電磁爐的原理與維修（The principle and maintenance of electromagnetic stove）

電磁爐的原理與維修（Theprincipleandmaintenanceofelectromagneticstove）

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[principle]electromagneticovenprincipleandmaintenanceheat[font:smallbig]

Theprincipleandmaintenanceofelectromagneticstove

Author:tknjdarticlesource:BBShits:15387updatetime:2004-9-1

Theprincipleandmaintenanceofelectromagneticstove

Preface

Withtheimprovementoflivingstandards,thepeoplegraduallyacceptthecookingutensilsforsafetyandsanitation,andtheelectromagneticstovehasalsoenteredthousandsofhouseholds.

Inordertomaketheservicenetworkcanusetheelectromagneticovenparts,fastandaccurateelectromagneticfurnacemaintenance,compiled"principleandmaintenance"oftheelectromagneticoven,thecontentofPD16asatemplate,thepaperanalyzestheprincipleoftheelectromagneticoven,hopethatwecanthroughtheirownprincipletoanalyzethefault,soastodrawinferencesthepurposeof.

Chapter1theworkingprincipleofinductioncooker

1.Theworkingprincipleofinductioncooker

Whentheelectromagneticoveninnormaloperation,alternatingmagneticfieldgeneratingcoilelectromagneticovenwireonthediscatthebottomofthepotbottomofthepottomakerepeatedcuttingchangesproducingringcurrent(WoLiu),andtheheatgeneratedbytheshortthermaleffectoflowresistanceandhighcurrent.

2,PD16electromagneticfurnaceschematic

3,PD16electromagneticovenworkblockdiagram

Thesecondchapter,mainfunctionofinductioncooker

1.Ceramicplate:importedhightemperatureresistantcrystallineceramicplate.

2、highvoltagemainboard:constitutethemaincurrentloop.

3、lowvoltagemainboard:computercontrolfunction.

4,LEDcircuitboard:displaytheworkingstateandtransferoperationinstructions.

5,thedisk:high-frequencyalternatingcurrentconvertedintoalternatingmagneticfield(PAN).

6fancomponents:heatsinkauxiliarycomponent(FAN).

7,IGBT:throughthelowcurrentsignal,controllargecurrenton-off(IGBT).

8.Bridgerectifierblock:convertsACpowertoDCpowersupply(BD101).

9、thermistorparts:theheatsignalistransmittedtothecontrolcircuit.

10、thermalswitchmodule:sensingtheIGBToperatingtemperature,therebyprotectingtheIGBTduetooverheatingdamage.

Thethirdchapter,electromagneticovenintegrationblockfunction

1,C80C49-143A:centralprocessorintegrationfast(Ic1).

2&SN7407N:highvoltageoutputbuffer/driver(Ic2).

3,HD74LS145:Four-tenlinedecoder/driver(Ic4).

4,LM339:lowpower,lowoffsetvoltagecomparators(Ic5,IC6).

5,TA8316S:drive(Ic3).

Thefourthchapteristheworkingprincipleofinductioncooker(PD16)

Electromagneticfurnace220VpowerfrequencycommunicationbyAC

INsocketaccess,throughthefuseF101,topreventtheinternalcircuitoverloadandshortcircuit.VAisashuntvoltagesensitivecircuit,whichpreventstheexternalsupplyvoltagefrombeingtoohigh,andoftenprotectsitselffromthesecurityofthesecondarycircuitafterburningitself.C101isafiltercapacitorwithacapacityof2UF.C101levelhighpowerrectifierbridgerectifierblockcanbeprelevel220VACforpulsatingDCsmoothingviapulsatingDCchokeandC102,DCwillberelativelystableforPANtolowertheelectromagneticwirecoil,LCcoilandC103oscillationcircuitPANoscillationcapacitor,therebyonlinediskproducesalternatingmagneticfield.

ThesecondstageofthePANelectromagneticcoilisT102currentsamplingtransformer,andthecurrentsignalistransmittedtothevoltagecomparatorLM339throughthesecondaryoftheT102todetect.

TherearstageofT102isahighvoltageprotectiondiodeD,whichactsasaprotectionagainstIGBTandpreventsreversehighvoltagebreakdownIGBT.TheIGBTcontrolisdrivenbythedriverTA8316S,

TA8316Soutput14KHzfrequencypulse,accordingtoTA8316SoutputpulsewidthtoadjusttheIGBTon-offtimelength,soastoadjustthepowerrequirements.

LM339isvoltagecomparator,PD16usestwoblocksofLM339:oneisIC5,themainfunctionispotdetectionandtemperaturedetection.TheotherisIC6,andthemainfunctionsarecurrentdetectionandvoltagedetection.ThetwoLM339comparatorsoftheIC5andtheIC6feedthedetectionsignalsbacktotheTA8316Sdrivertoachievethepoweradjustmentrequirements.

