Ke molao-motheo ofe o sebetsang oa cooker ea induction

1. Potoloho e ka sehloohong
Setšoantšong, borokho ba rectifier BI bo fetola motlakase oa motlakase (50HZ) hore e be motlakase oa DC. L1 e khangoa 'me L2 ke khoele ea motlakase. IGBT e khannoa ke sekhahla sa rectangular ho tloha potolohong ea taolo. Ha IGBT e buletsoe, hona joale e phallang ka L2 e eketseha ka potlako. Ha IGBT e khaotsoe, L2 le C21 li tla ba le letoto la resonance, 'me C-pole ea IGBT e tla hlahisa molumo o phahameng oa motlakase fatše. Ha pulse e theohela ho zero, lebelo la koloi le eketsoa ho IGBT hape ho etsa hore e sebetse. Ts'ebetso e kaholimo e ea pota-pota, 'me leqhubu le ka sehloohong la maqhubu a motlakase le ka bang 25KHZ le qetella le hlahisoa, le etsang hore pitsa ea tšepe e behoe holim'a poleiti ea ceramic e hohela eddy current le ho etsa hore pitsa e chese. Khafetsa ea letoto la resonance e nka liparamente tsa L2 le C21. C5 ke capacitor ea filthara ea matla. CNR1 ke varistor (surge absorber). Ha motlakase oa motlakase oa AC o phahama ka tšohanyetso ka lebaka le itseng, o tla khutsufatsoa hang-hang, o tla phakisa fuse kapele ho sireletsa potoloho.

2. Phepelo ea motlakase e thusang
Motlakase oa ho fetola o fana ka li-circuits tse peli tse tsitsitseng: + 5V le + 18V. + 18V ka mor'a ho lokisoa ha borokho e sebelisoa bakeng sa potoloho ea drive ea IGBT, IC LM339 le fan drive circuit li bapisoa ka mokhoa o ts'oanang, 'me + 5V ka mor'a ho tsitsisa ha motlakase ke "terminal voltage stabilizing circuit" e sebelisetsoa MCU ea mantlha ea taolo.

3. Fane e phodileng
Ha matla a buletsoe, taolo e kholo ea IC e romela lets'oao la fan drive (FAN) ho boloka fan e ntse e potoloha, ho hema moea o batang oa kantle ho 'mele oa mochini, ebe o ntša moea o chesang o tsoang lehlakoreng le ka morao la mochini oa mochini. ho finyella morero oa ho senya mocheso mochine, e le ho qoba ho senyeha le ho hlōleha ha likarolo ka lebaka la mocheso o phahameng oa mocheso o sebetsang. Ha fan e emisa kapa mocheso oa mocheso o fokola, mitha ea IGBT e kenngoa ka thermistor ho fetisetsa pontšo ea mocheso o feteletseng ho CPU, ho emisa ho futhumatsa, le ho fumana tšireletso. Ka nako ea matla a ho sebetsa, CPU e tla romela lets'oao la ho bona fan, ebe CPU e tla romella lets'oao la fan drive ho etsa hore mochini o sebetse ha mochini o sebetsa ka mokhoa o tloaelehileng.

4. Taolo ea kamehla ea mocheso le potoloho ea tšireletso e feteletseng
Mosebetsi o ka sehloohong oa potoloho ena ke ho fetola mocheso o fetolang mocheso oa motlakase oa khanyetso ho ea ka mocheso o utloahalang ke thermistor (RT1) tlas'a poleiti ea ceramic le thermistor (mocheso o fokolang oa mocheso) ho IGBT, ebe o e fetisetsa ho e kholo. laola IC (CPU). CPU e etsa lets'oao le mathang kapa le emisang ka ho bapisa boleng ba mocheso o behiloeng kamora phetoho ea A / D.

