【正文】 這是一種自動設(shè)定主模塊和從模塊的方法，即在個并聯(lián)的模塊中，輸出電流最大的模塊，將自動成為主模塊，而其余的模塊則成為從模塊，它們的電壓誤差依次被整定，以校正負(fù)載電流分配的不平衡。這種方法現(xiàn)在技術(shù)比較成熟，效果比較好，是本系統(tǒng)擬采用的方法。 最大電流法自動均流法電路原理圖由于二極管D的作用，均流母線上的電壓反映的是并聯(lián)各模塊的中的最大值。由于二極管的單向性，只有對電流最大的模塊，二極管才導(dǎo)通，a點方能通過它與均流母線相連。設(shè)正常情況下，各模塊分配的電流是均衡的，如果某個模塊電流突然增大，成為n個模塊中最大的一個，于是，上升，該模塊自動成為主模塊，其它模塊為從模塊，這時=，而各從模塊的與=比較，通過調(diào)整放大器調(diào)整基準(zhǔn)電壓，自動實現(xiàn)均流。但是，由于二極管的正向壓降總是存在的，所以主模塊的均流會有誤差。為了減少主模塊的這種誤差，根據(jù)最大電流法自動均流的原理，Unitrode IC公司開發(fā)的“均流控制器集成電路”UC3907設(shè)計了一個單向緩沖器代替二極管。UC3825根據(jù)對模塊電流的監(jiān)控，由均流母線電壓確定哪個模塊的輸出電流最大，指定它為主模塊，主模塊狀態(tài)指示器工作，而其余均為從模塊，它們的電流跟隨主模塊的輸出電流，%之內(nèi)。這種均流方法，均流母線開路或短路都不會影響各電源模塊的獨立工作。第8章 結(jié)論本設(shè)計的題目是10kW直流開關(guān)電源設(shè)計，開關(guān)電源具有效率高、體積小、重量輕等顯著特點。現(xiàn)代許多工業(yè)自動化控制、通訊設(shè)備、電力設(shè)備、儀器儀表、醫(yī)療設(shè)備以及通訊設(shè)備等都離不開穩(wěn)定的直流開關(guān)電源，本文的主要內(nèi)容就是研制一種高性能、大功率直流開關(guān)電源。經(jīng)過查閱相關(guān)資料，本設(shè)計詳細(xì)分析了高性能、大功率直流開關(guān)電源的工作原理，根據(jù)任務(wù)要求確定了主電路和控制電路的詳細(xì)設(shè)計方案。主電路利用三相橋式不控整流濾波電路作為主電路的輸入及電路，移相式全橋變換器作為功率轉(zhuǎn)換單元，高頻變壓器與單相整流濾波電路作為主電路的輸出級電路。并結(jié)合設(shè)計要求設(shè)計了反饋電路、控制電路、保護(hù)電路、均流電路以及輔助電源。其中輔助電源是給控制部分供電的，因為反饋環(huán)節(jié)和控制部分是通過線性光禍合器隔離的，所以工作電源也是兩個不共地的電源，所以設(shè)計了兩個輔助電源，一個為控制電路供電，一個為反饋電路供電。在電壓調(diào)節(jié)環(huán)節(jié)采用UC3825控制芯片，并詳細(xì)的分析了基于UC3825控制芯片的PWM控制電路。通過在實驗室實驗以及Matlab軟件仿真的結(jié)果表明輸出誤差在允許范圍之內(nèi)，本文設(shè)計的10kW直流開關(guān)電源具有輸出電壓可調(diào)、輸出電流大、紋波小等特點，符合設(shè)計要求。參考文獻(xiàn)[1] ，[2] ， [3] ，[4] 楊旭，裴云慶，2004[5] ，[6] ，[7] 阮新波，[8] ，2000: 4993[9] 薛永毅，王淑英，2001[10] 張占松，1998[11] ，1999[12] ，[13] ，2002 [14] (第一版).國防工業(yè)版社，1995[15] (電源器件分冊).遼寧科學(xué)技術(shù)出版社，1999[16] ，2011(17)[17] 吳瓊，(12)[18] 胡國文，張立生，2012（4）[19] Zhu examination of conducted EMI emissions from hardand softswitching PWM inverters，2001(05)[20] Biebach J, Ehrhart P. Muller A Compact modular power supplies for superconduting inductive storage and for capacitor charging, 2001(01)致 謝本文是在冮明穎老師的悉心指導(dǎo)下完成的。論文的選題、具體工作和撰寫過程都凝聚著指導(dǎo)老師的心血和汗水。冮老師嚴(yán)謹(jǐn)、務(wù)實和認(rèn)真的工作態(tài)度給我留下了深刻的印象。在此，謹(jǐn)向冮老師表示衷心的感謝和崇高的敬意。此次設(shè)計我學(xué)到了很多知識以及很多道理。為我在今后的工作打下了一個堅實而又良好的基礎(chǔ)。在設(shè)計的過程中，我的許多朋友、同學(xué)也給予了我多方面的指導(dǎo)和幫助，他們勤奮認(rèn)真的工作態(tài)度值得我學(xué)習(xí)，在此向他們表示深切的感謝！感謝遼寧工業(yè)大學(xué)所有在學(xué)習(xí)、工作、生活以及思想上所有幫助和教導(dǎo)我的老師，他們嚴(yán)謹(jǐn)求實的治學(xué)態(tài)度，豐富淵博的知識涵養(yǎng)，嚴(yán)肅認(rèn)真的工作作風(fēng)和兢兢業(yè)業(yè)的敬業(yè)精神，使我終生受益。感謝所有幫助過我的老師、朋友、同學(xué)們，正是由于你們的幫助和支持，我才能克服一個一個的困難和疑惑，直至本設(shè)計的順利完成！最后，向各位參加答辯的老師、答辯評委們致以最誠摯的謝意!附 錄1附圖1 主電路圖 附 錄2DC Switching Power Supply Protection TechnologyAbstract: The DC switching power supply protection system, protection system design principles and machine protection measures, an analysis of switching power supply in the range of protected characteristics and its design methodology,introduced a number of practical protection circuit. Keywords: switching power supply protection circuit system designIntroduction DC switching regulator used in the price of more expensive highpower switching devices, the control circuit is also more plex, In addition, the load switching regulators are generally used a large number of highly integrated electronic systems installed devices. Transistors