Today's "duh" moment: turns out you can use any switching buck converter as a voltage inverter by just swapping Vout and GND.
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And the output isn't isolated.
It's common ground. You treat Vout as GND on both sides. Converter must be capable of total (V+) - (V-) as Vin. https://www.maximintegrated.com/en/app-notes/index.mvp/id/3844 …
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Ah neat! I think I understand now.
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It's funny how voltage is relative but us humans can't make any sense of it once GND stops being GND :)
End of conversation
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