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Bench Talk for Design Engineers

Bench Talk

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Bench Talk for Design Engineers | The Official Blog of Mouser Electronics


Time to Take All This Knowledge to the Next Level
On มีนาคม 4, 2015 in All by Caroline Storm Westenhover
Caroline Storm Westenhover

I am getting to that time in my life, or rather that time in my college career, where I am expected to do a bit more. I now am moving from absorbing information and doing final projects that relate to what I just learned, to tying in what I have learned from multiple past classes and coming up with my own ideas.

Lucky for me my supervising professor didn’t just throw me to the wolves. Instead he gave me over to a PhD student to shadow. Right now he is working on drawing up a proposal to develop a resonant converter. The idea behind it is to set up a known resonant frequency to make soft-switching, switching at zero voltage crossings, easier.

The most common design for a resonant tank in an electrical circuit is an LC tank. An inductor and a capacitor are connected in parallel.

What I found most interesting about this proposal was where the inductance came from for the resonant tank. Inside the circuit is a transformer. Non-ideal transformers have losses due to leakage inductance, both in series with the transformer and in parallel. A non-ideal model is shown in the figure below.

 

 

Standard schematic used for modeling the non-ideal characteristics in a transformer

The interesting idea behind this transformer is that the parallel leakage inductance, called the magnetizing inductance, is being used at the L part of the LC tank. Up until reading through the proposal I had always thought of leakage inductance as this construct that took some weird unexplainable internal mechanism and put it into calculable terms. Never had I thought about it as inductance actually seen at the nodes that could then be put in parallel with an actual capacitor to make a resonant tank.

Now that I have read about it, it makes sense that if there is inductance seen across nodes 1 and 4 then a capacitor connected across nodes 1 and 4 would see the same inductance, leading to the creation of a resonant tank.

I am not sure how I will use this information in my future as an electrical engineer, but I think I will. Now that I have a more accurate concept of electrical models, I am sure I will use it on a weekly basis.



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My name is Caroline Storm Westenhover. I am a Senior Electrical Engineering student at the University of Texas at Arlington. I am the third of seven children. I enjoy collecting ideas and theories and most enjoy when they come together to present a bigger picture as a whole. Perhaps that is why I like physics and engineering.  My biggest dream is to become an astronaut.


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