【摘要】：LED作為固態(tài)光源,因其具有功耗低、壽命長以及節(jié)能環(huán)保等優(yōu)點(diǎn)而成為新一代綠色照明光源。LED取代傳統(tǒng)照明已成為當(dāng)前的趨勢。根據(jù)LED的電學(xué)特性,LED驅(qū)動電源應(yīng)當(dāng)具備高效、高可靠性以及直流驅(qū)動等特性。因此高頻開關(guān)電源已成為LED驅(qū)動技術(shù)的研究熱點(diǎn),本文將重點(diǎn)研究雙繞組LED驅(qū)動芯片模塊的設(shè)計。首先,本文研究了LED光學(xué)特性,確定了LED恒流驅(qū)動的設(shè)計要求。從電源系統(tǒng)中各個拓?fù)浣Y(jié)構(gòu)的研究出發(fā)延伸至芯片內(nèi)部模塊電路的設(shè)計,對各種拓?fù)浣Y(jié)構(gòu)進(jìn)行了分析并求得輸出電流的方程,建立理論波形,由一般演算推導(dǎo)至最終目標(biāo)方程。其次,對比分析了主流LED驅(qū)動恒流源的優(yōu)缺點(diǎn),阻容降壓型：結(jié)構(gòu)簡單、成本低廉、可靠性低；線性恒流驅(qū)動器：成本低、無頻閃,有利于驅(qū)動與燈具集成化設(shè)計；非隔離型開關(guān)電源：效率高、應(yīng)用廣泛,常用于DC-DC模塊電源的設(shè)計。最后,從用電安全方面考慮,隔離型開關(guān)電源更適用于家居照明。因此本文將重點(diǎn)研究隔離型LED驅(qū)動恒流芯片設(shè)計。針對傳統(tǒng)隔離型LED驅(qū)動電源控制復(fù)雜、成本高同時系統(tǒng)元器件數(shù)量多,可靠性低等缺點(diǎn)。論文介紹了反激原邊控制LED驅(qū)動電源,該類型電源省去傳統(tǒng)電源的副邊控制、反饋光耦,其思想主要是通過原邊輔助繞組反饋副邊退磁信號。本文重點(diǎn)研究雙繞組LED驅(qū)動電源,利用集成MOS寄生電容的充放電采集副邊退磁信號。該方案能夠進(jìn)一步簡化系統(tǒng)結(jié)構(gòu),大大提高系統(tǒng)的可靠性。基于上述思想,設(shè)計雙繞組LED驅(qū)動電源系統(tǒng)及驅(qū)動模塊。電源系統(tǒng)的技術(shù)指標(biāo)為單電壓輸入：180-264V,輸出電壓：66-99V,輸出電流：280mA。論文主要設(shè)計研究了LED驅(qū)動電源系統(tǒng)的啟動電路、隔離變壓器、采樣電阻等。此外,設(shè)計了芯片級模塊的PWM比較器、帶隙基準(zhǔn)設(shè)計、前沿消隱功能、欠壓保護(hù)、開路保護(hù)等各個重要單元,介紹了邏輯電路的控制策略,利用芯片檢測次級繞組上退磁信號進(jìn)行區(qū)域控制。采用模擬調(diào)頻調(diào)光與數(shù)字調(diào)頻調(diào)光組合的調(diào)光設(shè)計方案,通過ADJ管腳電流的變化來改變系統(tǒng)頻率從而實現(xiàn)系統(tǒng)調(diào)光功能。最后,芯片通過1um 40V工藝仿真,并搭建了應(yīng)用系統(tǒng),驗證了LED驅(qū)動芯片設(shè)計的合理性。經(jīng)測試,芯片的各項特性參數(shù)均能夠達(dá)到系統(tǒng)指標(biāo)。
[Abstract]:As a solid-state light source, LED has become a new generation of green lighting source because of its advantages of low power consumption, long life, energy saving and environmental protection. LED has become the current trend to replace traditional lighting. According to the electrical characteristics of LED, LED drive power supply should have high efficiency, high reliability and DC drive characteristics. Therefore, high frequency switching power supply has become the research hotspot of LED drive technology. This paper will focus on the design of dual-winding LED driver chip module. Firstly, the optical properties of LED are studied and the design requirements of LED constant current drive are determined. From the study of each topology in the power supply system, it extends to the design of the internal module circuit of the chip. The various topologies are analyzed, the equation of output current is obtained, and the theoretical waveform is established, which is derived from the general calculus to the final objective equation. Secondly, the advantages and disadvantages of mainstream LED drive constant current source are compared and analyzed, such as simple structure, low cost and low reliability, linear constant current driver: low cost, no stroboscopic, which is beneficial to the integrated design of drive and lamps. Non-isolated switching power supply: high efficiency, widely used, often used in the design of DC-DC module power supply. Finally, from the aspect of power safety, the isolated switch power supply is more suitable for household lighting. Therefore, this paper will focus on the design of isolated LED driver constant-current chip. The traditional isolated LED drive power supply has the disadvantages of complex control, high cost, large number of components and low reliability. This paper introduces the flyback primary control LED drive power supply. This type of power supply eliminates the secondary control of the traditional power supply and feedback optocoupler. The main idea is to feedback the secondary demagnetization signal through the primary side auxiliary winding. In this paper, the dual winding LED drive power supply is studied, and the secondary demagnetization signal is collected by the charge-discharge integrated parasitic capacitance of MOS. This scheme can further simplify the system structure and greatly improve the reliability of the system. Based on the above idea, the dual winding LED drive power supply system and driving module are designed. The technical specifications of the power supply system are single voltage input: 180-264V, output voltage: 66-99V, output current: 280mA. In this paper, the starting circuit of LED drive power system, isolation transformer, sampling resistance and so on are designed and studied. In addition, the PWM comparator, bandgap reference design, front blanking function, undervoltage protection, open circuit protection and other important units of chip level module are designed, and the control strategy of logic circuit is introduced. Using chip to detect demagnetization signal on secondary winding to carry on area control. The dimming design scheme of analog frequency modulation dimming and digital frequency modulation dimming is adopted. The system dimming function is realized by changing the frequency of the system through the change of ADJ pin current. Finally, the chip is simulated by 1um 40V process, and the application system is built, which verifies the rationality of the design of LED driver chip. The test results show that each characteristic parameter of the chip can reach the system target.
【學(xué)位授予單位】：安徽工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TM923.34

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