本文選題：LED驅動 + Buck　； 參考：《西安電子科技大學》2014年碩士論文

【摘要】：隨著節(jié)能減排、綠色經濟和循環(huán)經濟的發(fā)展深入,我國將逐步禁止白熾燈的使用。LED能耗非常低節(jié)能效果明顯,其能耗只是傳統(tǒng)白熾燈光照源的10%左右,是節(jié)能燈的25%左右。LED不僅節(jié)能效果明顯,而且具有更寬的光機色域、更高色彩飽和度,應用范圍更廣。LED的平均使用壽命長達60000小時以上,其壽命遠遠長于傳統(tǒng)的照明源。LED具有節(jié)能效果好、應用范圍廣和使用壽命長等優(yōu)點成為下一代照明主要照明源是大勢所趨。為了使LED在工作過程中能穩(wěn)定和照明亮度保持不變,因此需專門的驅動芯片來控制保證流過LED的電流恒定。本論文主要是針對小功率LED燈設計一款低成本高恒流精度的驅動芯片。本產品是應用于Buck型LED驅動系統(tǒng),支持全電壓輸入(交流85V-265V),可大大降低系統(tǒng)成本。芯片采用PSM控制并且可以根據(jù)負載的輕載重載情況調整輸出占空比,在保證高的輸出效率的同時又降低了輸出紋波。系統(tǒng)在滿載情況下輸出效率可以達到90%以上,且輸出的恒流精度在±1%的誤差范圍內。本論文首先對的LED的現(xiàn)狀、基本特性和應用做了簡單介紹。然后介紹了LED的主要的驅動方式、驅動框架、拓撲結構和主要的控制方式,并針對本系統(tǒng)的應用詳細的分析了在不同工作模式下的工作情況。其次對于本系統(tǒng)的工作原理和系統(tǒng)的結構功能做了詳細的分析。此外介紹了芯片內部各個主要模塊的基本功能,并根據(jù)模塊功能設計了電路,并在CSMC的0.8um 40V BCD工藝設計下對于電路進行了仿真和對于仿真結果做了分析。最后針對系統(tǒng)進行了系統(tǒng)級的仿真,并結合仿真結果來評估了芯片和系統(tǒng)的性能,芯片的各項指標均符合設計要求。
[Abstract]:With the development of energy saving and emission reduction, green economy and circular economy, our country will gradually ban the use of incandescent lamps. The energy consumption of LED is very low, and the energy consumption is only about 10% of the traditional incandescent light source. About 25% of the energy-saving lamps. Led not only energy saving effect, but also with a wider light machine color gamut, higher color saturation, a wider range of applications. Led average service life of more than 60000 hours, Its life is far longer than the traditional lighting source. Led has good energy saving effect, wide application range and long service life to become the main lighting source for the next generation of lighting is the general trend. In order to keep the LED stable and illumination brightness constant during the working process, a special drive chip is needed to control the current that flows through the LED. In this paper, a low cost and high constant-current drive chip is designed for low power LED lamp. This product is used in Buck LED drive system, supporting full voltage input (AC 85V-265 V), can greatly reduce the cost of the system. The chip adopts PSM control and can adjust the output duty cycle according to the light load and heavy load, which can ensure high output efficiency and reduce the output ripple at the same time. The output efficiency of the system can reach more than 90% under the condition of full load, and the output accuracy of constant current is within 鹵1% error range. This paper first introduces the current situation, basic characteristics and application of LED. Then the main driving mode, driving frame, topology structure and main control mode of LED are introduced, and the working conditions under different working modes are analyzed in detail for the application of this system. Secondly, the working principle of the system and the structure and function of the system are analyzed in detail. In addition, the basic functions of each main module in the chip are introduced, and the circuit is designed according to the module function. The circuit is simulated under the 0.8um 40V BCD process design and the simulation results are analyzed. Finally, the system-level simulation is carried out for the system, and the performance of the chip and the system is evaluated based on the simulation results. All the specifications of the chip are in line with the design requirements.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM923.34

【參考文獻】

相關碩士學位論文 前1條

1 楊向一;一款采用PSM調制模式的AC-DC芯片的設計[D];西安電子科技大學;2012年

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本文編號：1992785