智能化分段线性恒流LED驱动电源设计

发布时间：2018-05-29 16:22

本文选题：LED驱动 + 分段控制　；参考：《电子技术应用》2017年11期

【摘要】：传统的开关型LED驱动电源中含有大电解电容和高频变压器,导致LED驱动电源的体积庞大且使用寿命较短。分段式线性恒流驱动电源可以避免使用大电解电容和高频变压器。设计了一种新型的分段线性恒流LED驱动电源,利用整流之后的高压脉动直流电压的变化,自适应地控制LED灯珠分阶段恒流工作。除整流桥和采样电阻外,整个驱动电路可实现单芯片集成,有效缩小了体积、延长了寿命。电路中还设计了智能拓展端口,可实现智能化控制。基于华虹宏力0.5μm 700 V BCD工艺对电路进行了仿真验证,在0~311 V周期脉动高电压输入条件下,驱动芯片分四阶段恒流工作,输出最大恒定电流可达97.17 m A,在恒流阶段,电流的瞬态精度误差仅为0.031%。仿真结果表明,该LED驱动电路各指标参数均满足预期要求。
[Abstract]:The large electrolytic capacitance and high frequency transformer are included in the traditional switched LED drive power supply, which leads to the large volume and short service life of the LED drive power supply. Segmented linear constant-current drive power can avoid the use of large electrolytic capacitors and high frequency transformers. A novel piecewise linear constant-current LED drive power supply is designed, which adaptively controls the phase constant current operation of the LED lamp by using the variation of the DC voltage of the high voltage pulsation after rectifying. Besides the rectifier bridge and the sample resistance, the whole drive circuit can realize the integration of single chip, effectively reduce the volume and prolong the life. The intelligent expansion port is also designed in the circuit to realize intelligent control. Based on the Huahong Hongli 0.5 渭 m 700V BCD process, the circuit is simulated and verified. Under the input condition of 0 ~ 311V period pulsating high voltage, the drive chip is operated in four stages, and the maximum constant current output can reach 97.17 Ma, which is in the constant current stage. The transient accuracy error of current is only 0.031. The simulation results show that the parameters of the LED drive circuit meet the expected requirements.
【作者单位】：贵州大学电子科学系;半导体功率器件可靠性教育部工程研究中心;贵州振华风光半导体有限公司;
【基金】：贵州省重大科技专项(黔科合重大专项字[2015]6006) 贵州省科学技术基金(黔科合J字[2014]2067号) 贵州大学博士基金(贵大人基合字(2013)20号) 贵州省重点实验室开放基金项目(KFJJ201503)
【分类号】：TN86

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