TheheatsensitiveresistanceRTinthemiddleofthelineplateischangedintoalevelchangethroughthechangeofheat,andthenthesignalistransmittedtotheTA8316SthroughtheQ601triodetoadjustthemagnitudeofthepowersoastoadjustthetemperatureofthecooker.

AtemperatureswitchK1IGBTheatfixedaluminumblock,whentheIGBToverheating,thetemperatureswitchK1on-offstatechanges,therebyconnectingtheIC1chipofthefoot,thefootlevelchangesthroughthelevel,sothattheIC1chippinresetshutdown.

ThefanpoweriscontrolledbytheIC4inthefoothighleveloutputtothetriodeQ703,sothatQ703isconductedby12VDCfanoperation.

ThepowersupplyofthecontrolcircuitismainlycomposedofprimaryaccessoftheT101transformer,andthesecondaryoutputisconnectedwiththreesetsofseriesvoltagestabilizingcircuits.Agroupof+5VvoltageisformedthroughZD204,C207,R204andQ203.ThemainsupplyblockisIC1powersupply.Asetof+24VvoltageisformedthroughZD201,C203,R203andQ201,andthemainsupplyisintegratedIC3powersupply.AnothergroupthroughZD203,C205,R203,Q202,R202form+12Vand+10Vpowersupply,+12Vpowersupplymainlyfan,+10VmainlysupplyIC6,Q301,ICS,Q602,Q601,Q501powersupply.

Thefifthchapterisfaultanalysisandmaintenancemethod

Phenomenon1,startburninginsurance.

Thefirstlegoftheelectromagneticwirecoildisconnectforinsurancetube,measurethecapacitancevoltageacrosstheDCoutputvoltageofC102,thegeneralbridgerectifieris220V-300V,ifthereisnovoltageorcontinuetofuse,judgeforthebridgerectifierblockbad.

Analysisofthereason:iftherectifierbridgebreakdown,then220VACdirectshortcircuit.

ThevoltageatbothendsoftheC102isjudgedtobeIGBTbad,andthetroubleiseliminatedafterreplacing.

Analysisofthereasons:C102voltageatbothends,indicatingthatthebridgerectifierDCoutputisnormal,ifthetwoIGBToutputpinbreakdown,itisequivalenttoDCshortcircuit.

Thebridge,thebridgeandtheIGBTarenotbad,buttheyarestillburned.TheIA8316Sblockisbrokenandreplaced.

Analysisofthereasons:TA8316Soutputduetothepulseangleistoolarge,resultinginoverloadingofthephenomenonofIGBT

2,fandoesnotwork

PleaseturnoffthefanFAN,inserttheline,checkwhetherthereis12Vpowersupply,ifany,thefanmotorisbad.

Analysisofthereasons:thepowersupplyisnormal,usuallyfanmotorisshortcircuitorcircuitbreaker.

FANinsertionline,no12Vvoltage,drivetriodeQ703emitterbreakdown,changetoQ703,troubleshooting.

Analysis:whentheQ703isnotbad,theintegratedblockIC4isbad,replacedwiththeIC4integrationblock,troubleshooting.

ThefanmotorandQ703arenotbad,theintegratedcircuitblockIC4isbroken,andtheIC4integratedblockisreplaced,andthemalfunctionisrelieved.

Reasonanalysis:iftheseventhpinoftheintegratedcircuitblockIC4hasnohighleveloutput,thentheemitteroftheQ703hasnobiasvoltage,andtheintegratedpoleofQ703stillcannotbeconducted,andthepowersupplyisinastateofopencircuit.

Phenomenon3,bootoperationshowsnormal,butnotheated.

MeasurementofthetertiaryfootofTA8316Swhetherthereisno18Vvoltage,ifnot,checkwhethertheQ201hasanybreakdownandwhethertheZD201hasanybreakdown.Ifthereisabreakdown,replacethetrouble.

Analysisofthereasons:iftheTA8316Shasno18Vvoltage,thefaultpointshouldbeinthepowersupplyseriesvoltageregulatorcircuit,soitisnecessarytocheckthebasiccomponentsoftheseriesvoltageregulatorcircuit.

Second,theTA8316Shas18Vvoltage,thefaultshouldbeintheIC3integratedblockTA8316S,replacedaftertroubleshooting.

Causeanalysis:LEDboarddisplayandnormaloperation,acomputercontrolcircuitisbasicallynormal,fuse,high-pressureplateisbasicallynormal,justbecausetheTA8316SnopulseoutputtotheIGBTcontrol,IGBTcannotconduction.

Phenomenon4,aftertheboot,thepanellighthasbeenflashing.

Thecrystaloscillatorisbroken,andthefaultisremovedafterchanging.

Analysisofthereasons:theoscillatorisbad,resultinginCPUcentralprocessorwithoutclockfreque