and integrated device tolerance electricity, less heat shocks. Switching Regulators therefore should take into account the protection of voltage regulators and load their own safety. Many different types of circuit protection, polarity protection, introduced here, the program protection, overcurrent protection, overvoltage protection, undervoltage protection and overtemperature protection circuit. Usually chosen to be some bination of protection, constitutes a plete protection system.polarity protection DC switching regulator input are generally not regulated DC power supply. Operating errors or accidents as a result of the situation will take its wrong polarity, switching power supply will be damaged. Polarity protection purposes, is to make the switching regulator only when the correct polarity is not connected to DC power supply regulator to work at. Connecting a single device can achieve power polarity protection. Since the diode D to flow through switching regulator input total current, this circuit applied in a lowpower switching regulator more suitable. Power in the larger occasion, while the polarity protection circuit as a procedure to protect a link, save the power required for polarity protection diodes, power consumption will be reduced. In order to easy to operate, make it easier to identify the correct polarity or not, collect the next light.procedures to protect Switching power supply circuit is rather plicated, basically can be divided into lowpower and highpower part of the control part of the switch. Switch is a highpower transistors, for the protection of the transistor switch is turned on or off power safety, we must first modulator, amplifier and other lowpower control circuit. To this end, the boot to ensure the correct procedures. Switching Regulators generally take the input of a small inductor, the input filter capacitor. Moment in the boot, filter capacitor will flow a lot of surge current, the surge current can be several times more than the normal input current. Such a large surge current may contact the general power switch or relay contact melting, and the input fuse fuse. In addition, the capacitor surge current will damage to shorten the life span of premature damage. To this end, the boot should be access to a current limiting resistor, through the current limiting resistor to capacitor charging. In order not to make the current limiting resistor excessive power consumption, thus affecting the normal switching regulator, and the transient process in the boot after a short period then automatically relays it to DC power supply directly to the switching regulator power supply. This circuit switching regulator called a soft start circuit.Switching regulator control circuit of the logic ponents required or opamp auxiliary power supply. To this end, the auxiliary power supply must be in the switch circuit. This control circuit can be used to ensure the boot. Normal boot process is: to identify the polarity of input power, voltage protection procedures → boot → auxiliary power supply circuit and through current limiting resistor R of the switchin