BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
@booklet{EasyChair:10172,
author = {Gael Pillonnet and Mahmoud H.K. Hmada and Patrick P. Mercier},
title = {Normalized Benchmarking of Hybrid Switched-Capacitor DC-DC Converters},
howpublished = {EasyChair Preprint 10172},
year = {EasyChair, 2023}}