An ideal transformer does work with DC.
A real life transformer can't transmit DC because the core eventually saturates (primary inductance isn't infinite therefore magnetizing current increases until the core saturates).
In your example if we assume no saturation then it will transmit your 5V DC.
In real life it will also transmit a pulse if the DC input ramps from 0-5V fast enough (this is how pulse transformers work).
In both your questions it comes down to this: If the core is saturated it won't transmit anything and it should be saturated if DC has been applied. If it isn't saturated then it will be transmitting 5V DC to the 'second primary' and the secondary (there is no distinction between those two). And therefore you can't drive any other winding with your pulses without it effectively causing a short.
Hi,
If you apply DC... then there will be output.
(So far this is true for ideal transformers)
In real world it is "saturation" that degrades the output signal.
Without saturation .... there still will be an output signal.
Klaus
If you try and apply this 2nd 0-5V rising edge in the opp direction you are effectively applying another source in series - effectively a large short circuit - the load currents will be infinite ( in practice limited by Source and Tx Z's ) the first source would have the higher current as it started earlier and has Imag.
YES, but only theoretically with an infinite big core.So a big transformer core that is saturated less easily, would allow DC to pass from the primary to the secondary?
That's really new to me, if I understand this ok!
I know what you mean.You could then back-calculate how long such a transformer can pass DC by taking
So a big transformer core that is saturated less easily, would allow DC to pass from the primary to the secondary?
Not to disagree but to add: my preference is to understand AC as DC that just happens to eventually change polarity sometime in the future.
It all depends on frame of reference really. DC is only DC over a small enough timeframe (since no DC is actually infinite). And AC is only AC over a sufficiently long time frame (to a 100Khz SMPS transformer 50hz might as well be DC).
So I don't mind calling a known finite pulse DC. At any instant all signals are DC in my view.
and this is bourne out in the behaviour of materials over freq every time - somewhat at odds with logic but apparently true ...
looks to be ASDF44's view, not your view ..." At any instant all signals are DC in my view"
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