本文選題：LED驅動電源 + 功率因數(shù)校正��； 參考：《南京師范大學》2017年碩士論文

【摘要】：LED被稱為第四代綠色照明光源,憑借耗電量小、發(fā)光效率高、使用壽命長、安全可靠等優(yōu)點,已經(jīng)逐步取代傳統(tǒng)照明,在眾多領域得到廣泛應用。目前LED驅動電源存在效率低、輸出電流不穩(wěn)定等問題,縮短了 LED光源壽命,嚴重影響了 LED照明的發(fā)展。此外,為了響應現(xiàn)代照明節(jié)能環(huán)保的號召,如果能夠實現(xiàn)LED智能調光,不僅可以節(jié)能,還能延長LED的使用壽命。根據(jù)LED驅動電源設計要求,論文設計了一款具有有源功率因數(shù)校正電路(APFC)和正激電路兩級結構并且?guī)д{光功能的LED驅動電源。1.對LED的特性、原理、參數(shù),功率因數(shù)校正技術和DC/DC電路拓撲結構進行分析,根據(jù)設計需求和設計指標,確定了 LED驅動電源系統(tǒng)設計結構。2.考慮實際應用,設計了輸入保護電路、電磁干擾濾波器(EMI)和散熱裝置,提高了驅動電源的安全性和可靠性;為了提高功率因數(shù)和效率,采用ICE3PCS03G主控芯片設計了升壓式有源功率因數(shù)校正電路和采用芯片NCP1252設計了正激恒壓輸出電路;分別采用三端集成穩(wěn)壓器LM7809和LED恒流驅動專用芯片LM3404HV設計了 LED恒流驅動電路。3.在研究調光原理的基礎上,設計了基于ATmega128單片機的LED調光控制系統(tǒng),完成了 ATmega128最小系統(tǒng)、溫度采集模塊、光照采集模塊以及人體紅外監(jiān)測模塊設計。4.制作LED驅動電源,并對LED驅動電源主要性能參數(shù)進行測試,功率因數(shù)在0.95以上,效率在85%以上,功率因數(shù)和效率有較大提高。在實驗室現(xiàn)有條件下,通過ATmega128單片機進行LED照明調光測試,測試結果表明LED驅動電源穩(wěn)定工作,LED調光效果較好。
[Abstract]:LED is known as the fourth generation green lighting source. With the advantages of low power consumption, high luminous efficiency, long service life, safety and reliability, LED has gradually replaced traditional lighting and has been widely used in many fields. At present, the low efficiency and unstable output current of LED drive power supply shorten the life of LED light source and seriously affect the development of LED lighting. In addition, in order to respond to the call of modern lighting energy saving and environmental protection, if we can realize the intelligent dimming of LED, we can not only save energy, but also prolong the service life of LED. According to the design requirements of LED driving power supply, this paper designs a LED driver power supply with active power factor correction circuit (APFC) and forward circuit with the function of dimming. The characteristics, principle, parameters, power factor correction technology and DC/DC circuit topology of LED are analyzed. According to the design requirements and design specifications, the design structure of LED drive power supply system is determined. Considering the practical application, the input protection circuit, electromagnetic interference filter (EMI) and heat dissipation device are designed to improve the safety and reliability of the driving power supply, in order to improve the power factor and efficiency, The boost active power factor correction circuit and the forward constant voltage output circuit are designed by using the ICE3PCS03G main control chip and the chip NCP1252, respectively, and the LED constant current drive circuit is designed by the three-terminal integrated voltage regulator LM7809 and the LED constant current drive special chip LM3404HV. Based on the study of dimming principle, the LED dimming control system based on ATmega128 microcontroller is designed. The design of ATmega128 minimum system, temperature acquisition module, illumination acquisition module and infrared monitoring module of human body is completed. The main performance parameters of LED drive power supply are tested. The power factor is above 0.95, the efficiency is more than 85%, and the power factor and efficiency are improved greatly. Under the existing conditions of the laboratory, the LED lighting dimming test is carried out by ATmega128 single chip computer. The test results show that the LED driving power supply works stably and the dimming effect of LED is better.
【學位授予單位】：南京師范大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM923.34

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