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In this article, a piecewise affine (PWA) switching surface with active border tuning of affine sections, called the Partition Border Tuning (PBT) controller, is proposed for DC\u2013DC series resonant converters (SRCs). Lyapunov stability analysis is used to ensure closed\u2010loop stability. A new Chattering Mitigation (CM) technique is proposed to suppress unwanted oscillations between modes and output voltage overshoot under transient conditions, which are generally present in conventional switching surface controllers. This technique eliminates chattering, reduces output voltage overshoot and limits the maximum inductor current and capacitor voltage amplitude of the resonant tank under transient conditions. Simulation and experimental data are presented to demonstrate the effectiveness of the proposed approach.<\/jats:p>","DOI":"10.1049\/cds2\/9961947","type":"journal-article","created":{"date-parts":[[2026,1,31]],"date-time":"2026-01-31T14:42:42Z","timestamp":1769870562000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Partition Border Tuning and Chattering Mitigation for DC\u2013DC Series Resonant Converters: A Stability\u2010Oriented Approach"],"prefix":"10.1049","volume":"2026","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-2374-9896","authenticated-orcid":false,"given":"Mahdi","family":"Vakilfard","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8266-3075","authenticated-orcid":false,"given":"Asghar","family":"Taheri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5595-5064","authenticated-orcid":false,"given":"Amir","family":"Ghasemian","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"265","published-online":{"date-parts":[[2026,1,31]]},"reference":[{"key":"e_1_2_12_1_2","doi-asserted-by":"publisher","DOI":"10.1561\/9781638280675"},{"key":"e_1_2_12_2_2","volume-title":"CPSS Power Electronics Series","author":"Sha D.","year":"2019"},{"key":"e_1_2_12_3_2","doi-asserted-by":"publisher","DOI":"10.1109\/TIE.2017.2682784"},{"key":"e_1_2_12_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.conengprac.2018.05.013"},{"key":"e_1_2_12_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.ifacol.2020.12.2253"},{"key":"e_1_2_12_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.rser.2018.04.020"},{"key":"e_1_2_12_7_2","doi-asserted-by":"publisher","DOI":"10.1049\/iet-pel.2019.0307"},{"key":"e_1_2_12_8_2","doi-asserted-by":"crossref","unstructured":"ChatterjeeD. 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