一種高精度恒流LED驅(qū)動芯片的研究與設(shè)計
發(fā)布時間：2019-06-14 05:55
【摘要】：在全球變暖、資源愈加匱乏的環(huán)境大背景下,綠色環(huán)保成為了備受矚目的熱點話題。在照明應(yīng)用的領(lǐng)域中,LED以其高效率、節(jié)能的特點掀開了人類照明歷史上的嶄新篇章。為了獲得更穩(wěn)定的LED照明,人們對LED驅(qū)動以及應(yīng)用的研究從來沒有停止過。本文設(shè)計了一款高精度恒流LED驅(qū)動芯片,主要應(yīng)用于日常的小功率照明中。區(qū)別于傳統(tǒng)的開環(huán)恒流固定關(guān)斷時間的模式,該芯片采用閉環(huán)反饋回路恒流,能夠動態(tài)調(diào)節(jié)關(guān)斷時間,具有更高的恒流精度。為了滿足低功耗的要求,芯片采用了源極驅(qū)動的方式,減小了靜態(tài)電流,不僅降低了功耗更提高了芯片的效率。對于芯片內(nèi)部的模塊設(shè)計,在完成功能的同時盡量減少器件的使用,使芯片具有小體積、低成本的特點。該芯片采用BUCK結(jié)構(gòu),輸入電壓范圍為167VAC~265VAC,滿足日常照明市電輸入的要求;芯片的輸出為10~98V;根據(jù)設(shè)計,輸出電流的峰值為90mA,平均電流為60mA,可以滿足日常照明LED的驅(qū)動要求。通過閉環(huán)恒流控制的實現(xiàn),芯片的恒流精度可以達到±3%。本論文首先簡單介紹了LED的一些特性,如發(fā)光原理和發(fā)光效率等,接著從LED驅(qū)動芯片設(shè)計的基礎(chǔ)知識著手,介紹了開關(guān)電源的常用拓撲及調(diào)制模式等內(nèi)容,然后對芯片的整體功能及閉環(huán)恒流的實現(xiàn)原理進行了描述,通過對子模塊電路的設(shè)計和仿真介紹了該芯片的內(nèi)部結(jié)構(gòu)。最后,對芯片的外圍參數(shù)進行了設(shè)計,在此基礎(chǔ)上對電路進行了相關(guān)仿真并做出了結(jié)論描述,仿真結(jié)果滿足設(shè)計要求。
[Abstract]:Under the background of global warming and increasingly scarce resources, green environmental protection has become a hot topic. In the field of lighting application, LED has opened a new chapter in the history of human lighting because of its high efficiency and energy saving. In order to obtain more stable LED lighting, the research on LED driver and application has never stopped. In this paper, a high precision constant current LED driver chip is designed, which is mainly used in daily low power lighting. Different from the traditional open-loop constant current fixed turn-off time mode, the chip adopts closed-loop feedback loop constant current, which can dynamically adjust the turn-off time and has higher constant current accuracy. In order to meet the requirements of low power consumption, the chip adopts the way of source drive, which reduces the static current, not only reduces the power consumption, but also improves the efficiency of the chip. For the internal module design of the chip, the use of the device is reduced as much as possible while the function is completed, so that the chip has the characteristics of small volume and low cost. The chip adopts BUCK structure, the input voltage range is 167 VAC 鈮，
本文編號：2499164
[Abstract]:Under the background of global warming and increasingly scarce resources, green environmental protection has become a hot topic. In the field of lighting application, LED has opened a new chapter in the history of human lighting because of its high efficiency and energy saving. In order to obtain more stable LED lighting, the research on LED driver and application has never stopped. In this paper, a high precision constant current LED driver chip is designed, which is mainly used in daily low power lighting. Different from the traditional open-loop constant current fixed turn-off time mode, the chip adopts closed-loop feedback loop constant current, which can dynamically adjust the turn-off time and has higher constant current accuracy. In order to meet the requirements of low power consumption, the chip adopts the way of source drive, which reduces the static current, not only reduces the power consumption, but also improves the efficiency of the chip. For the internal module design of the chip, the use of the device is reduced as much as possible while the function is completed, so that the chip has the characteristics of small volume and low cost. The chip adopts BUCK structure, the input voltage range is 167 VAC 鈮，
本文編號：2499164
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