Electronics > Projects, Designs, and Technical Stuff
"over current" use of a Pulse transformer - ( or an alternative )
<< < (3/10) > >>
2N3055:

--- Quote from: floobydust on December 21, 2018, 08:52:02 pm ---Why is there no isolation (voltage) rating for the transformer?

--- End quote ---

Withstanding Voltage: Compliant with IEEE 802.3, Impulse 2400V 1.2/50μs

If you look into datasheet, you will see that current curve is flat 600mA from 0°C to 70°C at which point temp derating starts.
600mA is probably not thermal bound but defined by core saturation. It will have a security factor, but how much, you will have to characterize yourself.
But I will speculate it won't be 60% more...
mrpackethead:

--- Quote from: 2N3055 on December 22, 2018, 09:35:59 am ---
--- Quote from: floobydust on December 21, 2018, 08:52:02 pm ---Why is there no isolation (voltage) rating for the transformer?

--- End quote ---

Withstanding Voltage: Compliant with IEEE 802.3, Impulse 2400V 1.2/50μs


--- End quote ---
I did see that somehwere but then it went missing on me.


--- Quote ---If you look into datasheet, you will see that current curve is flat 600mA from 0°C to 70°C at which point temp derating starts.
600mA is probably not thermal bound but defined by core saturation. It will have a security factor, but how much, you will have to characterize yourself.
But I will speculate it won't be 60% more...

--- End quote ---

 i've only got little knowledge of transformers.     Since the current flow in each side of the primary is towards the center tap ( opposite to each other ), won't the magnetic field cancel the other side out?
Zero999:

--- Quote from: mrpackethead on December 22, 2018, 12:19:29 pm ---
--- Quote from: 2N3055 on December 22, 2018, 09:35:59 am ---
--- Quote from: floobydust on December 21, 2018, 08:52:02 pm ---Why is there no isolation (voltage) rating for the transformer?

--- End quote ---

Withstanding Voltage: Compliant with IEEE 802.3, Impulse 2400V 1.2/50μs


--- End quote ---
I did see that somehwere but then it went missing on me.


--- Quote ---If you look into datasheet, you will see that current curve is flat 600mA from 0°C to 70°C at which point temp derating starts.
600mA is probably not thermal bound but defined by core saturation. It will have a security factor, but how much, you will have to characterize yourself.
But I will speculate it won't be 60% more...

--- End quote ---

 i've only got little knowledge of transformers.     Since the current flow in each side of the primary is towards the center tap ( opposite to each other ), won't the magnetic field cancel the other side out?

--- End quote ---
No, because the current doesn't flow from both sides of the tap simultaneously. It alternately flows from each side to the tap.
T3sl4co1l:

--- Quote from: Hero999 on December 22, 2018, 02:36:49 pm ---No, because the current doesn't flow from both sides of the tap simultaneously. It alternately flows from each side to the tap.

--- End quote ---

:-DD :-DD

Sorry but there's not really much I can add... it's a linear circuit, currents don't simply stop and start, it's a superposition of continuous, variable currents where that continuity includes values of zero and negative. :)  Also, the only nonlinearity we expect in the circuit, results in greater current flow, not lesser, nothing to make it discontinuous.

Tim
mrpackethead:

--- Quote from: T3sl4co1l on December 21, 2018, 08:48:00 pm ---Can you get individual toroids (single Ethernet lane coupler) and use both sides, same as this part?

--- End quote ---
I have not found any if they in fact exisit.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod