Uthini umgaqo osebenzayo we-induction cooker

1. Isekethe ephambili
Kumzobo, ibhulorho ye-BI yokubuyisela itshintsha amandla ombane (i-50HZ) yombane ibe yi-voltage ye-DC. I-L1 yi-coil kwaye i-L2 yi-coil ye-electromagnetic coil. I-IGBT iqhutywe yi-pulse rectangular ukusuka kwisiphaluka solawulo. Xa i-IGBT ivuliwe, i-current flowing through L2 iyanda ngokukhawuleza. Xa i-IGBT inqunyulwa, i-L2 kunye ne-C21 iya kuba ne-resonance series, kunye ne-C-pole ye-IGBT iya kuvelisa i-high-voltage pulse emhlabeni. Xa i-pulse yehla ukuya kwi-zero, i-drive pulse yongezwa kwi-IGBT kwakhona ukuze iqhube. Le nkqubo ingasentla iyajikeleza kwaye ijikeleza, kwaye i-electromagnetic wave engundoqo emalunga ne-25KHZ iye yaveliswa ekugqibeleni, nto leyo eyenza ukuba umzantsi wembiza yentsimbi ubekwe kwipleyiti yeceramic yenze i-eddi yangoku kwaye yenze imbiza ibe shushu. I-frequency of series resonance ithatha iiparameters ze-L2 kunye ne-C21. I-C5 yi-capacitor yokucoca amandla. I-CNR1 yi-varistor (i-surge absorber). Xa i-voltage yonikezelo lwamandla e-AC iphakama ngokukhawuleza ngenxa yesizathu esithile, iya kuba mfutshane ijikelezwe ngokukhawuleza, eya kubetha ngokukhawuleza i-fuse ukukhusela isiphaluka.

2. Umbane oncedisayo
Ukunikezelwa kwamandla okutshintsha kunika iisekethe ezimbini zokuzinzisa amandla ombane: + 5V kunye + 18V. I-+18V emva kokulungiswa kwebhulorho isetyenziselwa isekethe yokuqhuba ye-IGBT, i-IC LM339 kunye nesekethe ye-fan drive zithelekiswa ngokufanayo, kunye ne-+5V emva kokuzinziswa kwamandla ombane yisekethe ye-terminal emithathu yokuzinzisa i-terminal isetyenziselwa ulawulo oluphambili lwe-MCU.

3. Ifeni yokupholisa
Xa amandla evuliwe, ulawulo oluphambili lwe-IC luthumela isignali ye-fan drive (FAN) ukugcina i-fan ijikeleza, iphefumlele umoya obandayo wangaphandle kumzimba womatshini, kwaye emva koko ikhuphe umoya oshushu ukusuka kwicala elingasemva lomatshini womatshini. ukufezekisa injongo yokutshatyalaliswa kobushushu kumatshini, ukwenzela ukuba ugweme umonakalo kunye nokungaphumeleli kwamacandelo ngenxa yokushisa okuphezulu kwendawo yokusebenza. Xa i-fan iyeka okanye ukuchithwa kobushushu kungalunganga, imitha ye-IGBT ifakwe kwi-thermistor ukuhambisa umqondiso wokushisa obushushu kwi-CPU, ukuyeka ukufudumeza, kunye nokufezekisa ukhuseleko. Okwangoku amandla avuliwe, i-CPU iya kuthumela isignali yokubona abalandeli, kwaye ke i-CPU iya kuthumela isignali yokuqhuba i-fan ukwenza umatshini usebenze xa umatshini uqhuba ngokwesiqhelo.

4. Ukulawulwa kweqondo lokushisa rhoqo kunye nesekethe yokukhusela ukushisa
Umsebenzi ophambili wale sekethi kukutshintsha ubushushu obutshintshayo iyunithi yombane wokumelana ngokweqondo lobushushu elibonwa yi-thermistor (RT1) phantsi kwepleyiti yeceramic kunye ne-thermistor (i-coefficient yeqondo elibi) kwi-IGBT, kwaye uyidlulisele kweyona nto iphambili. ulawulo IC (CPU). I-CPU yenza isignali esebenzayo okanye yokumisa ngokuthelekisa ixabiso elimiselweyo lobushushu emva kokuguqulwa kwe-A/D.

