A single-stage light-emitting diode (LED) driver has been developed integrating a single-ended primary-inductor converter with a half-bridge LLC resonant converter. The proposed topology reduces system's cost, enhancing reliability. Because the LLC resonant part maintains soft-switching characteristics, switching losses are relatively low. Due to careful parameters selection, the system bus voltage can be kept low as needed in high-power LED drive designs. Some experiments using a 100-W prototype were performed to validate theoretical analysis. The obtained power factor was as high as 0.99, and due to soft-switching operations efficiency was up to 92% at full load.
A Single-Stage LED Driver Based on SEPIC and LLC Circuits
Cecati, Carlo;
2017-01-01
Abstract
A single-stage light-emitting diode (LED) driver has been developed integrating a single-ended primary-inductor converter with a half-bridge LLC resonant converter. The proposed topology reduces system's cost, enhancing reliability. Because the LLC resonant part maintains soft-switching characteristics, switching losses are relatively low. Due to careful parameters selection, the system bus voltage can be kept low as needed in high-power LED drive designs. Some experiments using a 100-W prototype were performed to validate theoretical analysis. The obtained power factor was as high as 0.99, and due to soft-switching operations efficiency was up to 92% at full load.Pubblicazioni consigliate
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