本文選題：LED驅(qū)動(dòng) + Buck��； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：隨著節(jié)能減排、綠色經(jīng)濟(jì)和循環(huán)經(jīng)濟(jì)的發(fā)展深入,我國(guó)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(jī)色域、更高色彩飽和度,應(yīng)用范圍更廣。LED的平均使用壽命長(zhǎng)達(dá)60000小時(shí)以上,其壽命遠(yuǎn)遠(yuǎn)長(zhǎng)于傳統(tǒng)的照明源。LED具有節(jié)能效果好、應(yīng)用范圍廣和使用壽命長(zhǎng)等優(yōu)點(diǎn)成為下一代照明主要照明源是大勢(shì)所趨。為了使LED在工作過(guò)程中能穩(wěn)定和照明亮度保持不變,因此需專門的驅(qū)動(dòng)芯片來(lái)控制保證流過(guò)LED的電流恒定。本論文主要是針對(duì)小功率LED燈設(shè)計(jì)一款低成本高恒流精度的驅(qū)動(dòng)芯片。本產(chǎn)品是應(yīng)用于Buck型LED驅(qū)動(dòng)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(fù)載的輕載重載情況調(diào)整輸出占空比,在保證高的輸出效率的同時(shí)又降低了輸出紋波。系統(tǒng)在滿載情況下輸出效率可以達(dá)到90%以上,且輸出的恒流精度在±1%的誤差范圍內(nèi)。本論文首先對(duì)的LED的現(xiàn)狀、基本特性和應(yīng)用做了簡(jiǎn)單介紹。然后介紹了LED的主要的驅(qū)動(dòng)方式、驅(qū)動(dòng)框架、拓?fù)浣Y(jié)構(gòu)和主要的控制方式,并針對(duì)本系統(tǒng)的應(yīng)用詳細(xì)的分析了在不同工作模式下的工作情況。其次對(duì)于本系統(tǒng)的工作原理和系統(tǒng)的結(jié)構(gòu)功能做了詳細(xì)的分析。此外介紹了芯片內(nèi)部各個(gè)主要模塊的基本功能,并根據(jù)模塊功能設(shè)計(jì)了電路,并在CSMC的0.8um 40V BCD工藝設(shè)計(jì)下對(duì)于電路進(jìn)行了仿真和對(duì)于仿真結(jié)果做了分析。最后針對(duì)系統(tǒng)進(jìn)行了系統(tǒng)級(jí)的仿真,并結(jié)合仿真結(jié)果來(lái)評(píng)估了芯片和系統(tǒng)的性能,芯片的各項(xiàng)指標(biāo)均符合設(shè)計(jì)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(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM923.34

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 楊向一;一款采用PSM調(diào)制模式的AC-DC芯片的設(shè)計(jì)[D];西安電子科技大學(xué);2012年

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本文編號(hào)：1992785