基于两路Cuk改进电路的恒流源  

Constant Current Drive Power Supplies Based on Two Cuk Improved Circuits

作　　者：晏玉林 夏焰坤 刘力友 YAN Yulin;XIAYankun;LIU Liyou(School of Electrical Engineering and Electronic Information,Xihua University,Chengdu 610039,Sichuan,China)

机构地区：[1]西华大学电气与电子信息学院,四川成都610039

出　　处：《电气传动》2023年第10期44-48,共5页Electric Drive

摘　　要：使用恒流源来驱动LED可得到两路相等的输出电流。提出了基于两路Cuk改进电路的恒流源,分析了其电路结构、工作模态和恒流原理,同时推导了其电压、电流和功率表达式。最后搭建的功率为3 W的样机证明了其恒流理论。结果表明:该恒流源利用Cuk变换电路结构中的中间储能电容元件实现对两路LED输出支路的自动恒流,控制其中一路负载电流实现两路恒流;利用Cuk变换电路的升降压得到各路LED负载所需的电压。In order to achieve equal current,a constant current source should be used to drive the LEDs.A constant current source based on two output Cuk improved circuits was proposed.The circuit structure,working mode and constant current principle were analyzed,and the voltage,current and power expressions were derived.Finally,a prototype with an output power of 3 W was built to prove its constant current theory.The results demonstrate that the constant current source uses the intermediate energy storage capacitor element in the Cuk conversion circuit structure to realize the automatic constant current of the two LED output branches,which controls one of the load currents to automatically achieve two constant currents.The buck-boost voltage of the Cuk conversion circuit is used to obtain the voltage required for each LED load.

关 键 词：Cuk电路 LED驱动 多路恒流源 

分 类 号：TM46[电气工程—电器]