Hi Dave,
great to hear from you! I took a lot of inspiration from Jaromir's schematics and if I remember correctly he had a lot of 10k (single) resistors in his schematic, so I don't want to take credit for this approach necessarily. I probably have changed a few things a bit and found very convenient to use Vishay's 10k ACAS precision resistor networks wherever possible. The IM circuit is full of 10k's as well, even though I'm looking for a gain of 2 => 20k at one point, but that is what networks are for, I guess. I attached a PDF of the current version of my schematics.
Right now I still try to figure out how to do the grounding. I don't fully understand how I would implement a star ground approach (Kleinstein hinted at, probably rightly so) properly in a two-converter design. This is also where AD' application notes state that for multi-converter designs star ground is not possible and in a
strict sense it simply isn't. They also admit that a solid ground plane may not always a good idea, but fail to point out concrete solutions. A few examples of well working and poorly performing examples with explanations would go a long way. So if you like to share some advice on how I could proceed - I'd certainly appreciate it
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Haven't thought about any guard rings etc. in great detail, although I briefly discussed it with Jaromir. Besides the grounding this is the other part that I still have questions about in this more complex circuit. As a power systems EE, these topics are a bit outside my area of expertise/experience, unfortunately
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- Sebastian