We investigated charge-changing processes (total charge-changing cross sections and partial charge changing cross sections) for light proton-rich nuclei (Ar34-36, Cl-33, Si25-28) at around 300A MeV on carbon and solid-hydrogen targets. We estimated the nuclear proton point radii of Cl-33 and Si-25,Si-26,Si-27 from the observed total charge-changing cross sections by using Glauber-model calculations with a phenomenological correction factor. Furthermore, we estimated the proton skin thickness for Cl-33 coupled with its previously observed matter radius. From investigations of the partial charge-changing cross sections, clear zigzag pattern was observed for all isotopes. The present studies suggest that the pattern may be common in the proton-rich side, and depends on the odd even nature of the fragment charge. (C) 2017 Elsevier B.V. All rights reserved.