一种新型单级无桥Boost-Buck电路设计分析  

Design and Analysis of a Single-Stage Bridgeless Boost-Buck Converter

作　　者：郑清良[1] 张强[1] 林维明[1] 

机构地区：[1]福州大学电气工程与自动化学院,福州350116

出　　处：《电气技术》2015年第3期15-17,39,共4页Electrical Engineering

基　　金：福建省高校产学合作科技重大项目资助(2014H6012);福州大学科研启动基金资助(510069)

摘　　要：大功率LED驱动器一般采用两级电路,两级电路器件多,并且需要两套控制,增加了成本;同时在输入低压大电流下驱动器的效率受到整流桥导通损耗的限制.本文提出了一种单级无桥Boost-Buck PFC电路,前级PFC级采用无桥Boost结构以提高效率;后级DC/DC级采用Buck电路实现降压功能,同时集成两级电路为一级.采用DCM＋CCM控制策略,实验设计了一台交流输入AC85～135Vrms,输出2A/150W的样机与两级Boost＋Buck电路进行对比,实验结果表明所提电路与控制策略在输入低压大电流下效率达90％以上,PF在0.985以上,THD在17％以下,满足IEC1000-3-2 C类谐波限制标准要求,具有比两级电路更优的电气性能.Two-stage circuit is widely used in the high-power LED driver supply. However, the cost increases for requiring more components and two sets of control, and the full-bridge diode rectifier also reduces the converter efficiency due to the large conduction losses. This paper presents a novel single-stage （SS） bridgeless Boost-Buck circuit. Boost circuit serves as a PFC stage and Buck as a DC/DC stage. Bridgeless structure can reduce conduction losses effectively, the proposed DCM＋CCM control strategy is used to simplify the control. At last, a prototype with 85-135Vrms input and 2A/150W output was set up to verify the theoretical analysis. The power efficiency≥90%, high power factor≥0.985 and THD（ 17% were achieved at rated output power. The experimental results show that the proposed topology has better performance than two-stage Boost＋Buck in low-input voltage ＆ high-input current occasion.

关 键 词：LED驱动器 功率因数校正(PFC) 效率 

分 类 号：TM46[电气工程—电器]