{"id":1125,"date":"2019-02-24T09:50:43","date_gmt":"2019-02-24T08:50:43","guid":{"rendered":"http:\/\/ok2jnj.ok2kld.cz\/ok2jnj\/?p=1125"},"modified":"2020-04-19T14:21:45","modified_gmt":"2020-04-19T13:21:45","slug":"indukcni-varna-deska-oprava-2-dil","status":"publish","type":"post","link":"https:\/\/ok2jnj.ok2kld.cz\/ok2jnj\/cs\/2019\/02\/indukcni-varna-deska-oprava-2-dil\/","title":{"rendered":"Induk\u010dn\u00ed varn\u00e1 deska – oprava 2.d\u00edl"},"content":{"rendered":"

V minul\u00e9m \u010dl\u00e1nku<\/a><\/strong> jsem se zab\u00fdval principem funkce induk\u010dn\u00ed varn\u00e9 desky a v\u00fdm\u011bnou vadn\u00fdch IGBT modul\u016f. Dnes se zam\u011b\u0159\u00edm na p\u0159\u00ed\u010diny chyby F5 a m\u011b\u0159en\u00ed pracovn\u00edho kmito\u010dtu desky.<\/p>\n

Chyba F5<\/h3>\n

Z n\u00e1vodu k induk\u010dn\u00ed desce je z\u0159ejm\u00e9, \u017ee nefunguje komunikace mezi gener\u00e1torem a \u0159\u00edd\u00edc\u00ed kartou.<\/p>\n

Oprava je pops\u00e1na v diskus\u00edch na webu poradte.cz<\/strong><\/a> a ebastlirna.cz<\/strong><\/a>. V diskusi je zm\u00edn\u011bno n\u011bkolik mo\u017en\u00fdch z\u00e1vad. N\u011bkter\u00e9 se t\u00fdkaj\u00ed mechanick\u00e9ho p\u0159eru\u0161en\u00ed sb\u011brnice, dal\u0161\u00ed z\u00e1vady souvis\u00ed se \u0161panou funkc\u00ed nap\u00e1jec\u00edho zdroje. V m\u00e9m p\u0159\u00edpad\u011b je zapojen\u00ed v po\u0159\u00e1dku, tak\u017ee se zam\u011b\u0159\u00edm na nap\u00e1jec\u00ed zdroj. Ten je sp\u00ednan\u00fd a je zapojen jako blokuj\u00edc\u00ed m\u011bni\u010d kter\u00fd pracuje na 27kHz. Zdroj nap\u00e1j\u00ed mikroprocesor induk\u010dn\u00ed desky po\u0159\u00e1d, i v pohotovostn\u00edm re\u017eimu, kdy deska o\u010dek\u00e1v\u00e1 dotek na tla\u010d\u00edtku power. Nejv\u00edc nam\u00e1han\u00e9 sou\u010d\u00e1stky ve sp\u00ednan\u00e9m zdroji jsou elektrolytick\u00e9 kondenz\u00e1tory a potom sou\u010d\u00e1stky v obvodu ochrany v\u00fdkonov\u00e9ho tranzistoru<\/strong><\/a>.<\/p>\n

Ne\u017e za\u010dnu m\u011bnit sou\u010d\u00e1stky, chci v\u011bd\u011bt, jak vypad\u00e1 nap\u00e1jec\u00ed nap\u011bt\u00ed, kdy\u017e displej zobrazuje chybu F5. Desku jsem p\u0159ipojil na odd\u011blovac\u00ed transform\u00e1tor a osciloskopem zm\u011b\u0159il pr\u016fb\u011bh nap\u011bt\u00ed na kondenz\u00e1toru 220\u03bcF.<\/p>\n

\"\"<\/a>Kmito\u010det je 27kHz, citlivost osciloskopu je 1V\/d\u00edlek, tak\u017ee na nap\u00e1jec\u00edm nap\u011bt\u00ed jsou impulsy s nap\u011bt\u00edm cca 3V, to nen\u00ed dobr\u00e9 pro nap\u00e1jen\u00ed mikroprocesoru. Projistotu jsem vym\u011bnil v\u0161echny filtra\u010dn\u00ed kondenz\u00e1tory:<\/p>\n

\"\"<\/a>Kapacita kondenz\u00e1toru 220\u03bcF klesla na 190\u03bcF a vnit\u0159n\u00ed odpor je 4,2\u03a9. U nov\u00e9ho kondenz\u00e1toru je vnit\u0159n\u00ed odpor v \u0159\u00e1du desetin ohmu.\"\"<\/a>Sp\u00ednan\u00fd zdroj se te\u010f rozb\u011bhne, ale jenom na chvilku. Potom se p\u0159esyt\u00ed feritov\u00e9 j\u00e1dro transform\u00e1toru, \u0159\u00edd\u00edc\u00ed obvod zdroje nam\u011b\u0159\u00ed v\u011bt\u0161\u00ed proud a p\u0159estane budit v\u00fdkonov\u00fd tranzistor. Tak\u017ee dal\u0161\u00ed chyba bude v obvodu ochrany v\u00fdkonov\u00e9ho tranzistoru. Jeden ze dvou rezistor\u016f 27k\u03a9 m\u00e1 nekone\u010dn\u00fd odpor. Vym\u011bnil jsem ho a deska se rozb\u011bhla.<\/p>\n