5. Mesebetsi ea mantlha ea taolo e kholo ea IC (CPU)
Mesebetsi ea mantlha ea 18 pin master IC ke e latelang:
(1) Matla a ON/OFF a ho fetola taolo
(2) Matla a ho futhumatsa / taolo ea kamehla ea mocheso
(3) Taolo ea mesebetsi e fapaneng ea othomathiki
(4) Ha ho ho sibolloa ha mojaro le ho koala ha othomathike
(5) Ts'ebetso ea bohlokoa ea ho lemoha
(6) Tšireletso e phahameng ea mocheso ka har'a mochine
(7) Ho hlahloba lipitsa
(8) Tsebiso ea ho chesa ka holim'a sebōpi
(9) Taolo ea fan e batang
(10) Taolo ea lipontšo tse fapaneng tsa phanele

6. Laola potoloho ea hona joale ea ho lemoha
Potolohong ena, T2 (transformer) e hokahane ka letoto ho ea moleng o ka pele ho DB (borokho bo lokisang), kahoo motlakase oa AC o lehlakoreng la bobeli la T2 o ka bonahatsa phetoho ea hona joale ea ho kenya. Voltage ena ea AC e fetoloa motlakase oa DC ka D13, D14, D15 le D5 tokiso e felletseng ea maqhubu, 'me motlakase o romelloa ka kotloloho ho CPU bakeng sa phetolo ea AD kamora karohano ea motlakase. CPU e ahlola boholo ba hona joale ho latela boleng ba AD bo fetotsoeng, e lekanya matla ka software mme e laola boholo ba tlhahiso ea PWM ho laola matla le ho bona mojaro.

7. Khanna potoloho
Potoloho e matlafatsa tlhahiso ea lets'oao la pulse ho tloha potolohong ea phetoho ea bophara ba pulse ho ea ho matla a lets'oao a lekaneng ho khanna IGBT ho bula le ho koala. Ha bophara ba sekhahla sa phalliso se pharalla, nako ea ho bula ea IGBT e telele. Ha seapehi sa coil se na le matla a maholo a ho ntša li-coil, matla a mollo a phahame.

8. Synchronous oscillation loop
The oscillating circuit (sawtooth wave generator) e entsoeng ka synchronous discovery loop e entsoeng ka R27, R18, R4, R11, R9, R12, R13, C10, C7, C11 le LM339, eo maqhubu a eona a oscillating a lumellanang le maqhubu a sebetsang a moapehi tlas'a Ho feto-fetoha ha molumo oa PWM, ho hlahisa pulse e lumellanang ka pin 14 ea 339 ho khanna bakeng sa ts'ebetso e tsitsitseng.

9. Potoloho ea tšireletso ea surge
Potoloho ea tšireletso ea surge e entsoeng ka R1, R6, R14, R10, C29, C25 le C17. Ha ts'ebetso e phahame haholo, pin 339 2 e hlahisa boemo bo tlaase, ka lehlakoreng le leng, e tsebisa MUC ho emisa matla, ka lehlakoreng le leng, e tima letšoao la K ka D10 ho tima motlakase oa motlakase.

10. Potoloho ea ho lemoha matla a matla
Potoloho ea motlakase ea motlakase e entsoeng ka D1, D2, R2, R7, le DB e sebelisetsoa ho bona hore na motlakase oa motlakase o ka har'a 150V ~ 270V ka mor'a hore CPU e fetole ka ho toba leqhubu le lokisitsoeng la pulse AD.

11. Taolo ea motlakase e phahameng hang hang
R12, R13, R19 le LM339 li entsoe. Ha motlakase oa morao o tloaelehile, potoloho ena e ke ke ea sebetsa. Ha motlakase o phahameng oa hang-hang o feta 1100V, pin 339 1 e tla hlahisa bokhoni bo fokolang, e theole PWM, e fokotse matla a tsoang, e laole motlakase oa morao, e sireletse IGBT, 'me e thibele ho senyeha ha overvoltage.