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1、研究生课程考试答题册研究生课程考试答题册姓 名 唐国林唐国林学 号 2014261587考试课程 电电源源变换变换技技术术课程编号 09G116考试日期 2015 年 1 月 9 日西北工业大学研究生院西北工业大学研究生院得得 分：分：1低压大电流反激式同步整流开关电源的研究与设计摘摘 要要近年来，随着电子技术的快速发展，使得低电压、大电流电路为未来主要发展趋势。 低电压、大电流工作有利于提高工作电路的整体功率，但同时也给电路设计带来了新的问 题。传统的变换器中常采用普通二极管或肖特基二极管整流方式，在低压、大电流输出的 电路中，应用传统二极管整流的电路，其整流的损耗比较大，工作效率比较低。一
2、般普通 二极管的压降为1.01.3V,即便应用压降较低的肖特基二极管(SBD)，产生压降一般也要有 0.5V左右，从而使整流的损耗增加，电源的工作效率降低，已经不能满足现代开关电源高 性能的需求。因此，应用同步整流(SR)技术可达到此要求，即应用功率MOS管代替传统的二 极管整流。由于功率MOS管具有导通电阻很低、开关时间较短、输入阻抗很高的特点，很大 程度的减少了开关功率MOS管整流时的损耗，使得工作效率有一个显著提高，因此功率MOS 管以成为低压大电流功率变换器首选的整流器件。要想得到经济、高效的变换器，同步整 流技术与反激变换器电路结合将会是一个很好的选择。反激变换器拓扑电路的优点是电路
3、 结构简单、输入与输出电气隔离、输入、输出工作电压范围较宽，可以实现多路的输出， 因而在高电压、低电流的场合应用广泛，特别是在5200W电源中一般采用反激变换器。 本文介绍了采用同步整流技术的低压、大电流输出的反激式变换器的设计，比较了在 不同模式下反激变换器的工作方式，对反激式电路、同步整流电路进行了研究与分析，并 且分别介绍了采用同步整流技术的开关电源各部分的工作原理。本文对反激式同步整流电 路进行了理论上的分析，并设计了一块85265V电压输入，3V/10A输出的反激式开关电源。 应用VIPer53电源集成芯片，副边采用功率MOSFET进行整流，通过结果可以看出，在低电压、 大电流输出的
4、电路中，应用同步整流技术可以显著地提高开关电源的工作效率，在低压、 大电流开关电源中具有明显的市场实用。关键词：同步整流；反激变换器；软开关；MOSFET; VIPer532AbstractResent few years, has witnessed that the development of electronic technology, make the working voltage of the circuit is more and more low, current is bigger and bigger. Low voltage work is helpful to red
5、uce the overall power consumption of the circuit, but it puts forward a new problem to the power supply design. The traditional converter often adopts the ordinary diodes or Scotty diode rectifier, in the case of low voltage, high current output, rectifier diode conduction voltage drop is higher，esp
6、ecially the wastage of the output rectifier. Fast recovery diodes (FRD) or super fest recovery diode (SRD) of the pressure drop can be up to 1.01.2V，even with low pressure drop of the Scotty barrier diode (SBD)，also produces about 0.5 V voltage, lead to rectifying loss increases, power efficiency de
7、cline, has been unable to meet the low voltage high current switching power supply the need of high efficiency and small volume. In this case, its necessary to adopt synchronous rectifier (SR) technology，which uses the power MOSFET instead of the traditional or conventional diode for rectifier Scott
8、y diodes. Due to the low power MOSFET turn-on resistance, switch time is short, high input impedance，it greatly reduces the wastage of the switching converter rectifier, improve work efficiency, so it becomes a low-voltage high-current power converter rectifier device of choice. Synchronous rectifie
9、r technology combined with the appropriate circuit topology, low-cost high-efficiency converter can be obtained. The flyback converter circuit has advantages of simple topology, input and output electrical isolation, voltage rise/drop range is wide, multiplexed output easily, therefore it is widely
10、used in high voltage, small power occasions, widely used in the 5150w power supply. This paper introduces the design of flyback converter with low voltage and large current based on synchronous rectification, compares the flyback converter with different operation mode, and researches the flyback ci
11、rcuit, synchronous rectification technology. And this paper introduces the principle of Synchronous Rectifier Reverse Converter.This paper analyses the flyback synchronous rectifier circuit theoretically, and establishes analysis of mathematical models, and it designs a 85265V input, single flyback
12、switch power output of 3V/10A. Adopt the VIPer53 power IC and the power of the MOS by side to implement the rectifier output. Both the theoretical analysis and experimental results test and verify that Synchronous rectification in low voltage high current circuit has the obvious effect to improve th
13、e efficiency of the switch power supply, and flyback synchronous rectifier circuit has great practical value in the low voltage and high current switching power supply of small power.Key words: Synchronous rectification; Flyback converter; Soft switch; MOSFET;VIPer533目目 录录摘 要.1 Abstract.2目 录.3 第一章 引 言.4 1.1 选题的背景和意义 .4 1.2 低压大电流开关电源未来的发展新技术.4 1.3 本课题的主要研究方向与工作内容.6 1.3.1 本课题创新点 .6 1.3.2 本课题难点.
