發明
中華民國
104111792
I 559813
適應性參考電壓追蹤控制的發光二極體驅動裝置及方法
國立臺北科技大學
2016/11/21
所提出的LED驅動器包含電流調節器、升壓型轉換器、適應性參考追蹤控制以及循序調光控制。適應性參考追蹤控制使用兩個減法器即可實現,其功能為偵測電流調節器的最小電壓變化,並產生適應性參考追蹤電壓。依據參考追蹤電壓,升壓轉換器的驅動電壓將被動態地調整,不僅維持在電流調節器的最小電壓運作,並且保持LED串的電流。當所有的LED串採用PWM調光,輸入輸出功率將有週期性地劇烈變化,進而增加驅動電壓的連波。為了緩解此問題,將採用循序PWM調光。然而,當採用循序PWM調光時,將惡化升壓型轉換器的暫態響應。因此,一個加速信號用於打開所有的LED串,以迅速對升壓型轉換器的輸出電容器放電。 An LED driver consisting of current regulators and a boost converter with adaptive reference tracking control (ARTC) and sequential dimming control is proposed. The ARTC is realized with two subtractors to detect the minimum 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 to maintain a minimum voltage on the current regulator. When all the LED strings are controlled by PWM dimming, the input–output power periodically undergoes abrupt changes, causing increased driving voltage ripple. In order to alleviate this problem, sequential PWM dimming can be applied. However, the transient response of the boost converter is deteriorated when the sequential PWM dimming is used. Hence, a speed-up signal is used to turn on all of the LED strings to quickly discharge the output capacitor of the boost converter.
本部(收文號1090026809)同意該校109年5月8日北科大產學字第1097900107號函申請終止維護專利(北科大)
專利技轉組
02-87720360
版權所有 © 國家科學及技術委員會 National Science and Technology Council All Rights Reserved.
建議使用IE 11或以上版本瀏覽器,最佳瀏覽解析度為1024x768以上|政府網站資料開放宣告
主辦單位:國家科學及技術委員會 執行單位:台灣經濟研究院 網站維護:台灣經濟研究院