Driving a solenoid
Torquewrench
Posts: 28
Hi,
I have a question about driving a solenoid driven penumatic valve, similar to post http://forums.parallax.com/forums/default.aspx?f=10&m=83941&g=83951#m83951.
The solenoid valve is nominally 5V, 2W, and there are no built in diodes, just a coil.
I'm using a BS2SX with an IRF7488 MOSFET. The ultimate power source is a 9V battery, but I started off driving the BS2SX from the INEX-1000 5V source, and the 9V was only connected to the MOSFET. With this setup everything worked correctly.
Since I plan to power everything from the 9V I next powered the BS2SX using the Vin pin from the 9V battery. When I did this the solenoid cycles independently at an irregular interval. I figure something inductive might be going on, but I don't what's really cahnged between the two situations.
What do I need to do so I can drive the whole circuit off of the 9V battery?
Thanks,
Phil
I have a question about driving a solenoid driven penumatic valve, similar to post http://forums.parallax.com/forums/default.aspx?f=10&m=83941&g=83951#m83951.
The solenoid valve is nominally 5V, 2W, and there are no built in diodes, just a coil.
I'm using a BS2SX with an IRF7488 MOSFET. The ultimate power source is a 9V battery, but I started off driving the BS2SX from the INEX-1000 5V source, and the 9V was only connected to the MOSFET. With this setup everything worked correctly.
Since I plan to power everything from the 9V I next powered the BS2SX using the Vin pin from the 9V battery. When I did this the solenoid cycles independently at an irregular interval. I figure something inductive might be going on, but I don't what's really cahnged between the two situations.
What do I need to do so I can drive the whole circuit off of the 9V battery?
Thanks,
Phil
Comments
Dave
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Dave Andreae
Tech Support
dandreae@parallax.com
Http://www.parallax.com
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I don't have a diode but I will get one tomorrow and give it a try. The application is an electronically controlled paintball gun, so the 9V will be the only power source I can accomodate. I tried using a 7805 voltage regulator for the BS2SX and the result was the same bad behavior from the solenoid. Would a different or better voltage regulator make a difference?
Why does separate power supplies solve the problem?
Thanks,
Phil
http://www.parallax.com/detail.asp?product_id=500-00005
Dave
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Dave Andreae
Tech Support
dandreae@parallax.com
Http://www.parallax.com
Post Edited (Dave Andreae (Parallax)) : 8/13/2005 3:07:53 AM GMT
Is there a way to ensure the BS2SX always gets it 50ma and doesn't reset, even if the solenoid draws its 2W (220 mA at 9V), some sort of diode or voltage regulator? Would going to a BS1 help, that is also an option for me.
Thanks,
Phil
Dave
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Dave Andreae
Tech Support
dandreae@parallax.com
Http://www.parallax.com
·
Could you recommend any freeware to do schematics to make communications like these clearer?
Thanks,
Phil
Dave
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Dave Andreae
Tech Support
dandreae@parallax.com
Http://www.parallax.com
·
- Phil
Dave
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Dave Andreae
Tech Support
dandreae@parallax.com
Http://www.parallax.com
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