High-gain single-switch single-input dual-output DC-DC converter with reduced switching stress

摘要

In light-emitting diode (LED) driver applications, as an alternative of employing two separate conventional DC-DC converters, single-input dual-output converters (SIDO) have excellent performance over traditional topologies. However, SIDO has the limitation of more number switches required, which leads to higher switching losses and deteriorating efficiency. In order to overcome this drawback, this paper presents a novel of a single-switch single-input dual-output DC-DC converter with a high-gain ratio. It attains the two boosted outputs with a high-gain conversion ratio using a single switch by incorporating the switched-capacitor technique. In addition, the bulkiness of the converter was reduced by utilizing only one inductor and switch. Moreover, it improves efficiency by reduced switching stress and cross-regulation at output ends. Furthermore, the performance of the converter in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) has been explained in this paper. Finally, a 120-W hardware setup has been built and tested. The experiment results are presented to validate the merits of the proposed topology.