why are so many base terminals un-connected?
Each gate is connected to an IGBT gate driver IC powered by a separate isolated DC-DC-converter. All (5) gate signals are generated by an Arduino and pre-amplified before being sent to their respective gate driver IC. This part is verified to operate as expected. The state changes are described in the PDF.
BradtheRad, thanks. I have updated the schematics. it is unclear to me how you suggested to connect C19. I have added the description section to the attached PDF explaining the switch states and the intended use of C19 as an energy recovery capacitor. it is unclear to me where to put the two extra diodes you suggested for separation. the left side should charge the capacitor on the right side and vice versa, so they should not be separated. what is needed to discharge correctly, recover the undissipated energy, and re-use it in the next charge cycles?
new PDF attached.
You connected C19 correctly.
Here is a simulation of your twin interleaved charge-pump voltage doubler.
I believe you are describing a 17x voltage multiplier.
With two capcitors switched between series and parallel circuit, you can maximally achieve voltage doubling, but nothing beyond.
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