A Single-Stage LED Driver Based on BCM Boost Circuit and LLC Converter for Street Lighting System

作者：Wang Yijie^*; Guan Yueshi; Ren Kailin; Wang Wei; Xu Dianguo

来源：IEEE Transactions on Industrial Electronics, 2015, 62(9): 5446-5457.

DOI：10.1109/TIE.2015.2416341

• Boundary conduction mode (BCM)
• LED
• LLC
• single stage

In this paper, a single-stage LED driver is proposed for a street lighting system. Two boost circuits that share a single inductor are formed by integrating the switches of a half-bridge LLC resonant converter. Both boost circuits operate in the boundary conduction mode, which realizes a power-factor correction function. Because the input voltage of the LED driver is divided by two capacitors, the bus voltage is considerably reduced to almost the input peak voltage, rendering the novel single-stage LED driver to work suitably under high-input-voltage conditions. The soft-switching characteristics of the half-bridge LLC resonant circuit are not affected by the integration of the switches; thus, the converter has a low cost and a high efficiency. A 100-W prototype was developed, and the efficiency was determined to be as high as 91.1% in a full-load state under a 220-V ac input.

• 出版日期2015-9
• 单位哈尔滨工业大学