This idea is what you'd call half-baked, but it looks as though it might have potential.
An LC arrangement has the effect of turning switched DC into a sinewave, going back and forth through it at resonance.
This simulation converts 12 VDC into 100 VAC sine.
The op amp switches an H-bridge in everyday fashion. A real circuit will need a more sophisticated control method. (The simulated switches are a 'cheat' component available in the simulator.)
The op amp detects zero crossings on a small value resistor. This automatically occurs at the resonant frequency of the LC combination. The alternating action may stall if it is interrupted.
This method must be operated with a load. If the load is light, or absent, then massive current builds.
The L & C values need to be selected for best efficiency with a given load. The values can be selected for a target 50 Hz resonant frequency, or 60 Hz, or any desired frequency.
Two loads can be driven. They will divide the power output between them, however.
My simulation shows 83 W peak output. Efficiency is debatable. Parasitic resistance takes a bite out of performance. If you can minimize these resistances, the reward will be greater efficiency as well as greater amplitude at the load.