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Homework Help: Justifying choices of components

  1. May 4, 2017 #1
    1. The problem statement, all variables and given/known data
    I'm currently doing a project involving the build of a switching circuit for an SRM.

    I have to choose a variety of components for each stage of the build. For example, I chose an open collector for the interface device, an optocoupler for the isolation device and an IGBT for the switching device.

    I have to compare different components and then justify why I picked the one over the other.

    3. The attempt at a solution

    Each component I picked would be suitable for the application so how do I justify choosing one over the other? Is there anything I should look for in data sheets that give some components an advantage over the other?
  2. jcsd
  3. May 4, 2017 #2


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    SRM = Switched Reluctance Motor?

    I would argue it's not possible to select suitable devices without justifying one over another.

    All they are asking is why that component is suitable for the application. Why choose a 10A fuse instead of a 100A fuse? There are lots of IGBT, which one and why? What current does the IGBT have to handle? Voltage? Power dissipation? Gain? Package? Price? Multiple sources?
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