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modify pc psu and inverter w/12v relays

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=89725
Printed Date: May 06, 2025 at 2:56 PM


Topic: modify pc psu and inverter w/12v relays

Posted By: silverdrgn
Subject: modify pc psu and inverter w/12v relays
Date Posted: January 28, 2007 at 11:53 PM

Hello everyone. I am a fairly new member with about the same time in electronic design. I am looking for a simple way to modify a power inverter and PC power supply to be able to turn the pc on and off without damaging pc components when in my car. I have seen such devices being sold at other places but the prices are pretty high for something that a couple of relays can do. (from what I have read/understood)

I understand that the relay is a very handy and useful tool in the automotive industry. Also from what i understand it can easily be used to accomplish such a task.

The desired outcome is Either when signal from remote start or remote alarm or car ignition in "on" or "AUX" is activated the inverter turns on and powers the pc.

When vehicle turned off, a type of timed relay allows the pc 5-10 minutes to shutdown. (I know 5-10 minutes is pretty lengthy for a shutdown but within those 5 minutes if the vehicle is powered back on or put in AUX it would be nice if the controller would bypass the shutdwon and leave the power to the pc on)

Like I mentioned I have the PC Power supply and inverter but have no idea how to modify these to do this or if there is a cheaper alternative to buying an expensive controller for them to do such. By expensive I mean 50 to 100 Bux. I don't want to sound cheap but I don't know how much work goes into putting something like this together. Thanks In advance for any help/suggestions.

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My brain threatens me all the time.



Replies:

Posted By: hotwaterwizard
Date Posted: January 29, 2007 at 12:11 AM

What you want can be done with a relay and a transistor a capacitor and a couple of resistors and a diode. You will have to play with the values of the 33k and the Capacitor.

When this circuit is activated it will stop the timer as long as the reset is pushed in. It the reset is open the timer starts counting down again. A relay can be substituted for the push switch.

posted_image



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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !



Posted By: hotwaterwizard
Date Posted: January 29, 2007 at 12:15 AM

Here is the same circuit with the second relay.

posted_image



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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !


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