Tyto pokusy jsou prov\u00e1d\u011bny s t\u00edm, \u017ee deska je p\u0159ipojena na odd\u011blovac\u00ed transform\u00e1tor a pro sn\u00ed\u017een\u00ed maxim\u00e1ln\u00edho odeb\u00edran\u00e9ho proudu je do s\u00e9rie s deskou v\u0159azen v\u00fdkonov\u00fd odpor 600\u03a9. P\u0159i p\u0159ipojen\u00ed desky na s\u00ed\u0165ov\u00e9 nap\u00e1jen\u00ed m\u016f\u017ee doj\u00edt k \u00farazu, nebo po\u0161kozen\u00ed polovodi\u010d\u016f zdroje.<\/strong><\/span><\/p>\n

Pracovn\u00ed kmito\u010det induk\u010dn\u00ed varn\u00e9 desky<\/h3>\n

R\u00e1d bych v\u011bd\u011bl, na jak\u00e9m kmito\u010dtu induk\u010dn\u00ed varn\u00e1 deska pracuje, proto jsem kolem hrnce polo\u017eil dva z\u00e1vity m\u011bd\u011bn\u00e9ho dr\u00e1tu a p\u0159ipojil je na osciloskop:<\/p>\n

\"\"<\/a>V\u00fdkon desky jsem nastavil na prvn\u00ed stupe\u0148, tak\u017ee elektronika pou\u0161t\u00ed do c\u00edvky kr\u00e1tk\u00e9 impulsy sign\u00e1lu s kmito\u010dtem 27kHz:<\/p>\n

\"\"<\/a>Na dvou z\u00e1vitech polo\u017een\u00fdch kolem hrnce je nap\u011bt\u00ed 6,3V. Kdy\u017e je v\u00fdkon desky nastaven na maximum, deska sn\u00ed\u017e\u00ed pracovn\u00ed kmito\u010det na 20kHz a nap\u011bt\u00ed na z\u00e1vitech kolem hrnce se zvedne na 8V. Z nam\u011b\u0159en\u00e9ho pr\u016fb\u011bhu a pomalu klesaj\u00edc\u00edho nap\u011bt\u00ed na jednotliv\u00fdch p\u016flvln\u00e1ch je vid\u011bt, \u017ee obvod pot\u0159ebuje n\u011bjakou energii a \u010das pro p\u0159emagnetov\u00e1n\u00ed z jedn\u00e9 polarity do druh\u00e9. Proto bylo nutn\u00e9 sn\u00ed\u017eit kmito\u010det.<\/p>\n

\"\"<\/a>V\u011bt\u0161\u00ed plot\u00fdnka se stejn\u00fdm hrncem a kr\u00e1tk\u00fdmi impulsy p\u0159i nejmen\u0161\u00edm v\u00fdkonu zvl\u00e1dne p\u0159emagnetov\u00e1n\u00ed rychleji, tak\u017ee si m\u016f\u017ee dovolit kmito\u010det 36kHz.<\/p>\n

\"\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

V minul\u00e9m \u010dl\u00e1nku jsem se zab\u00fdval principem funkce induk\u010dn\u00ed varn\u00e9 desky a v\u00fdm\u011bnou vadn\u00fdch IGBT modul\u016f. Dnes se zam\u011b\u0159\u00edm na p\u0159\u00ed\u010diny chyby F5 a m\u011b\u0159en\u00ed pracovn\u00edho kmito\u010dtu desky.<\/p>\n","protected":false},"author":1,"featured_media":1131,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[170],"tags":[161],"class_list":["post-1125","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-indukcni-desky","tag-indukcni-deska"],"yoast_head":"\nInduk\u010dn\u00ed varn\u00e1 deska - oprava 2.d\u00edl - Franti\u0161ek Posp\u00ed\u0161il<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ok2jnj.ok2kld.cz\/ok2jnj\/cs\/2019\/02\/indukcni-varna-deska-oprava-2-dil\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Induk\u010dn\u00ed varn\u00e1 deska - oprava 2.d\u00edl - Franti\u0161ek Posp\u00ed\u0161il\" \/>\n<meta property=\"og:description\" content=\"V minul\u00e9m \u010dl\u00e1nku jsem se zab\u00fdval principem funkce induk\u010dn\u00ed varn\u00e9 desky a v\u00fdm\u011bnou vadn\u00fdch IGBT modul\u016f. 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