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首页> 外文期刊>Circuits and Systems I: Regular Papers, IEEE Transactions on >SAR-Controlled Adaptive Off-Time Technique Without Sensing Resistor for Achieving High Efficiency and Accuracy LED Lighting System
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SAR-Controlled Adaptive Off-Time Technique Without Sensing Resistor for Achieving High Efficiency and Accuracy LED Lighting System

机译：SAR控制的无需感应电阻的自适应关断技术，可实现高效，高精度的LED照明系统

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摘要

A successive approximation register (SAR) is utilized to control adaptive off-time in order to regulate accurate light-emitting diode (LED) current and improve efficiency of LED driver. The proposed SAR-controlled adaptive off-time technique without the external sensing resistor can sense the current flowing through LEDs during the turning on of the N-type power MOSFET, as well as provide adaptive off-time depending on the input voltage and the numbers of LED, to obtain an accurate LED current. Experimental results show the inductor current ripple is kept within ${pm 15}%$ of the DC current. As a result, line regulation is guaranteed in this proposed design.
机译：利用逐次逼近寄存器（SAR）来控制自适应关断时间，以调节准确的发光二极管（LED）电流并提高LED驱动器的效率。拟议的SAR控制的自适应关断时间技术，无需外部感测电阻，可以在N型功率MOSFET导通期间感测流经LED的电流，并根据输入电压和数量提供自适应关断时间LED，以获得准确的LED电流。实验结果表明，电感器电流纹波保持在直流电流的{{pm 15}％$）之内。结果，在该提出的设计中保证了线路调节。

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