基于PSR控制的單級PFC高精度LED驅(qū)動的研究與設(shè)計(jì)
發(fā)布時間：2019-07-02 19:47
【摘要】：近年來隨著全球能源成本的持續(xù)上升,世界上大多數(shù)國家和社會對節(jié)能環(huán)保的要求越來越高,更高效、更低成本的照明光源相繼被研發(fā)出來,其中以LED為代表的新一代照明光源以其效率高、壽命長、成本低、綠色環(huán)保等眾多優(yōu)點(diǎn)[1]而被世界上眾多的國家、科研機(jī)構(gòu)和照明企業(yè)所廣泛重視。這些都使得LED照明在世界照明市場上的比重越來越大,從而帶動了LED驅(qū)動產(chǎn)業(yè)的迅速發(fā)展。然而普通的LED驅(qū)動電源因?yàn)闆]有功率因數(shù)校正功能而造成了諧波污染等各種問題,影響了電網(wǎng)的安全。因此帶有功率因數(shù)校正功能的LED驅(qū)動電源應(yīng)運(yùn)而生,有效抑制了諧波對電網(wǎng)的污染,極大提升了電能的使用效率�；谛」β蔐ED照明的場合,本文設(shè)計(jì)了一款帶有功率因數(shù)校正功能的反激式LED驅(qū)動芯片。反激式的拓?fù)涫沟秒娐方Y(jié)構(gòu)更加簡單,不需要次級輸出電感,因而成本更低。使用原邊反饋(PSR)的方式控制環(huán)路及輸出電流,雖然在電流控制上不如次級反饋更精確,但省去了光耦,降低了體積和成本,提高了系統(tǒng)穩(wěn)定性。該芯片工作于斷續(xù)工作模式,具有過溫保護(hù)、過壓保護(hù)以及負(fù)載短路開路保護(hù)等功能,同時還能夠?qū)π酒M(jìn)行欠壓保護(hù),防止因輸入電壓突然低于設(shè)定值而導(dǎo)致電流過大,器件損壞等情況出現(xiàn)。芯片內(nèi)部主要模塊包括啟動與欠壓保護(hù)模塊、電壓基準(zhǔn)模塊、誤差放大器模塊、波谷檢測模塊、數(shù)字邏輯模塊、驅(qū)動模塊等。文中闡述了單級反激式PFC芯片的電流及PF值控制理論,并推導(dǎo)了基于原邊反饋的電流控制方程式。根據(jù)芯片設(shè)計(jì)要求,完成了芯片電路總體布局構(gòu)思,并且完成了基于TSMC 0.5?m數(shù)�；旌闲盘朆CD工藝仿真模型的芯片內(nèi)部所有模塊的設(shè)計(jì)與仿真,在輸入電壓90~265V AC/50Hz的范圍內(nèi),完成了芯片的整體仿真與驗(yàn)證。仿真結(jié)果達(dá)到了輸出電流300毫安,恒流精度高于5%,功率因數(shù)校正值大于0.9的設(shè)計(jì)要求和目標(biāo)。
[Abstract]:In recent years, with the continuous rise of global energy cost, most countries and societies in the world have higher and higher requirements for energy saving and environmental protection, more efficient and lower cost lighting sources have been developed one after another. Among them, the new generation of lighting light sources represented by LED has been widely valued by many countries, scientific research institutions and lighting enterprises because of its many advantages, such as high efficiency, long life, low cost, green environmental protection and so on. All these make the proportion of LED lighting in the world lighting market more and more, which leads to the rapid development of LED-driven industry. However, the common LED drive power supply has caused various problems such as harmonic pollution because of the lack of power factor correction function, which affects the safety of the power grid. Therefore, the LED driving power supply with power factor correction function emerges as the times require, which effectively suppresses the harmonic pollution to the power grid and greatly improves the efficiency of electric energy. Based on the situation of low power LED lighting, a flyback LED driver chip with power factor correction function is designed in this paper. The flyback topology makes the circuit structure simpler and does not need secondary output inductance, so the cost is lower. The original edge feedback (PSR) is used to control the loop and output current, although the current control is not as accurate as the secondary feedback, but the photocoupling is eliminated, the volume and cost are reduced, and the stability of the system is improved. The chip works in intermittent working mode and has the functions of overtemperature protection, overvoltage protection and load short circuit open circuit protection. At the same time, it can also protect the chip against excessive current and device damage caused by the sudden lower input voltage than the set value. The main modules of the chip include start-up and undervoltage protection module, voltage reference module, error amplifier module, wave valley detection module, digital logic module, drive module and so on. In this paper, the current and FP value control theory of single-stage flyback PFC chip is described, and the current control equation based on original edge feedback is derived. According to the requirements of chip design, the overall layout of the chip circuit is completed, and all the modules inside the chip based on TSMC 0.5 / m digital-analog mixed signal BCD process simulation model are designed and simulated. The overall simulation and verification of the chip are completed in the range of input voltage 90 脳 265V AC/50Hz. The simulation results meet the design requirements and objectives of output current of 300 Ma, constant current accuracy of more than 5% and power factor correction value of more than 0.9.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM923.34
本文編號：2509178
[Abstract]:In recent years, with the continuous rise of global energy cost, most countries and societies in the world have higher and higher requirements for energy saving and environmental protection, more efficient and lower cost lighting sources have been developed one after another. Among them, the new generation of lighting light sources represented by LED has been widely valued by many countries, scientific research institutions and lighting enterprises because of its many advantages, such as high efficiency, long life, low cost, green environmental protection and so on. All these make the proportion of LED lighting in the world lighting market more and more, which leads to the rapid development of LED-driven industry. However, the common LED drive power supply has caused various problems such as harmonic pollution because of the lack of power factor correction function, which affects the safety of the power grid. Therefore, the LED driving power supply with power factor correction function emerges as the times require, which effectively suppresses the harmonic pollution to the power grid and greatly improves the efficiency of electric energy. Based on the situation of low power LED lighting, a flyback LED driver chip with power factor correction function is designed in this paper. The flyback topology makes the circuit structure simpler and does not need secondary output inductance, so the cost is lower. The original edge feedback (PSR) is used to control the loop and output current, although the current control is not as accurate as the secondary feedback, but the photocoupling is eliminated, the volume and cost are reduced, and the stability of the system is improved. The chip works in intermittent working mode and has the functions of overtemperature protection, overvoltage protection and load short circuit open circuit protection. At the same time, it can also protect the chip against excessive current and device damage caused by the sudden lower input voltage than the set value. The main modules of the chip include start-up and undervoltage protection module, voltage reference module, error amplifier module, wave valley detection module, digital logic module, drive module and so on. In this paper, the current and FP value control theory of single-stage flyback PFC chip is described, and the current control equation based on original edge feedback is derived. According to the requirements of chip design, the overall layout of the chip circuit is completed, and all the modules inside the chip based on TSMC 0.5 / m digital-analog mixed signal BCD process simulation model are designed and simulated. The overall simulation and verification of the chip are completed in the range of input voltage 90 脳 265V AC/50Hz. The simulation results meet the design requirements and objectives of output current of 300 Ma, constant current accuracy of more than 5% and power factor correction value of more than 0.9.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM923.34
【參考文獻(xiàn)】
相關(guān)碩士學(xué)位論文 前1條
1 鄭艷麗;LED驅(qū)動電源測試與認(rèn)證中的技術(shù)問題研究[D];杭州電子科技大學(xué);2011年
，本文編號：2509178
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