relay coil inductance

AlwaysWrong should read it! Especially the part about the clamp diode.

John

=A0 =A0 =A0 =A0 =A0...Jim Thompson

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When was the last time you ever saw a relay double flop?

Never.

Also, you stupid twit, the word "clamp" is not even in the document.

That's one of them, there's one that describes using a zener as well as a back emf diode to prevent shunting the spike current back into the coil and slowing down de-latching and one appropriately titled for the thread subject line.

My OP was concerning a relay driver for a custom ASIC on a CMOS process where I couldn't tolerate more than 7V "kick" and flyback diodes are "unobtanium".

Of course the thread had deviated far afield ;-)

Turns out I have no need...the customer accepts the high OFF capacitance of a large PMOS switch.

...Jim Thompson

BTW: My A/C contactors have a magnet assembly to pull the arc out of the contact gap. I understand there are literally contactors that "blow" the arc away ;-)

...Jim Thompson

Jim Thompson a écrit :

A friend of mine is working on 'medium' power 'contactors' (I think at this MW power level there's another word). To open the contacts, they 'coil gun' a metallic mass that slaps the contacts open. You'd better not being on the trajectory. Oh, the device is not designed to be opened under load and it just saves the network once.

In other words, a custom SSR, just like I said.

And those that insert an insulative blade in between them as it opens.

Do you accept that your two previous statements are contradictory?

What would be the purpose of a clamp diode if not to conduct current when the relay drive voltage is instantaneously removed?

Where does that current come from if not from the relay coil?

Do you understand that a relay coil's hold-in current is less than the pull-in current?

Why do you contend that the relay drops out before the coil current falls below the hold-in current?

Why do you behave like an ignoramus?

This person is clearly an expert in such matters.

It probably comes from the toilet cleaning part of his role as a janitor.

He wouldn't know where to start. Besides, to try it for himself, he'd need some equipment. He wouldn't get far with his broom.

Ignoramus is as ignoramus does ;-)

...Jim Thompson

Wait, He made have a degree in this field. No Equipment needed, just sit back put a happy smile on, knowing every one below him will do his work so that he can take credit for it.

Some big breakers blow a supersonic blast of gas, SF6 maybe, into the contacts from a pressurized cylinder. I think there are also explosives used to quench arcs.

John

Actually, I have seen the NO contact open and briefly reclose on some small signal-level relays.

Wrong as always.

John

I always find it funny when a total retard bases his claims of superiority on his fantasy that the other person has some menial job.

Sorry, PomTard, but even a lowly janitor puts a twit like you under the table.

I probably have more electronic test gear than you do.

I'll bet that I spent more time researching in the lab, at the bench, on a breadboard with relays and relay circuits in the last ten years than you have, you mouthy little bastard.