| Title |
A Study on the Synchronous Rectifier Driver Circuits in the LLC Resonant Half-Bridge Converter |
| Authors |
Tae-Young Ahn ; Bum-Sun Im |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2016.30.1.079 |
| Keywords |
LLC Half Bridge Converter ; Synchronous Rectifier ; Resonant Switching ; Current Driven SR |
| Abstract |
In this paper, we propose a current-driven synchronous rectifier driver circuit for LLC resonant half-bridge converters. The proposed driver circuit detects a relatively low current in the primary side of the transformer although a large current is flowing in the secondary side. Due to this feature, the driver circuit has a simple circuit structure and stabilizes the switching operation with a logic-level switching voltages for the synchronous rectifier. The operation and performance of the proposed driver circuit are confirmed with a prototype of 1kW class LLC resonant half-bridge converter. The experimental results proved that the proposed synchronous rectifier driver method improves the power conversion efficiency by around 1% and reduces the internal power loss by 17W. |