Solenoid valve (version 2) - Electronic Circuits Projects Diagrams Free

leonel · 15th February 2006, 04:04 PM

Hi.
I have one (big) problem...
It's the follwing!
I want to control (open / close) a solenoid valve (latching model).
To do this i have to invert polarity in the coil (minimum energizing time is 20ms)
I have a +12V signal - in the positive transition i want to close my valve and in the negative transition i want to open my valve. So what i have to do is shown in the figure.
Why i choose a valve latching model? It's because my system is supplied by an +12V battery.
Please help me in a circuit to do this...
Regards

jrz126 · 15th February 2006, 06:00 PM

what are you using to drive this solenoid?
I would think you'd be able to get away with a DPDT momentary switch that switches the polarity to the solenoid.

Russlk · 15th February 2006, 11:32 PM

This circuit does not use the latching property of the solonoid. Some power could be saved with a pulsing technique, but that was not a design parameter. This circuit will handle up to 250 mA solonoid current.

hotwaterwizard · 19th February 2006, 01:47 AM

A Bit Low Tech but try it.
Uses Standard Automotive Cube Relays.

ljcox · 19th February 2006, 02:20 AM

Here is an alternative

hotwaterwizard · 19th February 2006, 02:22 AM

HERE IS ANOTHER

hotwaterwizard · 19th February 2006, 02:23 AM

ANOTHER

hotwaterwizard · 19th February 2006, 02:26 AM

ONE MORE

leonel · 20th February 2006, 06:14 PM

Sorry to be out so long...
It can't be with switches, because what i have is a +12V, produced by a PIR sensor and a timer.
The PIR sensor is there to detect motion and when mention is detected i have to open my valve (water starts running) and when stops detecting my valve closes (water stops running). I have to suplly all system with a 12V battery. Power saving should be a design parameter (that's way i use latching property)

Roff · 20th February 2006, 08:24 PM

Quote:

Originally Posted by leonel

Sorry to be out so long...
It can't be with switches, because what i have is a +12V, produced by a PIR sensor and a timer.
The PIR sensor is there to detect motion and when mention is detected i have to open my valve (water starts running) and when stops detecting my valve closes (water stops running). I have to suplly all system with a 12V battery. Power saving should be a design parameter (that's way i use latching property)

I haven't tested this, or even simulated the entire circuit, but I think it should work. I did do a timing diagram, so it wasn't pulled out of a hat, and I simulated the H-bridge portion.
Tell us how much current the solenoid requires and I can recommend MOSFETs.
It will draw no power except during about 30ms each time the solenoid switches, and then the only significant power dissipated is in the solenoid.
You can add 10k each across D2 and D4 if damped oscillation (ringing) is a problem for some reason (which I doubt).

Russlk · 20th February 2006, 10:53 PM

Here is another circuit. If you use CMOS 555s, the standby current will be minimal. The one shot time is 15mS which I estimated would be sufficient to flip the solonoid.

hotwaterwizard · 21st February 2006, 04:10 AM

Hmmm a water valve?

leonel · 21st February 2006, 08:18 AM

I need 20ms to switch my valve.
I did a similar circuit Ron advise but i will test Ron H. circuit.
Alse i will test Russlk circuit then i'll tell the result.
Thank's

leonel · 1st March 2006, 02:37 PM

Hi.
I've tested Ron H circuit and works fine. The problem his that i do not have mosfets in stock. Can i do this with transistors? I tried with BC546 and didn't work... The corrent i need is +-40mA and an energizing time of about 20ms.
Thank you.

Russlk · 1st March 2006, 03:41 PM

If you put resistors in series with the transistor bases, it should work. I suggest 3.3K. If the PNPs don't turn off, put in a base to emitter resistor (another 3.3K).

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15th February 2006, 06:00 PM	(permalink)
jrz126	what are you using to drive this solenoid? I would think you'd be able to get away with a DPDT momentary switch that switches the polarity to the solenoid. __________________ Jeff Zimmerman To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.

20th February 2006, 06:14 PM	(permalink)
leonel	Sorry to be out so long... It can't be with switches, because what i have is a +12V, produced by a PIR sensor and a timer. The PIR sensor is there to detect motion and when mention is detected i have to open my valve (water starts running) and when stops detecting my valve closes (water stops running). I have to suplly all system with a 12V battery. Power saving should be a design parameter (that's way i use latching property)

21st February 2006, 08:18 AM	(permalink)
leonel	I need 20ms to switch my valve. I did a similar circuit Ron advise but i will test Ron H. circuit. Alse i will test Russlk circuit then i'll tell the result. Thank's

1st March 2006, 02:37 PM	(permalink)
leonel	Hi. I've tested Ron H circuit and works fine. The problem his that i do not have mosfets in stock. Can i do this with transistors? I tried with BC546 and didn't work... The corrent i need is +-40mA and an energizing time of about 20ms. Thank you.

1st March 2006, 03:41 PM	(permalink)
Russlk	If you put resistors in series with the transistor bases, it should work. I suggest 3.3K. If the PNPs don't turn off, put in a base to emitter resistor (another 3.3K). __________________ see my website: www.geocities.com/russlk