自适应高效率LED背光驱动控制电路  

A daptive high efficiency LED backlight drive control circuit

作　　者：卓启越 许新宇 周子超 邹望辉 ZHUO Qiyue;XU Xinyu;ZHOU Zichao;ZOU Wanghui(Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学,湖南长沙410114

出　　处：《微电子学与计算机》2024年第12期111-119,共9页Microelectronics & Computer

基　　金：湖南省科技创新计划(2023GK2036)。

摘　　要：针对因LED导通压降不同而产生的额外功率损耗问题,设计了一种带自适应控制的多通道LED背光驱动控制电路,通过自适应控制,最小化线性电流调节器上的电压。基于0.18μm BCD工艺搭建了一种适用于自适应控制的线性电流调节器,可实现通道电流0~48 mA线性可调,电流分辨率为0.2 mA,不同工艺角以及温度下的全电流范围误差小于0.1%,版图面积为0.504 mm^(2)。仿真结果显示,当通道电流为20 mA时,带自适应控制的三通道LED驱动电路的电源效率为95.2%,其中线性电流调节器的功率损耗降低了74%。Aiming at the problem of additional power loss caused by different LED conduction voltage drop,a multichannel LED backlight drive control circuit with adaptive control is designed.Through adaptive control,the voltage on the linear current regulator is minimized.Based on 0.18μm BCD process,a linear current regulator suitable for adaptive control is built,which can realize linear adjustment of channel current from 0 to 48 mA,and the current resolution is 0.2 mA.At different process angles and temperatures,the error of full current range is less than 0.1%,and the layout area is 0.504 mm^(2).The simulation results show that when the channel current is 20 mA,the power efficiency of the three-channel LED drive circuit with adaptive control is 95.2%,and the power loss of the linear current regulator is reduced by 74%.

关 键 词：LED驱动 自适应控制 线性电流调节 高效率 

分 类 号：TN432[电子电信—微电子学与固体电子学]