基于LLC谐振的150WLED驱动电源设计

摘要

针对LED驱动电源的开关损耗和效率问题，设计了一种基于LLC谐振的LED驱动电源。LLC谐振变换器很好地兼顾了串、并联谐振变换器的优点，通过软开关技术有效地减小了功率器件的损耗，提高了LED驱动电源的整机效率。首先对LLC谐振变换器的电路原理进行了分析，不同频率下的阻抗特性进行了详细介绍，讨论了LLC级和PFC级各主要电路参数的设计。在此基础上制作了一台功率为150 W的样机，实验结果证明了该LED驱动电源的高效率、高功率因数性能。%To solve the problem of switching losses and efficiency issues of LED driving power,a LED driving power supply based on the LLC resonant is designed in this paper. By combining advantages of both series reso-nant converter and parallel resonant converters,LLC resonant converter reduces power losses of the device through the soft switch and effectively enhances efficiency of the LED driving power. Firstly,the circuit of LLC resonant converter and the impedance characteristics of different frequencies are analyzed in details,and then the main circuit parameters of the LLC resonant and the PFC stage are discussed. Finally,based on the analysis a 150W prototype is produced,and the experimental results prove the high efficiency and the high power factor performance of the LED driving power supply.