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What version allowed the sim to run without stalling? I am now using 24.1.8, and the sim stalls after a different number of microseconds , depending on which tweak I have made to the .ASC.? I don't tweak the Spice settings, like Gmin and Abstol.? I let it run for minutes and the stall did not resolve. The expanded netlist shows a huge number of reports of 'simulation tolerance relaxed' between time points that are small to begin with and eventually appear identical at 17 significant figures. It looks to me that some sort of error message should appear, rather than the stall just persisting.

On Tue, May 6, 2025 at 02:08 PM, John Woodgate wrote:

... But the simulation still stalls without an error message after less than 1 ms.

My simulation did not stall.? It is somewhat slow and I did not wait 100ms for it to finish, but it never stalled.? That might be because of different Control Panel settings, or it might be because of different LTspice versions.? My simulation had plenty of "Heightened Def Con" warnings, which are not a good sign.

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As far as I can see, your switching waveforms allow each pair of series FETs to be on together, briefly, which is not good.

That is the short-circuit current (sometimes erroneously called crowbar current) through the FETs, and can be the cause of much of their power loss which is where about 130 watts were lost.? Switching transistor circuits should be designed with non-overlapping drive signals so that it won't happen.

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Andy

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