高频软开关逆变式充电器
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密 惠 保
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随着电力电子技术的发展，用电设备对电源的要求不断提高， 开关电源正逐步向着高效率、大功率密度、高可靠性、低电磁抗干扰、无噪声、维修方便等方向发展。瞬时同步整流技术由于实现简单，响应速度快和具有自然限流等优点而得到广泛地应用。
本文在分析DC-DC技术发展的基础之上，用Buck电路，运用MAX767系列芯片研究一条简洁的途径实现DC-DC直流变换，即应用同步整流技术控制方法，来实现变换器高效工作。该变换器主电路结构简单可靠，可以实现输入： DC 4.5～5.5V，输出DC 5V/
分析其系统工作原理的过程，为该变换方法和应用提供了理论基础，通过同步整流技术的方法和应用MOSFET管的设计，较理想的实现了DC-DC变换器的设计要求。
最后，运用这些设计成功的设计出DC-DC直流变换器。
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本文主要介绍Buck电路和MAX767系列DC设计，工作原理和主要参数的设计，并对系统的外特性和稳定性作了分析。
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关键词：DC-DC直流变换; 同步整流技术; MOSFET管
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With the development of the electronic technology, the higher requirement of Power Supply are raised including high efficiency, high power density, low EMI, and rapid dynamic response. A hysterics-band instantaneous current control PWM Technique is popularly used because of its simplicity of implementation, fast current control response, and inherent peak current limiting capability.
The design of the foundation of upper，with buck circuit，handle max767 series chip look into a slip of compact avenue realize dc-dc direct current transform，namely application synchronous rectification technical control means，came realize convector highly active wrought of the text at analyses dc-dc technological development. be one's turn convector trunk feeder structure simplicity credibility，could realize import：DC 4.5～5.5v，output dc 5V /
Both that of analyses his system principle of operation course，for be one's turn transform method and application supply know clearly rationale，through the medium of synchronous rectification technical means and application MOSFET table design，compare ideal realize know clearly dc-dc convector' design requirement.
At the last，handle these be designed for wrought 'thought out dc-dc dc converter to.
The design，combine versus systemic external characteristic and stability did know clearly analyses of the both text mostly introduce buck circuit and max767 series DC design，principle of operation and major parameter.
keyword：dc-dc direct current transform synchronous rectification technology mosfet tube。
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