可調亮度與色彩之多通道 RGB LED 驅動器

Dimmable Multi-Channel RGB LED Driver

梅利安(Meriam Gay Bautista)

指導教授 ： 劉萬榮

共同指導教授 ： 林嘉洤

國立臺北大學/電機資訊學院/電機工程研究所/碩士(2013年)

摘要

本論文提出一應用於背光顯示之可調亮度與色彩之多通道RGB LED驅動器。以一線性控制直流-直流轉換器為RGB LED提供高於25mA之穩定電流。透過操作在2KHz之PWM控制，以外部輸入之電壓變化控制亮度。此LED 驅動器系統亦能經由調光電路調節個別色彩，在三個通道之中，紅、綠、藍色之驅動通道效率分別為90%、93%、93%。此架構亦提供數位輸入埠供微處理器以數位訊號控制，並使用線性電流調節器為多條路徑提供穩定偏壓電流。紅色驅動通道之溫度係數為75.43 ppm/°C，綠色與藍色驅動通道之溫度係數則皆為89.46 ppm/°C本架構以0.35micron TSMC 2P4M 5V製程技術進行設計與模擬，晶片面積為 2.31x1.48 (mm2)

關鍵字

PWM 調光,RGB,LED 驅動器,可調光,多通道

並列摘要

This paper proposes a dimmable multi-channel Red-Green-Blue (RGB) LED Driver for backlighting and display and applies variable control technique to regulate color mixing. A linear Control DC-DC converter is used to provide the needed constant current for the RGB LEDs. It is designed to provide greater than 25mA constant output current with high accuracy. A PWM control method is used, of which the variable external voltage determines the available brightness levels and has a dimming frequency of 2 kHz. The proposed LED driver system is also able to dim each individual LED color through the dimming controller circuit; for each of the 3 channel per color around 90%, 93% 93% efficiencies for the red, green and blue channels respectively. A digital port was provided for the option of Digital dimming using a microcontroller. A linear current regulator is presented and this can be extended and applied to multiple strings. The temperature coefficient for the red channel is 75.43 ppm/°C and 89.46 ppm/°C for both green and blue channel. This was designed and simulated using 0.35micron TSMC 2P4M 5V technology and the chip area is 2.31x1.48 (mm2).

並列關鍵字

PWM Dimming,RGB,LED Driver,Dimmable,Multi-Channel

參考文獻

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