Design and experimental evaluation of a single-stage AC/DC converter with PFC and hybrid full-bridge rectifier

This paper presents design and experimental evaluation of a single-stage AC/DC converter with PFC and hybrid full-bridge rectifier for supplying LED streetlight. The proposed converter consisted of one LLC resonant tank, two boost circuits and one shared inductor. By incorporating a relay switch at the secondary-side of the circuit, the output stage can be operated as two different types of rectifier: the first is as a full-bridge rectifier and the second type is as a full-bridge voltage doubler rectifier. The proposed converter was designed to receive a 240-V, 50-Hz single-phase AC supply as its input. MATLAB Simulink software was used to simulate the proposed converter, and later, a prototype was built for the experimental measurements at 100-W rated output power. The experimental results and the performance of the proposed converter were analyzed for PFC, efficiency, THD, and bus voltage. The proposed converter can achieve soft-switching characteristics since the power switches and output diodes were operated with ZVS and ZCS conditions, respectively. Furthermore, when the relay switch was closed, the output voltage was twice higher than that of when the relay switch was opened. The maximum efficiency of the proposed converter with hybrid full-bridge rectifier and full-bridge voltage doubler rectifier was about 92.6% and 93.3% respectively.