基于软开关技术

河南机电高等专科学校毕业设计(论文)基于软开关技术逆变系统系部：自动控制系专业：电气自动化班级：113学生姓名：李岩学号：111415308指导教师：侯志坚二零一四年四月编号摘要I摘要本文针对硬开关型逆变器研究存在开关损耗大、频率进一步提高困难等问题，介绍和研究了开关损耗小、频率更高的软开关型弧焊逆变器，并着重讨论了相移控制串联谐振式零电压零电流软开关全桥逆变的原理、特点以及它如何利用高频变压器漏感实现超前桥臂的零电压开通和利用隔直流电容实现滞后桥臂的零电流关断，此外，还对软开关的技术特点进行分析和讨论。相移逆变电路的全桥电路把软开关技术和PWM控制技术有机结合在一起，从而在大范围内实现PWM控制，而在功率器件的换流期间实现功率器件的零电压软开关技术，降低了开关损耗，减少了由于密勒效应引起的干扰现象，并且系统的体积和重量得以减少，功率器件所承受的开关应力也小，具有很大的优越性。对比分析表明，软开关型比硬开关型更具有优越性和更值得推广使用。关键词：硬开关型逆变器；软开关弧焊逆变器；零电压零电流；PWM控制；相移控制串联谐振AbstractIIAbstractThisarticleinviewofthehardswitchtypeinverterstudiesinswitchloss.Frequencytofurtherimprovethedifficulty,andintroducedtheresearchswitchullagesmall,frequencyhighersoftswitchtypearcweldinginverter,andemphasizesthephaseshiftcontrolseriesresonantzerovoltagezerocurrentsoftswitchthewholebridgeoftheinverterprinciple,characteristicandithowtousehighfrequencytransformerleakageareaheadofthearmsofthebridgerealizezeroopenandusethedcvoltageletrealizethearmsofthezerocurrentlagbridgeturnedoff,inaddition,alsowithsoftswitchtechnologycharacteristicsareanalyzedanddiscussed.PhaseshiftinvertercircuitsofthewholebridgecircuitofthesoftswitchtechnologyandPWMcontroltechnologyincombinationwith,largescalerealizePWMcontrol,andinthepowerofthedeviceduringthecommutationrealizepowercomponentszerovoltagesoftswitchtechnology,andtoreducetheswitchloss,reducetheeffectoftheinterferencecausedbymillerphenomenon,andthesystemthebulkandweightbereducedpowercomponentsareunderstressswitchissmall,havealotofadvantages.Contrastanalysisshowsthat,thesoftswitchtypethanthehardswitchtypehasmoreadvantagesandmoreisworthpopularizing.Keyword：Hardswitchingtypeinverter;Softswitcharcweldinginverter;Zerovoltagezerocurrent;PWMcontrol;Phaseshiftcontrolofnetwork目录i目录第1章绪论....................................................................................................................1第2章软开关技术基础................................................................................................32.1引言....................................................................................................................32.2PWM脉宽调制原理...........................................................................................32.3开关与损耗........................................................................................................42.3.1软开关发展的三阶段..............................................................................42.3.2软开关损耗...............................................................................................4本章小结...................................................................................................................6第3章软开关的分类....................................................................................................73.1软开关型逆变主电路.........................................................................................73.2基本的软开关逆变主电路介绍和了解............................................................73.2.1零电流开关（ZCS）谐振逆变主电路...................................................73.2.2零电压开关（ZVS）谐振逆变主电路...................................................73.2.3多谐振（MRC）逆变主电路..................................................................83.2.4串联谐振逆变主电路...............................................................................83.2.5并联谐振逆变主电路...............................................................................93.2.6E类逆变主电路.......................................................................................93.2.7直流母线谐振逆变主电路....................................................................103.2.8相移控制的全桥逆变主电路................................................................10本章小结.................................................................................................................12第4章零电压零电流PWM移相控制..........................................................................134.1软开关型全桥逆变电路的拓扑结构...............................................................134.1.1单端软开关型逆变主电路.....................................................................134.1.2软开关型全桥逆变主电路.....................................................................134.2相移控制电路及其新发展..............................................................................164.2.1用饱和电抗器减少其占空比丢失的移相控制电路............................164.2.2用双电抗器整流的相移控制电路........................................................174.2.3用辅助电路拓宽软开关范围的移相控制逆变主电路........................174.2.4相移控制的零电压、零电流开关电路.................................................184.2.5相移控制的串联谐振全桥逆变主电路................................................19本章小结.................................................................................................................20目录ii第5章软开关逆变器在焊机中的应用......................................................................215.1软开关逆变器的主电路...................................................................................215.1.1降压整流电路.........................................................................................215.1.2软开关逆变电路....................................................................................225.2控制电路.....................