电源学报2024，Vol.22Issue(4)：270-279,10.DOI:10.13234/j.issn.2095-2805.2024.4.270
高增益和多路输出均衡的高效LED驱动拓扑研究
Efficient Multi-output LED Driver Topology with High Voltage Gain
摘要
Abstract
Aimed at the current imbalance problem in parallel connected multiple light-emitting diode(LED)strings,an efficient multi-output LED driver is proposed to achieve current sharing among different LED strings and improve the efficiency of the circuit.A Boost converter and a series-resonant converter are cascaded to achieve current sharing and a high voltage gain.The transformer leakage inductance suppresses the switch's current rising rate in the turn-on period,which provides the zero-current-switch(ZCS)condition.Moreover,a lossless snubber circuit is added to slow down the switch's voltage rising rate in the turn-off period to significantly reduce the switching loss,and a large magnetizing inductance of transformer is selected to reduce the transformer loss.Meanwhile,only one active switch is used,which reduces the circuit cost and simplifies the control.Therefore,current sharing,high efficiency and high voltage gain are obtained,and the cost is low.The circuit operational principle and operating characteristics together with the specific procedure of parameter design are analyzed and presented in detail.Finally,a 7.9 W two-output prototype with 12 V input voltage was built to verify the effectiveness of the proposed LED driver.关键词
LED驱动电源/均流/软开关/电压增益Key words
Light-emitting diode(LED)driver/current sharing/soft switching/voltage gain分类
信息技术与安全科学引用本文复制引用
徐石开,曾君,刘俊峰..高增益和多路输出均衡的高效LED驱动拓扑研究[J].电源学报,2024,22(4):270-279,10.基金项目
国家自然科学基金资助项目(62173148,51877085)This work is supported by National Natural Science Foundation of China under the grant 62173148 and 51877085 （62173148,51877085）
