Thank you so much for taking the time to help me. I truly appreciate it.?
Can you please tell the purpose of ADuM3190-chip . this circuit is quite complex for me to understand as I am undergraduate student . how did you give pulse to mosfet surely from UC3875 gate driver but how you put PULSE command i can't understand how did you manage the switching frequency? at 30kHZ? can transformer work without this ADuM3190-chip?. .
Also i want to make the PCB of this circuit in KICAD software if you have any idea how can i design this transformer do i have to place the ADuM3190-chip in my pcb??
Thanks in Advance?
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1. The ADuM3190-chip was used to regulate the DAB-Converter. Open the datasheet to see what is inside the chip. This chip is operating much more linear, compared to other regulator configurations, such as
the combination of "voltage reference, together with an OP-Amp + Optocoupler". The optocoupler is known for it's nonlinearities and therefore more complicated to stabilize the converter.
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?? ?I just used the ADuM3190-chip to show an alternative solution. Its use is not mandatory, you don't need it.
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It is assumed you want to use the Transformer for isolation purposes, right?
In that case the regulation feedback loop needs to have an isolation as well.
Another alternative, for which an isolated regulation loop can be omitted, is the use of an isolated transformer-coupled Driver. In that case you will have the freedom to put the regulation circuitry to any ground point
- output Ground for instance - without the need for an isolated feedback loop. The isolated Driver provides a floating Ground. So, the regulator inside the UC3875 could be directly used for regulation.?
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2. The UC3875 gate driver outputs A,B and C,D can drive a transformer coupled driver or a Low side/-High side driver instead. For simplicity, I used voltage-dependent-voltage sources, which LTspice offers in its library as "e-sources". The switching frequency is accomplished by the R12,C8, connected to the FREQSET-Pin of the UC3875. For more information, pls refer to the datasheet, in which you find a curve for Rt=f(CT, frequency).
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3. The transformer(s) have nothing to do with the ADuM3190-chip at all.
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4. I can't assist you regarding KICAD. As mentioned above, ADuM3190-chip is not mandatory.
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5. For transformer design, pls refer to the following articles
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and
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best regards
Udo
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