共查询到18条相似文献,搜索用时 78 毫秒
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近年,电视机显示屏已经逐步从CCFL时代过渡到LED时代。显示屏日益大型化,LED背光驱动技术也是不断发展。传统升压型LED驱动传统的LED驱动采用升压型Boost电路,简化电路形式如图1所示。 相似文献
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大功率LED灯有很多优点,而LED驱动电路对LED非常重要,LED驱动和调光是目前研究的热点。针对目前LED驱动电路的不足,设计了一种新颖的LED驱动电路,该电路以单端反激式开关电源为控制的第一级,压控制恒流源为第二级,可同时保证控制精度和效率。实验结果表明该电路效率高、功率大,同时电路还能自适应调光,更加节能可靠。 相似文献
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介绍了高亮度LED的特点和优势,以及LED驱动电路在LED照明系统中的重要性,阐述了LED驱动芯片的要求和功能模块的构成,分析了驱动芯片中几种典型电路,讨论了3种主要系列LED驱动芯片的优缺点以及高亮度LED驱动的发展趋势。 相似文献
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大功率太阳能LED路灯恒流驱动电源设计 总被引:1,自引:0,他引:1
《现代电子技术》2017,(6):168-170
针对大功率恒流电源驱动技术在太阳能LED照明路灯中的应用,介绍了大功率LED恒流驱动电源设计方法。并给出Boost开关电源工作原理及其驱动电源元件参数的计算方法。对设计的电源进行效率测试,当升压比为1.4时,转换效率为92%。测试结果表明,该LED路灯恒流驱动电源具有较高的转换效率,有一定的实用价值。 相似文献
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本文介绍一种LED照明驱动电路失效机理的原理和方法。LED灯具失效分为源于电源驱动电路的失效和来源于LED器件本身的失效。在本文研究中,分析了典型LED电源驱动电路原理,并通过从在加入浪涌电压下的仿真实验,测得的LED驱动电路的各项参数指标进行失效分析,从而预测出各种实际工作中的敏感参数对失效的影响。最终,从理论的角度上给出LED器件本身失效的解决方案。 相似文献
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《Microelectronics Journal》2015,46(6):513-518
An LED driver consisting of dimmable current regulators and a boost converter with adaptive reference tracking control (ARTC) is proposed. The ARTC is realized with only one integrator and one subtractor to detect the voltage variation among the current regulators and then to generate an adaptive reference tracking voltage. Based on the reference tracking voltage, the driving voltage of the boost converter is dynamically adjusted, so as to not only maintain a minimum voltage on the current regulator but also keep the required LED-string current. A prototype control circuit including ARTC and PWM control fabricated with TSMC 0.35-μm 2P4M CMOS process validates the proposed technique. The measurement results show that the driving voltage of the boost converter is automatically regulated to compensate for the voltage alteration on the current regulators. Furthermore, the overall efficiency of the LED driver with ARTC is 6.1% better than that of the LED driver without ARTC. 相似文献
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This paper presents a high dimming ratio light emitting diode (LED) drive controller chip with digital mode dimming (DMD). The chip is composed of a boost power converter and a dimming control block. A novel constant on time (COT) control strategy is proposed for boost converter to achieve high dimming ratio. In addition, a fast enough load transient response of the converter power stage ensures its high dimming ratio. The COT control circuit operates mainly based on two current-capacitor timers and a finite state machine (FSM). The LED drive controller chip is designed and fabricated in 1.5μm bipolar CMOS-DMOS (BCD) process with a die area of 1.31 x 1.43 mm^2. Experimental results show that the proposed LED drive system works well. And, as expected, the minimum LED dimming on time of 1.0μs and the corresponding dimming ratio of 1000 : 1 at 1 kHz dimming frequency are successfully achieved. 相似文献
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This paper presents a high dimming ratio light emitting diode (LED) drive controller chip with digital mode dimming (DMD). The chip is composed of a boost power converter and a dimming control block. A novel constant on time (COT) control strategy is proposed for boost converter to achieve high dimming ratio. In addition, a fast enough load transient response of the converter power stage ensures its high dimming ratio. The COT control circuit operates mainly based on two current-capacitor timers and a finite state machine (FSM). The LED drive con-troller chip is designed and fabricated in 1.5μm bipolar CMOS-DMOS (BCD) process with a die area of 1.31 × 1.43 mm2. Experimental results show that the proposed LED drive system works well. And, as expected, the minimum LED dimming on time of 1.0μs and the corresponding dimming ratio of 1000 : 1 at 1 kHz dimming frequency are successfully achieved. 相似文献
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以WXCAT43-TG3#001 transmissive型a-SiTFT-LCD液晶显示为模块,重点研究了基于ARM9T的S3C2440A处理器控制TFT触摸屏式液晶显示器的整体设计。文中主要研究了WXCAT43-TG3#001的LCD相关参数如何设置,并进行了详细分析。根据该液晶显示屏的特点设计了与S3C2440连接的显示电路,该电路利用MX629组成的DC-DC升压电路提供液晶屏背光LED驱动,其目的是可以利用S3C2440A的GPF4脚控制背光LED,使其在设备休眠状态,及时关闭LCD,达到节能的目的。然后对触摸屏的原理进行了阐述,特别对其工作原理进行了详细研究,并对其参数进行了相应设置。 相似文献
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文章以WXCAT43-TG3 # 001 transmissive型a-SiTFT-LCD液晶显示为模块,重点研究了基于ARM9T的S3C2440A处理器控制TFT触摸屏式液晶显示器的整体设计。文中主要研究了WXCAT43-TG3 # 001的LCD相关参数如何设置,进行了详细的分析。并根据该液晶显示屏的特点设计了与S3C2440连接的显示电路,该电路利用MX629组成的DC-DC升压电路提供液晶屏背光LED驱动,其目的是可以利用S3C2440A的GPF4脚控制背光LED,使其在设备休眠状态,及时关闭LCD,达到节能的目的。文章还对触摸屏的原理进行了阐述,特别对触摸屏的工作原理进行了详细研究并对其参数进行了相应设置。 相似文献
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