Yes I have and that is manifestly not the problem. The problem seems to require both a 30 VDC Input and an 480 VAC Input on the same pair of pins. That implies a transformer and the transformer will in fact block the DC voltage. You're just changing the problem to fit your experience instead of listening to the TS/OP requirements. You might want to pick your knuckles up off the ground. It is time to put up or shut up.
Okay? let's look at this from the technical standpoint being I have no idea where you are coming from with the need for an iron core AC only transformer up front of the conversion system.
A typical line powered SMPS takes AC current rectifies it to DC then converts that to high-frequency AC then steps it up or down ad required then rectifies it to DC again.
Is there any reason DC can't be fed to the input rectifiers AC side thus making its input universally tolerable to any AC or DC input at any given time so long as the input voltage is within it's working range?
What if we just called it a 24 - 480 VAC to 24 VDC 10 amp SMPS based converter? Would that make any difference opposed to calling it a 30 - 700 VDC to 24 VDC 10 amp SMPS based converter??
Say I have a common universal voltage SMPS based power pack that runs on anything between 85 and 260 volts AC power. Is there any reason by your logic that I can't simply put DC power between 120 VDC and 370 VDC into it being it's already taking that AC input and rectifying it to DC at that voltage anyway?
Also, where did the OP say it had to be an iron core based transformer system? He referred to TDK Lamda power supply bricks which most of their models are SMPS based and not iron core transformer based linear units which I take to imply that SMPS based conversion is more than acceptable and pretty much necessary if a wide input voltage range of both DC and AC power is expected.
What more info do you need from me?
If you know how SMPS units work and how multi-tap iron core transformers work then it shouldn't be too much of a step to envision how a multi-tapped high-frequency transformer in a SMPS based system could be designed and implemented to cover a much wider than normal supply voltage range?
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