## Using Transformers in circuits SOLVED

 I am trying to set the transformer parameters to model a Tamura PL30-12-130B (data sheet available at Digikey.com). According to Tamura's data sheet using the primary and secondary in series configurations, with a primary voltage of 230AC, the secondary should be capable of 12.6AC - 2.4Amps, or 30VA. I created a simple circuit: 230V AC Source connected to the Primary side and a 5.25 ohm resistor on the secondary. Secondary at 12.6 volts (n=18.25) should be 2.4 amps, which matches the specs from Tamura. My circuit is Public here: Transformer-230-12p6 The T-D simulation provides voltages (peak primary and secondary) and peak secondary current that seem correct, however the primary current is far in excess of anything normal. For a simple step down (18.25:1) transformer like this, I would expect a Primary current of approximately 130mA RMS (or roughly 183mA peak) for a secondary current of 2.4A RMS, NOT primary peaks of 16 Amps. Can anyone help me to understand what is incorrect in my transformer model parameters? by jaf2009 September 02, 2020 Thanks for the insights, EF82. Very interesting food for thought. We are accustomed to view the world at the macro level, yet in the timing parameters I was asking for the micro level. Curiosity led me to pull some Littelfuse Data sheets on their "Fast Acting" fuses. A 2 Amp fuse could process 18A for .01 sec - longer than those peaks. Hence, at the macro level - No Blow! Ok, I have a transformer - 230VAC RMS to 12.6VAC RMS - and I am trying to view the circuit from that view. RMS is by definition a mean over time. I am new to simulators, and very much a Bob Pease (Linear Technologies) type - plug in the real components and let them talk! I have used that approach for many successful designs, but now I would like to add simulations to my bag of tricks. How do I get the simulator to talk to me and present results at more of the macro level?? I think I need to somehow tell the simulator to present RMS type results, no?? I would very much appreciate your efforts in helping me in this learning process. by jaf2009 September 03, 2020

 This is very helpful, EF82. The Laplace Block opens up a lot of opportunities - I need to spend more time experimenting with it. It certainly looks like this will give me all I need. Many thanks for your time and efforts. John ACCEPTED +1 vote by jaf2009 September 04, 2020

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