{"id":1242,"date":"2019-12-28T18:20:39","date_gmt":"2019-12-28T17:20:39","guid":{"rendered":"http:\/\/ok2jnj.ok2kld.cz\/ok2jnj\/?p=1242"},"modified":"2021-12-29T11:45:33","modified_gmt":"2021-12-29T10:45:33","slug":"oprava-frekvencniho-menice-invertek-optidrive-e3","status":"publish","type":"post","link":"https:\/\/ok2jnj.ok2kld.cz\/ok2jnj\/cs\/2019\/12\/oprava-frekvencniho-menice-invertek-optidrive-e3\/","title":{"rendered":"Oprava frekven\u010dn\u00edho m\u011bni\u010de Invertek Optidrive E3"},"content":{"rendered":"\n

Dostal jsem frekven\u010dn\u00ed m\u011bni\u010d s t\u00edm, \u017ee je sp\u00e1len\u00fd. Sou\u010d\u00e1stky by se mohly hodit, ale proto\u017ee jsou v\u00e1noce, m\u00e1m dost \u010dasu na prozkoum\u00e1n\u00ed zapojen\u00ed. Pod\u00edv\u00e1m se, jestli bych m\u011bni\u010d neum\u011bl opravit i kdy\u017e jedin\u00e9 vyu\u017eit\u00ed bude plynul\u00fd rozjezd cirkul\u00e1rky. <\/p>\n\n\n\n

V\u00fdkonov\u00e9 prvky, usm\u011br\u0148ova\u010d, blok IGBT modul\u016f a tranzistor 2SK2225<\/a> u\u017e n\u011bkdo m\u011bnil, tak budou asi v po\u0159\u00e1dku. Sch\u00e9ma zapojen\u00ed m\u011bni\u010de nen\u00ed dostupn\u00e9, tak zkus\u00edm jeho \u010d\u00e1st na\u010drtnout podle plo\u0161n\u00fdch spoj\u016f, abych se v tom trochu vyznal.<\/p>\n\n\n\n

Desky plo\u0161n\u00fdch spoj\u016f<\/h3>\n\n\n\n

1. Deska UNI POWER FILTER obsahuje tlumivku, odru\u0161ovac\u00ed a filtra\u010dn\u00ed kondenz\u00e1tory. Skupina \u0161esti paraleln\u011b zapojen\u00fdch odpor\u016f je v s\u00e9rii s usm\u011br\u0148ova\u010dem a nab\u00edj\u00ed se p\u0159es n\u011b kondenz\u00e1tory. Rel\u00e9 G8P-1A4P potom odpory p\u0159emost\u00ed. <\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

2. Deska s displejem, tla\u010d\u00edtky a obvody, kter\u00e9 se staraj\u00ed o komunikaci m\u011bni\u010de s okol\u00edm. <\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

3. Deska se zdrojem, \u0159\u00edd\u00edc\u00ed elektronikou a v\u00fdkonov\u00fdmi polovodi\u010di je na\u0161roubovan\u00e1 na masivn\u00ed hlin\u00edkov\u00fd chladi\u010d. Sedm IGBT tranzistor\u016f je integrov\u00e1no do v\u00fdkonov\u00e9ho modulu 7MBP75TEA120 <\/a><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Sp\u00ednan\u00fd zdroj je \u0159\u00edzen obvodem UC3844<\/a>. Na jeho vstup se p\u0159es usm\u011br\u0148ova\u010d dostane stejnosm\u011brn\u00e9 nap\u011bt\u00ed, ale na v\u00fdstupu zdroje u\u017e nic nen\u00ed. Budu se tedy zab\u00fdvat sp\u00ednan\u00fdm zdrojem. Sp\u00e1len\u00fd by mohl b\u00fdt integrovan\u00fd obvod, nebo n\u011bco kolem n\u011bj. <\/p>\n\n\n\n

\u00dakoly m\u011bni\u010de s obvodem UC3844<\/h3>\n\n\n\n

1. Dokud na nap\u00e1jec\u00edm pinu 7 nen\u00ed alespo\u0148 16V, m\u00e1 obvod minim\u00e1ln\u00ed spot\u0159ebu a nic ned\u011bl\u00e1. Po p\u0159ekro\u010den\u00ed 16V obvod za\u010dne pracovat a na v\u00fdstupu generovat obd\u00e9ln\u00edkov\u00fd sign\u00e1l, kter\u00fdm se ovl\u00e1d\u00e1 v\u00fdkonov\u00fd tranzistor. Tak\u017ee jsem p\u0159ipojil extern\u00ed nap\u00e1jen\u00ed a po dosa\u017een\u00ed 16,5V se obvod rozb\u011bhl. Na pinu 8 je referen\u010dn\u00ed nap\u011bt\u00ed 5V a na pinu 6 je kmito\u010det 50kHz, kter\u00fdm je ovl\u00e1d\u00e1n MOSFET 2SK2225. Pro\u010d tam dali tranzistor v pouzdru TO-3, nesta\u010dil by n\u011bjak\u00fd men\u0161\u00ed? V\u017edy\u0165 ten zdroj bude m\u00edt v\u00fdkon p\u00e1r watt. Jo on m\u00e1 max. nap\u011bt\u00ed 1500V, tak takov\u00e9 tranzistory se asi v TO-220 nevyr\u00e1b\u00ed.<\/p>\n\n\n\n

