Planar Magnetic Regulator Applied to an LLC Converter for CCT Control

This article introduces. the concept and design of a planar magnetic regulator (PMR) integrated into a 260-W
LLC
resonant light-emitting diode driver for tunable white string. Utilizing low-profile magnetic cores and printed circuit board windings, the PMR effectively modulates the converter's magnetizing inductance. The article outlines a systematic design methodology for the PMR and its integration into the
LLC
converter to regulate the magnetizing inductance and consequently the output current. The implemented prototype exhibited zero voltage switching behavior across the entire power range and demonstrated precise control over the correlated color temperature. The PMR offers significant advantages, including enhanced power density, reduced skin effects, decreased current requirements, and a reduced need for turns in windings