推挽式直流开关电源的设计摘要随着现代通讯技术的飞速发展，对通讯电源的重量、体积、可靠性、效率等提出了更高的要求。而应用于中大功率场合的移相全桥DC/DC变换器具有结构简单、输出功率大、效率高、易实现软开关、功率开关管所承受的电压电流应力小等一系列优点，因此，对它进行研究具有十分重要的意义。本文首先对DC/DC升压变换器的电流触发主电路、输入电路、反馈电路控制芯片、推挽变压器进行了详细的讲解，其中重点对MOS场效应管的损耗问题进行了研究和分析。其次本文也对本实验用到的器件进行了简单的介绍并给出了所需器件的参数，建立了模型并用ProtelAltiumDesigner6.9仿真软件对系统的稳定性进行了分析。最后根据自己的仿真结果做出了实际电路并进调试一切正常，达到了所需要的效果。关键词：DC/DC电压变换器；推挽变压器；反馈电路控制芯片AbstractWiththerapiddevelopmentofmoderncommunicationtechnology,communicationpoweroftheweight,volume,reliability,efficiency,andputforwardhigherrequirements.Thepowerappliedtothephase-shiftedfull-bridgewheretheDC/DCconverterhasasimplestructure,highoutputpower,highefficiency,easytorealizesoft-switching,thepowerswitchisexposedtoaseriesofvoltageandcurrentstressoftheadvantages,therefore,itsstudyisofgreatsignificance.ThisarticlefirstDC/DCboostconvertercurrenttriggeringthemaincircuit,inputcircuit,feedbackcircuitcontrolchip,push-pulltransformerswereindetail.ThefocusoftheMOSFETlossproblemswerestudiedandanalyzed.Secondly,thepaperalsousedinthisstudyabriefintroductiondevicesandgivesthenecessaryparametersofthedevice,theestablishmentofamodelandsimulationusingProtelAltiumDesigner6.9softwaretoanalyzethestabilityofthesystem.Finally,thesimulationresultsaccordingtotheiractualcircuitandthusmadeallthenormaldebugging,achievestherequiredeffect.Keywords:DC/DCboostconverter;push-pulltransformer;feedbackcircuitcontrolchip目录摘要..........................................................................................................................................I1绪论....................................................................................................................11.1开关电源的发展历程....................................................................................................11.2开关电源的分类............................................................................................................11.2.1按驱动方式分类..................................................................................................11.2.2按能量转换过程的类型分类..............................................................................21.2.3按输入与输出是否隔离分类..............................................................................21.2.4按功率开关管关断和开通工作条件分类..........................................................21.3开关电源的特点............................................................................................................21.4本文主要工作................................................................................................................32开关电源的基础知识........................................................................................42.1开关电源DC/DC变换器的软开关技术分类..............................................................42.2开关电源移相全桥DC/DC变换器控制技术..............................................................52.3开关电源常用拓扑结构.........................................................................................