5. Imisebenzi ephambili yolawulo oluphambili lwe-IC (CPU)
Imisebenzi ephambili ye-18 pin master IC yile ilandelayo:
(1) Amandla ON/OFF ulawulo lokutshintsha
(2) Amandla okufudumeza / ulawulo lobushushu rhoqo
(3) Ukulawulwa kwemisebenzi eyahlukeneyo ezenzekelayo
(4) Akukho ukubonwa komthwalo kunye nokuvalwa ngokuzenzekelayo
(5) Ukufumanisa igalelo lomsebenzi ongundoqo
(6) Ukukhuselwa kobushushu obuphezulu ngaphakathi kumatshini
(7) Ukuhlolwa kweengqayi
(8) Isaziso sokufudumala komphezulu wesithando somlilo
(9) Ukupholisa ukulawulwa kwefeni
(10) Ulawulo lwemiboniso eyahlukeneyo yephaneli

6. Layisha isiphaluka sokufumanisa ngoku
Kulo mjikelezo, i-T2 (i-transformer) ixhunyiwe kwichungechunge kumgca ophambi kwe-DB (i-bridge rectifier), ngoko i-AC voltage kwi-T2 ye-second side ingabonakalisa utshintsho lwe-input current. Lo mbane we-AC uguqulwa ube ngumbane we-DC ngokusebenzisa i-D13, i-D14, i-D15 kunye ne-D5 yokulungiswa kwamaza ngokupheleleyo, kwaye umbane uthunyelwa ngokuthe ngqo kwi-CPU yokuguqulwa kwe-AD emva kokwahlulwa kombane. I-CPU igweba ubungakanani bangoku ngokwexabiso le-AD eliguquliweyo, ibala amandla ngesoftware kwaye ilawula ubungakanani bemveliso yePWM ukulawula amandla kunye nokubona umthwalo.

7. Qhuba isekethe
Isekethe ikhulisa isiphumo sophawu lwe-pulse ukusuka kwisekethe yohlengahlengiso lobubanzi be-pulse ukuya kumandla omqondiso owaneleyo wokuqhuba i-IGBT ukuvula nokuvala. Ububanzi be-pulse yegalelo, ixesha lokuvula i-IGBT lide. Okukhona amandla aphumayo e-coil cooker, kokukhona aphakama amandla omlilo.

8. I-synchronous oscillation loop
I-oscillating circuit (i-sawtooth wave generator) yenziwe nge-synchronous ubhaqo loop eyenziwe nge-R27, i-R18, i-R4, i-R11, i-R9, i-R12, i-R13, i-C10, i-C7, i-C11 kunye ne-LM339. Ukumodareyitha kwe-PWM, kukhupha i-synchronous pulse ngokusebenzisa i-pin 14 ye-339 ukuqhuba umsebenzi ozinzileyo.

9. Isekethe yokukhusela i-Surge
Isekethe yokukhusela i-Surge ihlanganiswe ne-R1, i-R6, i-R14, i-R10, i-C29, i-C25 kunye ne-C17. Xa i-surgery iphezulu kakhulu, i-pin 339 2 ikhupha umgangatho ophantsi, kwelinye icala, yazisa i-MUC ukumisa amandla, kwelinye icala, ivala umqondiso we-K ngokusebenzisa i-D10 ukucima amandla okuqhuba.

10. Isekethe yokufumanisa amandla ombane oguqukayo
Isekethe yokufumanisa i-voltage ehlanganiswe ne-D1, i-D2, i-R2, i-R7, kunye ne-DB isetyenziselwa ukufumanisa ukuba umbane wombane wombane ungaphakathi koluhlu lwe-150V ~ 270V emva kokuba i-CPU iguqule ngokuthe ngqo i-AD ye-pulse wave.

11. Ulawulo lwamandla ombane aphezulu ngoko nangoko
I-R12, i-R13, i-R19 kunye ne-LM339 zenziwe. Xa i-voltage yangasemva iqhelekile, le sekethi ayiyi kusebenza. Xa i-voltage ephezulu ngokukhawuleza idlula i-1100V, i-pin 339 1 iya kukhupha amandla aphantsi, ihlehlise i-PWM, inciphise amandla aphumayo, ilawule i-voltage yangasemva, ikhusele i-IGBT, kwaye ithintele ukuphuka kwe-overvoltage.