone,

I have to control a solenoïd valve proportionally using a 166Hz PWM signal. The resistance of the coil is 2,5-4 ohm. If i'd be using a pure DC signal I'd have around 8 amps of power. However this is an oscillating signal. Since a coil resists changes in current, the effective current will be higher I guess?

I want to create this signal using a digital output in Labview. The problem is that I can only draw a few milliamps from the output. Is it sufficiënt to intensify the signal using a transistor or mosfet? Or do I need to find a complete printed circuit with filters,...?

Thanks for your answer
 
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Charly Segaert said:
Hello everyone,

I have to control a solenoïd valve proportionally using a 166Hz PWM signal. The resistance of the coil is 2,5-4 ohm. If i'd be using a pure DC signal I'd have around 8 amps of power. However this is an oscillating signal. Since a coil resists changes in current, the effective current will be higher I guess?

I want to create this signal using a digital output in Labview. The problem is that I can only draw a few milliamps from the output. Is it sufficiënt to intensify the signal using a transistor or mosfet? Or do I need to find a complete printed circuit with filters,...?

Thanks for your answer
Usually a solenoid will be ON or OFF. What is tue purpose of the PWM?

And yes, if you want to use LabView to generate the PWM, you will need a power amplifier. What is the solenoid coil voltage? Can you post a link to the datasheet?
 
berkeman said:
Usually a solenoid will be ON or OFF. What is tue purpose of the PWM?

And yes, if you want to use LabView to generate the PWM, you will need a power amplifier. What is the solenoid coil voltage? Can you post a link to the datasheet?
While I am not 100% sure of the type of valve, there are electrically operated valves that are proportional. More voltage gets the valve farther open. Known as proportioning valves. Common on hydraulics nowadays.
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As to the original question, you will need some type of driver. I would assume the manufacturer of the valve would offer you something. That is if it is a true proportioning valve.
 
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The valve works on 24V and has the function to control an amount of flow, so it is indeed proportional.
Sadly I do not have a datasheet of the coil, it's used very often on high pressure pumps of Bosch.

So I need to search for a drive instead of only using a transistor?

Thanks
 

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