This paper presents the design and implementation of 100W wide range High Power Factor (HPF) and high efficiency, small form factor Synchronous Inverse Buck (SIB) converter for LED drivers based on a High Voltage Gallium Nitride High Electron Mobility Transistors and a novel advanced Quasi-Resonant analog controller with Power Factor Correction control. The SIB is controlled to achieve Zero Voltage Switching (ZVS) for both the power switches. A “THD Optimizer” block integrated in the analog controller allows low input current harmonic distortion, which is of paramount importance for LED drivers. The solution in this paper exploits the zero current detection and power device turn-on delay feature of a dedicated, commercially available, analog controller to add ZVS for the LS MOSFET. The ease of use of GaN SiP technology allows high efficiency and high switching frequencies in the system, while maintaining a small form factor. The paper presents the analysis and experimental results of the closed-loop system throughout the wide input and output range of operation.
