Hi I want to know what is the meaning of MOV.I have seen them on power supplies.What is the purpose of using them?
What is MOV!
Hi I want to know what is the meaning of MOV.I have seen them on power supplies.What is the purpose of using them?
Google is your friend, see Electrical Engineering: Metal Oxide Varistor (MOV), metal oxide varistor mov, impedance mode
The "real" world, for all practical purposes, is seldom more than 24 bits wide.
OK thanks.
Let say I have a transformer power supply.
230VAC/12VAC out.I use a bridge,smoothing cap & a 7805 to regulate & take 5V DC out
Where is the best place to add a MOV?I'm mounting this power supply to a plastic box.
Varistor - Wikipedia, the free encyclopedia
Looking this information up for yourself before posting is generally a good idea.
Last edited by Sceadwian; 25th November 2009 at 02:58 AM.
"Because I be what I be. I would tell you what you want to know if I
could mum, but I be a cat and no cat anywhere ever gave anyone a
straight answer, har har."
It doesn't have any diagram how to connect to a power supply.
If you can't figure out where a MOV might be useful in connecting to a circuit for surge suppression after reading the available information on Google and Wikipedia you have no business working with line voltage.
"Because I be what I be. I would tell you what you want to know if I
could mum, but I be a cat and no cat anywhere ever gave anyone a
straight answer, har har."
I am curious why you are asking this question… why do you think you need them?
You’re playing in what could be a dangerous area. You typically put them in three places:
The + to Common,
The + to Earth and
The Common to Earth.
(Some people just put them only across + to Common)
Now having said that YOU MUST BE CAREFUL OF THE VALUES YOU SELECT AND THE DISSIPATION YOU ARE ANTICIPATING TO SURPRESS.
Remember basics here. At 230 VAC = 260v PEAK. So without surges, Your voltage peaks at 262.43V ( 230 x 1.414).
Hope this puts you in the right direction.
Floyd
Thanks Floyd,
But I thought they were putting to 230V side.I'm thinking like this.
Live to Earth
Neutral to Earth.
Is this correct?
Yes you can omit the one across Live to Neutral if you like.
That is up to you.
You should research your needs to decide how much protection you will require. Remember these MOVs are simply to protect your circuit. You could overkill protection needs. Safety is a primary goal and protection of you circuitry is secondary.
Floyd
I've knocked up a drawing to show how I use MOV's and suppression caps.
All quite simple. The MOV goes across the Live and Neutral, and the caps across Live and Neutral, and also Live to Earth and Neutral to Earth.
Be careful playing with line voltages, you rarely get a second chance if you do things wrong!!!
====
Shax.
====
A bus station is where a bus stops...
A train station is where a train stops...
On my desk I have a work station...
Nuff Sed!!!
