AN-9729 100WLED街道照明用半桥LLC谐振变换器的应用设计

AN-9729 LED Application Design Using Half-Bridge LLC Resonant Converter for 100W Street Lighting

本文介绍了用于大功率LED照明领域采用了半桥LLC谐振变换器的LED驱动系统，该系统对于传统PWMDC—DC变换器而言，采用非隔离型DC—DC变换器控制LED的电流和发光强度，会导致其功率转换效率降低。而半桥LLC谐振变换器不仅可以控制LED电流，而且可以大幅提升功率转换效率。另外，整个LED驱动系统的成本和体积也得到了降低及减小。

This apphcation note describes the LED driving system using a half-bridge LLC resonant converter for high power LED hghting apphcations, such as outdoor or street lighting. Due to the existence of the non-isolation DC-DC converter to control the LED current and the hght intensity, the conventional PWM DC-DC converter has the problem of low-power conversion efficiency. The half-bridge LLC converter can perform the LED current control and the efficiency can be significantly improved. Moreover, the cost and the volume of the whole LED driving system can be reduced.