中频感应电源的设计说明书

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1、中频感应电源以其加热效率高、速度快，可控性好及易于实现机械化、自动化等优点，已在熔炼、铸造、弯管、热锻、焊接和表而热处理等行业得到广泛的应用。本设计中感应电源采用IGBT作为开关器件，可工作在10Hz〜10kHz频段。它由整流器、滤波器、和逆变器组成。整流器采用三相全桥式整流电路。滤波器滤波采用一个大电容和两个小的电解电容，逆变器主要由PWM控制器SG3525A控制四个IGBT的开通和关断，实现DC-AC的转换。本设计用单片机AT89C52作为控制电路的核心，通过单片机可以实现同步信号，给晶闸管提供脉冲信号，对整个中频电源进行

2、控制和保护。逆变回路采用了快速V-MOS场效应管，由控制器SG3525A进行控制，驱动电路是四个M57962L构成，锁相环CD4046组成的回路由单片机控制，实现了自动频率跟踪。同时设计了过电流检测环节和过载保护环节，控制回路由软件來实现，该电源在保证设备稳定可靠的条件下，能够实现最大的功率调节。关键词：感应加热电源；串联谐振；逆变电路；IGBTAbstractTheIntermediateFrequencyInductionHeatinghasbeenwidelyappliedinmelting,casting,bend,h

3、otforging,welding,SurfaceHeatTreatmentduetoitsadvantagesofhighheatingefficiencyhighspeedeasilycontrolledeasilybeingmechanizedandautomated.Theschemehasmadeaplanofdesignsbasedonthetaskofdesign,designedcorrespondinghardwarecircuitanddeveloped20kWintermediatefrequencyin

4、ductionheatingpowersystcm.ThethesisdiscussestheChoiceofconverterschemeindetail.SeriesResonanceInverterhasanothernameisVoltageInverter.ItsOutputVoltageapproachessquarewaveandloadcurrentapproachessine-wave.InversionmustfollowthePrinciplesofbreakbeforemakeandthereiseno

5、ughdead-timebetweenturn-offandturnoninordertoavoidingdirectthroughinupperandlowerbridges・ThethesisdiscussedtheChoiceofconverterschemeindetailaswellasintroducedthecontrolcircuitofthispowersourceanditsdesignprinciple.Develop20kWintermediatefrequencyinductionheatingpow

6、ersystemwithswitchelementIGBT.MakearesearchonConverterCircuit,controlcircuit,drivercircuitetc.TheCMOSchipthatisappliedinthedesignismainlyPWMControllerSG3525AandopticalcouplerDriveCircuitHCPL-316J.ThecontrolledfeatureofPWMControllerSG3525Aisfullyutilizedintheprocesso

7、fdesign,whichhaswideadjustableoperatingfrequencyanddeadtime,inputundervoltagelockfunctionandtwinchanneloutputcurrent.TheopticalcouplerDriveCircuitHCPL-316JischosenasthedrivenofIGBTduetoitsfunctions,suchasfastswitchspeed(500ns),opticalisolation,thefeedbackoffaultsitu

8、ation,wideoperatingvoltage(15V~30V)，automaticresetandautomaticclosedownetc.KeyWordsinductionheatingpowersupply;seriesresonance；inversecirc