| Electronics > Projects, Designs, and Technical Stuff |
| "over current" use of a Pulse transformer - ( or an alternative ) |
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| 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. |
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