本文選題：基準(zhǔn)電壓 + 基準(zhǔn)電流��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：污染問題越來越嚴(yán)重,全國(guó)多數(shù)城市籠罩在霧霾之下,這種背景對(duì)能源的利用效率提出新的挑戰(zhàn)。在電源技術(shù)發(fā)展的歷程中,首先出現(xiàn)的是線性穩(wěn)壓器,這種電源的致命弱點(diǎn)是效率低下,不適應(yīng)現(xiàn)代對(duì)能源高利用率的要求,因此開關(guān)電源技術(shù)被發(fā)明。開關(guān)電源技術(shù)已經(jīng)被應(yīng)用在了許多領(lǐng)域,比如消費(fèi)電子、工業(yè)控制、航天。通過閱讀大量文獻(xiàn),總結(jié)出開關(guān)電源技術(shù)未來發(fā)展的趨勢(shì)是高效率、低功耗、小型化、高頻化、高可靠性、數(shù)字化、低噪聲、高抑制EMI。開關(guān)電源技術(shù)對(duì)現(xiàn)代能源利用率的提高是顯而易見的。本文設(shè)計(jì)了一款開關(guān)電源控制芯片,該芯片的特點(diǎn)是在重載和輕載條件都較的高效率�？刂菩酒�有非常復(fù)雜的多種工作模式,結(jié)合了PWM、PFM、PSM三種調(diào)制模式,最大限度的減少功率管的損耗,包括動(dòng)態(tài)和靜態(tài)損耗,提高電源的效率。采用臺(tái)積電的模擬、數(shù)字、VDMOS混合BCD工藝,將一顆耐高壓到達(dá)700V左右的功率管集成在控制芯片里面,以此提高電路的穩(wěn)定性和降低成本。芯片還設(shè)計(jì)了多種保護(hù)電路,包括輸入欠壓、過壓、輸出過壓、溫度保護(hù)。本文的主要工作是分析基準(zhǔn)電壓源、電流源、芯片外部可編程流限模塊的溫度特性,并設(shè)計(jì)出具體電路。基準(zhǔn)電壓源、電流源為整個(gè)芯片其它模塊的提供參考電壓和參考電流,因此對(duì)基準(zhǔn)電路的設(shè)計(jì)要求特別嚴(yán)苛,要求基準(zhǔn)電壓源、電流源與工藝參數(shù)和溫度無關(guān)。因此要設(shè)計(jì)一款低溫度系數(shù)的基準(zhǔn),必須對(duì)工藝、器件的問題特性進(jìn)行分析,然后才能設(shè)計(jì)符合要求的電路。可編程流限模塊對(duì)功率管起限流作用,防止功率管電流過大發(fā)熱而被燒毀。功率管是整個(gè)芯片的主要發(fā)熱元件,溫差比較大,在設(shè)計(jì)可編程流限模塊電路尤其要考慮溫度對(duì)電路的影響,設(shè)計(jì)出對(duì)溫度不敏感的可編程流限模塊電路。本文還做了版圖設(shè)計(jì)相關(guān)的工作,具體分析了版圖布局和一些其它需要注意的問題。完成電路設(shè)計(jì)后,對(duì)相應(yīng)的電路模塊進(jìn)行了仿真,基準(zhǔn)電壓源溫度系數(shù)可達(dá)17ppm,電流源溫度系數(shù)在典型的TT工藝角下可達(dá)50ppm,可編程流限模塊功能正常,在不同溫度條件下流限值偏差在可接受范圍內(nèi)。文章最后對(duì)通過設(shè)計(jì)一個(gè)反激拓?fù)溟_關(guān)電流源電路對(duì)芯片進(jìn)行了仿真、驗(yàn)證。流片后,對(duì)芯片進(jìn)行初步測(cè)試,通過分析芯片的測(cè)試結(jié)果,芯片的功能正常,基本參數(shù)達(dá)到設(shè)計(jì)預(yù)期要求。
[Abstract]:The pollution problem is becoming more and more serious, and most cities in China are covered by haze, which poses a new challenge to the efficiency of energy use. In the course of the development of power supply technology, the first is linear voltage regulator. The fatal weakness of this kind of power supply is low efficiency, which can not meet the requirements of modern energy utilization, so switching power supply technology has been invented. Switching power technology has been used in many fields, such as consumer electronics, industrial control, aerospace. By reading a large number of literatures, it is concluded that the trend of the future development of switching power supply technology is high efficiency, low power consumption, miniaturization, high frequency, high reliability, digitalization, low noise, and high suppression of EMIs. Switching power supply technology is obvious to improve the efficiency of modern energy. In this paper, a switching power supply control chip is designed, which is characterized by high efficiency in heavy load and light load conditions. The control chip also has a lot of complex operation modes. It combines three modulation modes of PWMU PFMU PSM to minimize the loss of power transistor, including dynamic and static loss, and to improve the efficiency of power supply. By using TSMC analog and digital VDMOS hybrid BCD process, a power transistor with high voltage resistance up to 700V is integrated into the control chip to improve the stability of the circuit and reduce the cost. The chip also designed a variety of protection circuits, including input undervoltage, overvoltage, output overvoltage, temperature protection. The main work of this paper is to analyze the temperature characteristics of the reference voltage source, current source and programmable flow limit module outside the chip, and to design the specific circuit. The reference voltage source and current source provide the reference voltage and reference current for the other modules of the whole chip, so the design of the reference circuit is particularly demanding, and the reference voltage source is required. The current source is independent of the process parameters and temperature. Therefore, in order to design a low temperature coefficient reference, it is necessary to analyze the problem characteristics of the process and device before designing a circuit that meets the requirements. The programmable flow limiting module can limit the current of the power tube and prevent the power tube current from burning out. The power tube is the main heating element of the whole chip, and the temperature difference is relatively large. In designing the programmable flow limit module circuit, the influence of temperature on the circuit should be considered, and the programmable flow limit module circuit which is not sensitive to temperature is designed. The layout and some other problems needing attention are also analyzed in this paper. After the circuit design is finished, the corresponding circuit modules are simulated. The reference voltage source temperature coefficient can reach 17ppm, the current source temperature coefficient can reach 50ppm under typical TT process angle, and the programmable flow limit module has normal function. The flow limit deviation is within the acceptable range under different temperature conditions. Finally, the chip is simulated and verified by designing a flyback topology switch current source circuit. After the chip flow, the chip is preliminarily tested. By analyzing the test results of the chip, the function of the chip is normal and the basic parameters are up to the expected design requirements.
【學(xué)位授予單位】：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)】：TN86

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 張慕輝;劉詩斌;馮勇;;具有滯回功能的過溫保護(hù)電路[J];儀表技術(shù)與傳感器;2009年02期

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本文編號(hào)：1880195