Linking secondary ground wires from 3 dc/dc convertors

Basic electrical and electronics, such as DC/Analog control.
collectors
Posts: 64
Joined: Sun Oct 07, 2018 11:41 am

Linking secondary ground wires from 3 dc/dc convertors

Postby collectors » Mon Nov 29, 2021 7:33 am

Hi, i have a 6amp 20v power supply that also runs a 20v to 12v convertor & a 20v to 5v convertor, so 3 voltages on the lay out from 1 power supply.
Now i have some 5v IR sensors that i wanted to use to switch a 12v relay panel using a low signal. So i connected everything up & the 5v IR,s would not trip the 12v relays with a low signal. So i tried linking the ground wires on the secondary side of the 5v & 12V convertors & hay ho all worked fine.
But is this ok to do & should i think of connecting all grounds together on the secondary side of all 3 voltages. Thanks

User avatar
Flashbang
Posts: 4050
Joined: Thu Oct 18, 2007 1:07 pm
Location: SE United Kingdom
Contact:

Re: Linking secondary ground wires from 3 dc/dc convertors

Postby Flashbang » Mon Nov 29, 2021 10:24 am

So long as the power supplies are separate or each supply comes from a separate winding or as in your case all three supplies come from one source then linking all the Ov together is fine.
Its normal to do this on most electronic circuits and especially those that use active low switching.
[Image << Click the Icon to go to my website
Broken? It was working correctly when I left it.

collectors
Posts: 64
Joined: Sun Oct 07, 2018 11:41 am

Re: Linking secondary ground wires from 3 dc/dc convertors

Postby collectors » Mon Nov 29, 2021 11:10 am

Many thanks Brian. Wasn't sure if i needed a diode or similar to keep them apart.

User avatar
Flashbang
Posts: 4050
Joined: Thu Oct 18, 2007 1:07 pm
Location: SE United Kingdom
Contact:

Re: Linking secondary ground wires from 3 dc/dc convertors

Postby Flashbang » Mon Nov 29, 2021 11:31 am

No, no diodes needed :D
[Image << Click the Icon to go to my website
Broken? It was working correctly when I left it.


Return to “Electrical & Electronics”

Who is online

Users browsing this forum: No registered users and 5 guests