基于反馈控制的高能效LED驱动电路设计
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摘要
为提高可调光发光二极管(LED)的灵活性和能量效率,提出了一种基于反馈控制的LED驱动器。该驱动电路采用了自适应电压调节技术,使线性电流调节器的功率损耗降到了最低。并设计了相应的基于电阻数字模拟转换器的数字控制机制,可用于馈送dc-dc转换器的模拟反馈输入。实验结果显示,提出的数字控制方法灵活性和稳定性较高,且能够有效控制调节速度。当输入电压为26 V时,LED驱动器能够提供较宽的5 V~40 V输出电压范围,获得了较大的灵活性。在输出电流为680 mA时,稳定状态下的精确度超过97.7%,频率为1 kHz且最短的接通持续时间为4μs,系统的峰值效率达94.1%。
In order to improve the flexibility and energy efficiency of tunable light emitting diode(LED),a LED driv-er based on feedback control is proposed. The driving circuit uses the adaptive voltage regulator technology,so thatthe power loss of the linear current regulator is reduced to a minimum. The digital control system based on digital an-alog converter is designed,which can be used to feed the analog feedback input of DC-DC converter. The experimen-tal results show that the proposed method has high flexibility and stability,and can effectively control the speed ofadjustment. When the input voltage is 26 V,the LED driver is able to provide a wide range of 5 V~40 V output volt-age,and the greater flexibility is obtained. At the output current of 680 m A,the accuracy of the stable state is morethan 97.7%,the frequency is 1 kHz and the shortest time is 4 μs,the peak efficiency of the system is 94.1%.
In order to improve the flexibility and energy efficiency of tunable light emitting diode(LED),a LED driv-er based on feedback control is proposed. The driving circuit uses the adaptive voltage regulator technology,so thatthe power loss of the linear current regulator is reduced to a minimum. The digital control system based on digital an-alog converter is designed,which can be used to feed the analog feedback input of DC-DC converter. The experimen-tal results show that the proposed method has high flexibility and stability,and can effectively control the speed ofadjustment. When the input voltage is 26 V,the LED driver is able to provide a wide range of 5 V~40 V output volt-age,and the greater flexibility is obtained. At the output current of 680 m A,the accuracy of the stable state is morethan 97.7%,the frequency is 1 kHz and the shortest time is 4 μs,the peak efficiency of the system is 94.1%.
引文
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[2]Syed-Khaja A,Franke J.Design and Solder Process Optimization in MID Technology for High Power Applications[J].Advanced Materials Research,2014,1038:107-112.
[3]Chiu H J,Lo Y K,Chen J T,et al.A High-Efficiency Dimmable LED Driver for Low-Power Lighting Applications[J].IEEE Transactions on Industrial Electronics,2010,57(2):735-743.
[4]田立东,周继军,秦会斌.PWM调光LED驱动器设计[J].机电工程,2012(4):465-468.
[5]徐根达,赵合昌.一种高效大功率LED驱动电源设计[J].电源技术,2011(7):811-813.
[6]Felgner F,Exel L,Nesarajah M,et al.Component-Oriented Modeling of Thermoelectric Devices for Energy System Design[J].IEEE Transactions on Industrial Electronics,2014,61(3):1301-1310.
[7]王易,徐祥柱,黎兆宏,等.一种用于LED驱动的恒流控制电路设计[J].微电子学,2012(2):-.
[8]段华栋,苏成悦,周镇,等.基于滞环跟踪控制的LED驱动电路设计[J].现代电子技术,2012(16):134-136.
[9]Hu Y,Jovanovic M.LED Driver with Self-Adaptive Drive Voltage[J].IEEE Transactions on Power Electronics,2008,23(6):3116-3125.
[10]Garcia J,Calleja A J,LóPez Rominas E,et al.Interleaved Buck Converter for Fast PWM Dimming of High-Brightness LEDs[J].IEEE Transactions on Power Electronics,2011,26(9):2627-2636.