高功率LED脈波寬度調變升壓驅動積體電路設計

Design of PWM Boost Integrated Circuit For High Power LED Driver

戴嘉泰(Jia-Tai Dai)

指導教授 ： 陳慎銚

共同指導教授 ： 郭文凱(Wen-Kai Kuo)

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2012年)

https://doi.org/10.6827/NFU.2012.00075

摘要

本論文使用TSMC (台積電) 的 0.18 μm 1P6M CMOS 製程，設計高功率白光LED燈的驅動IC。
高功率LED的導通電壓範圍在3V到3.5V，為了使數顆LED發光效率相等，因此以並聯的形式來控制給予相同的導通電壓值，並聯後的LED導通電壓大於一般電池電壓的，所以需要一個升壓電路將電池電壓轉換為高電壓提供高功率LED使用。
本論文以電流模式脈波寬度調變之升壓式轉換器電路為研究方向。經由系統的規格選擇可實現的系統架構，並以詳細而深入的理論分析探究其真相，隨之進行分析，確保系統的穩定度與可靠度，最後將理論付諸實行，設計並整合成完整的系統電路。
輸入電壓從 3V 升壓變動至3.5V，負載並接四顆 LED(2.5Ω)時，平均電感電流為1.4A，負載最大電流達到預期的1.4A以上，漣波電壓（峰對峰）小於10mV。

關鍵字

脈波寬度調變 ； 峰值電流模式 ； 連續導通模式 ； 升壓電路

並列摘要

This paper is designed with TSMC (Taiwan Semiconductor Manufacturing Company) 0.18um CMOS Mixed Signal RF General Purpose MiM Al 1P6M 1.8 & 3.3VProcess, the design of high power white LED driver IC.
High power LED’s forward voltage is almost from 3V to 3.5V, parallel connection of the LEDs provides identical LED voltages resulting in uniform brightness. Sum of the LED’s forward voltage is several times the battery voltage, so driving the LEDs need a boost converter.
This paper presents a current-mode pulse width modulation boost converter circuit. Using system specifications to chose realizable system architecture, and detailed analysis the theorem, DC mode and AC mode to ensure the stability and reliability. Finial design the sub-circuits and building a boost converter system.
When load (2.5Ω) is four parallel connection of the white LEDs and input voltage from 3V to 3.5V, average inductor current is 1.4A, load max current is flowed expected 1.4A. And output voltage ripple (peak to peak) is smaller than 10mV.

並列關鍵字

pulse width modulation (PWM)vpeak current-mode ； control continuous conduction mode(CCM) ； step-up(boost)converter

參考文獻

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