Ndeipi iyo nheyo yekushanda ye induction cooker

1. Dunhu guru
Mumufananidzo, bhiriji rekugadziridza BI rinoshandura frequency yemagetsi (50HZ) voltage kuita iri pulsating DC voltage. L1 inokachidzwa uye L2 ndeye electromagnetic coil. Iyo IGBT inotungamirwa nerectangular pulse kubva kudunhu rekutonga. Kana IGBT ikavhurwa, ikozvino inoyerera kuburikidza neL2 inowedzera nekukurumidza. Kana IGBT yagurwa, L2 neC21 ichave neyakateedzana resonance, uye C-pole yeIGBT inoburitsa yakakwira-voltage pulse pasi. Kana iyo pulse inodonha kusvika zero, iyo drive pulse inowedzerwa kune IGBT zvakare kuti iite conductive. Maitiro ari pamusoro apa anotenderera achitenderera, uye main frequency electromagnetic wave anosvika 25KHZ anozopedzisira agadzirwa, izvo zvinoita kuti poto yesimbi iiswe pandiro ye ceramic induce eddy current uye kuita kuti hari ripise. Iyo frequency yenhevedzano resonance inotora iyo paramita yeL2 uye C21. C5 ndiyo simba sefa capacitor. CNR1 is varistor (surge absorber). Kana iyo AC magetsi emagetsi asimuka kamwe kamwe nekuda kwechimwe chikonzero, ichava pfupi kutenderera ipapo, iyo ichakurumidza kuridza fuse kudzivirira redunhu.

2. Simba rekubatsira
Iyo yekuchinjisa magetsi inopa maviri voltage inodzikamisa maseketi: + 5V uye + 18V. Iyo + 18V mushure mekugadzirisa bhiriji inoshandiswa kutenderera dhiraivha yeIGBT, iyo IC LM339 uye fan dhiraivha yedunhu inofananidzwa synchronously, uye iyo + 5V mushure mekudzikamiswa kwevoltage neatatu terminal voltage stabilizing circuit inoshandiswa kune main control MCU.

3. Kutonhora feni
Kana simba rikabatidzwa, main control IC inotumira chiratidzo chefan drive (FAN) kuchengetedza fan ichitenderera, infemera mweya unotonhora wekunze mumuviri wemuchina, wozoburitsa mweya unopisa kubva kumashure kwemuviri wemashini. kuzadzisa chinangwa chekupisa kupisa mumushini, kuitira kuti udzivise kukuvadzwa uye kutadza kwezvikamu nekuda kwekushisa kwakanyanya kwekushanda nharaunda. Kana iyo fan yamira kana kupisa kupisa kwakashata, iyo IGBT mita inonamirwa ne thermistor kuendesa iyo overtemperature chiratidzo kuCPU, kumisa kudziyisa, uye kuwana dziviriro. Panguva yesimba, iyo CPU inotumira chiratidzo chekuona fan, uye ipapo CPU inotumira chiratidzo chekutyaira fan kuita kuti muchina ushande kana muchina uchishanda zvakajairika.

4. Constant tembiricha kutonga uye overheat kudzivirira redunhu
Basa guru redunhu iri ndere kushandura tembiricha inoshandura voltage unit yekupikisa zvinoenderana nekushisa kunonzwa ne thermistor (RT1) pasi peceramic plate uye thermistor (negative tembiricha coefficient) paIGBT, uye kuiendesa kune iyo huru. kudzora IC (CPU). Iyo CPU inogadzira inomhanya kana kumisa chiratidzo nekuenzanisa iyo set tembiricha kukosha mushure mekushandura kweA / D.

5. Mabasa makuru ekutonga kukuru IC (CPU)
Iwo makuru mabasa e18 pini master IC ndeaya anotevera:
(1) Simba ON / OFF switching control
(2) Kupisa simba / kudzora tembiricha nguva dzose
(3) Kudzora kweakasiyana otomatiki mabasa
(4) Hapana kuona mutoro uye otomatiki kudzima
(5) Key function input inoonekwa
(6) Kudzivirirwa kwekushisa kwakanyanya mukati memuchina
(7) Kuongororwa kwepoto
(8) Furnace pamusoro pekupisa chiziviso
(9) Kutonhodza feni kudzora
(10) Kudzora kweakasiyana mapaneru anoratidza

6. Rodha yezvino yekuona yedunhu
Mudunhu iri, T2 (transformer) yakabatana munhevedzano kumutsara uri pamberi peDB (bhiriji rectifier), saka iyo AC voltage paT2 yechipiri padivi inogona kuratidza shanduko yekupinza ikozvino. Iyi AC voltage inozoshandurwa kuita DC voltage kuburikidza neD13, D14, D15 uye D5 yakazara wave rectification, uye voltage inotumirwa zvakananga kuCPU yekushandurwa kweAD mushure mekupatsanurwa kwevoltage. Iyo CPU inotonga saizi iripo zvichienderana neyakashandurwa AD kukosha, inoverenga simba kuburikidza nesoftware uye inodzora iyo PWM yekubuda saizi kudzora simba uye kuona mutoro.

7. Dhiraivha dunhu
Dunhu rinowedzera pulse siginecha inobuda kubva kune pulse upamhi gadziriso wedunhu kune simba rechiratidzo rakakwana kutyaira IGBT kuvhura nekuvhara. Iyo yakakura iyo yekupinza pulse hupamhi, iyo yakareba IGBT yekuvhura nguva. Kuwanda kwesimba rekubuda kwecoil cooker, ndiko kuwedzera simba remoto.

8. Synchronous oscillation loop
Iyo oscillating circuit (sawtooth wave jenareta) inoumbwa neiyo synchronous yekuona loop inoumbwa neR27, R18, R4, R11, R9, R12, R13, C10, C7, C11 uye LM339, iyo oscillating frequency inofananidzwa nekushanda kwemubiki pasi pe. PWM modulation, inoburitsa inopindirana pulse kuburikidza nepini 14 ye339 kutyaira kuti ishande yakagadzikana.

9. Surge kudzivirira redunhu
Surge dziviriro yedunhu inoumbwa neR1, R6, R14, R10, C29, C25 uye C17. Kana kuvhiya kwacho kwanyanya, pini 339 2 inoburitsa yakaderera, kune rimwe divi, inozivisa MUC kumisa simba, kune rimwe divi, inodzima K chiratidzo kuburikidza neD10 kudzima drive magetsi kubuda.

10. Dynamic voltage yekuona circuit
Iyo voltage yekuona dunhu inoumbwa neD1, D2, R2, R7, uye DB inoshandiswa kuona kana magetsi emagetsi ari mukati meiyo 150V ~ 270V mushure mekunge CPU yashandura zvakananga yakagadziriswa pulse wave AD.

11. Pakarepo high voltage control
R12, R13, R19 uye LM339 inoumbwa. Kana iyo yekumashure voltage yakajairika, dunhu iri harishande. Kana iyo yekukurumidza yakakwira voltage ichipfuura 1100V, pini 339 1 inoburitsa yakaderera kugona, kudonhedza pasi PWM, kuderedza kubuda simba, kudzora kumashure voltage, kudzivirira IGBT, uye kudzivirira overvoltage kuparara.