Capacitorless solid-state power filter for single-phase DC-AC converters

https://ieeexplore.ieee.org/document/10640369

"converters rely on passive filtering due to high-frequency characteristics, but susceptible to wear-out/ failure... generate sinusoidal ac voltage without relying on capacitors... filter composed of planar transformer and H-bridge converter operating at high frequency, injecting voltage harmonics attaining sinusoidal output voltage... total output voltage harmonic distortion below IEEE 519 standard... topology reduces the passive components used for filtering"