一种新型无电解电容Buck-Boost正反激LED驱动电路的研究  

Study on Novel Electrolytic-capacitor-free Buck-Boost Forward-flyback LED Drive Circuit

作　　者：曾怡达[1] 朱仁伟[1] 唐丽 李宝 ZENG Yida;ZHU Renwei;TANG Li;LI Bao(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学电气工程学院,成都610031

出　　处：《电源学报》2018年第2期104-109,130,共7页Journal of Power Supply

基　　金：中央高校基本科研业务费专项基金资助项目(SW JTU2011CX003EM;SWJT2011ZT002EM)~~

摘　　要：提出了一种无电解电容Buck-Boost正反激LED驱动电路,该电路继承了传统驱动电路中将漏感能量回馈至输入端的优点。由于传统拓扑在无电解电容并增大输出功率的条件下存在输出电压纹波较大的缺点,在研究现有LED照明驱动的基础上,将正反激电路成功应用于传统驱动电路中的DC/DC级。变压器原边和副边均有电容作为中间级储能元件,变压器工作在正反激模态,提高了变压器的功率密度,同时变压器副边存在续流电感,大幅度降低了输出电压纹波率。详细分析了变换器稳态工作特性;最后,研制一台30 W的实验样机,测试结果表明了该设计的合理性和可行性。An electrolytic-capacitor-free Buck-Boost forward-flyback LED drive circuit is proposed in this paper,which inherits the advantage of the traditional drive circuit,i.e.,the energy of leakage inductance is fed back to the input terminal.Considering that the traditional topology presents large output voltage ripples at the increasing output power without electrolytic capacitor,a forward-flyback circuit is successfully applied to the traditional drive circuit of DC/DC level based on the existing research on LED lighting driver.The transformer have capacitances as the center energy storage elements on both the primary and secondary sides,and it works in forward-flyback modal,which improves its power density;meanwhile,the transformer have freewheel inductance on its secondary side,thus greatly reducing the output voltage ripples.The steady-state operating characteristics of the converter are analyzed in detail.Finally,an experimental prototype of 30 W output was manufactured,and the test results verified the reasonability and feasibility of the novel design.

关 键 词：功率因数校正 Buck-Boost正反激 单极LED驱动 无电解电容 

分 类 号：TM923[电气工程—电力电子与电力传动]