Gurcam, KenanAlmali, Mehmet Nuri2025-05-102025-05-1020232079-929210.3390/electronics122449462-s2.0-85180686506https://doi.org/10.3390/electronics12244946https://hdl.handle.net/20.500.14720/15490Gurcam, Kenan/0000-0001-9051-5953Regulating LED current and voltage is critical to maintaining a constant luminous flux in AC- or DC-powered LED lighting circuits. Today, users require constant current drivers that can provide a wide range of output voltages to drive different numbers of series-connected LED arrays. This work proposes an LED driver by combining an isolated SEPIC converter operating in the continuous conduction mode (CCM) and a modified Vienna rectifier. The proposed LED driver offers a single-switch control structure by adding a Vienna rectifier to the integrated SEPIC-FLYBACK converter. This driver structure provides many advantages over traditional bridge rectifier structures. The prototype circuit was tested in an 18 W continuous current mode (CCM) to verify its feasibility. As a result of the values obtained from both simulation and prototype circuit models, it has been shown to provide many of the following advantages: 95% high efficiency, high reliability, 4% low total harmonic distortion, 97% high power factor, and 70 V low switching voltage. This work meets class C 3-2 and IEC 61000 standards.eninfo:eu-repo/semantics/openAccessLed DriverIsolated SepicVienna ConverterSwitching StressTotal Harmonic Distortion (Thd)Article1224Q2Q2WOS:001131150500001