2. Pin 2 je vstup opera\u010dn\u00edho zesilova\u010de, kompar\u00e1toru, kter\u00fd je ur\u010den pro sledov\u00e1n\u00ed v\u00fdstupn\u00edho nap\u011bt\u00ed a regulaci \u0161\u00ed\u0159ky v\u00fdstupn\u00edho pulsu. Sledovan\u00e9 nap\u011bt\u00ed je p\u0159ivedeno p\u0159es odporov\u00fd d\u011bli\u010d 10k \/ 9k7 a porovn\u00e1v\u00e1no s vnit\u0159n\u00edm referen\u010dn\u00edm nap\u011bt\u00edm 2,5V. Tak\u017ee se o\u010dek\u00e1v\u00e1, \u017ee nap\u011bt\u00ed bude 5V. P\u0159ivedl jsem regulovateln\u00e9 nap\u011bt\u00ed a ov\u011b\u0159il, \u017ee p\u0159i 5,11V se kmito\u010det 50kHz na v\u00fdstupu odpoj\u00ed. To znamen\u00e1, \u017ee nap\u011b\u0165ov\u00e1 regulace funguje dob\u0159e.<\/p>\n\n\n\n

3. Pin 3 je vstup druh\u00e9ho kompar\u00e1toru. Ten je ur\u010den pro sledov\u00e1n\u00ed proudu, kter\u00fd te\u010de prim\u00e1rn\u00edm vinut\u00edm transform\u00e1toru. Nap\u011bt\u00ed na tomto vstupu je porovn\u00e1v\u00e1no s vnit\u0159n\u00ed referenc\u00ed 1V. Vstup je p\u0159ipojen na dvojici paraleln\u011b zapojen\u00fdch SMD odpor\u016f 6R8. P\u0159ipojil jsem regulovateln\u00e9 nap\u011bt\u00ed z laboratorn\u00edho zdroje, pomalu jej zvy\u0161oval a o\u010dek\u00e1val odb\u011br v des\u00edtk\u00e1ch mA u\u017e p\u0159i p\u00e1r desetin\u00e1ch voltu. Ale odb\u011br nen\u00ed \u017e\u00e1dn\u00fd, odpory jsou sp\u00e1len\u00e9. Tak\u017ee prvn\u00ed chyba je objevena. Ale obvod UC3844 po dosa\u017een\u00ed 1,1V na pinu 3 odpoj\u00ed v\u00fdstupn\u00ed kmito\u010det 50kHz, tohle je v po\u0159\u00e1dku. \u017d\u00e1dn\u00e1 \u010d\u00e1st \u0159\u00edd\u00edc\u00edho obvodu nen\u00ed po\u0161kozen\u00e1.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Odstran\u011bn\u00ed z\u00e1vady<\/h3>\n\n\n\n

Co s t\u011bmi odpory? Kdy\u017e by na nich bylo nap\u011bt\u00ed 1V, co\u017e odpov\u00edd\u00e1 maxim\u00e1ln\u00edmu v\u00fdkonu m\u011bni\u010de, pote\u010de ka\u017ed\u00fdm 147mA. To je 147mW. Odpory jsou v pouzdru 0805, tak\u017ee max. z\u00e1t\u011b\u017e by mohla b\u00fdt 125mW. Proud te\u010de odpory max. 50% \u010dasu, tak\u017ee by to m\u011bly vydr\u017eet, ale nevydr\u017eely. Vym\u011bn\u00edm je a pod\u00edv\u00e1m se, co dal\u0161\u00edho by mohlo b\u00fdt po\u0161kozeno.<\/p>\n\n\n\n

No, SMD rezistory tak mal\u00fdch hodnot nem\u00e1m, budu tam muset d\u00e1t oby\u010dejn\u00fd v\u00fdvodov\u00fd odpor s hodnotou 2R2. To je m\u00ed\u0148, ne\u017e tam bylo, max. proud te\u010f bude 450mA.<\/p>\n\n\n\n

P\u0159i sp\u00edn\u00e1n\u00ed v\u00fdkonov\u00e9ho FET tranzistoru zdroje vznikaj\u00ed na prim\u00e1rn\u00edm vinut\u00ed trafa nap\u011b\u0165ov\u00e9 pulsy, kter\u00e9 je pot\u0159eba n\u011bkde spot\u0159ebovat. Obvykle se k tomu pou\u017e\u00edvaj\u00ed rychl\u00e9 diody a RC \u010dl\u00e1nky. Kondenz\u00e1tory by byly celkem velk\u00e9 a tady \u017e\u00e1dn\u00e9 nejsou. Zato je u prim\u00e1rn\u00edho vinut\u00ed je dvojice n\u011bjak\u00fdch divn\u00fdch diod. BZG 03 C 160, takovou nezn\u00e1m a hlavn\u011b nem\u00e1m. No, ona je to zenerova dioda a zenerovo nap\u011bt\u00ed je 160V. Tak\u017ee kdy\u017e bude puls p\u0159i zav\u00edr\u00e1n\u00ed tranzistoru v\u011bt\u0161\u00ed ne\u017e 320V, do s\u00e9rie zapojen\u00e9 diody se otev\u0159ou a spot\u0159ebuj\u00ed jej.<\/p>\n\n\n\n

Na vstup m\u011bni\u010de jsem p\u0159ipojil usm\u011brn\u011bn\u00fdch 230V z odd\u011blovac\u00edho transform\u00e1toru a ono se nic ned\u011bje. Stejnosm\u011brn\u00e9 nap\u011bt\u00ed pro start obvodu UC3844 je p\u0159iv\u00e1d\u011bno p\u0159es dvojici odpor\u016f 150k a te\u010f je za nimi 12V. Kdy\u017e budu m\u011bni\u010d nap\u00e1jet 400V, tak to asi bude dobr\u00e9, ale te\u010f je pot\u0159eba p\u0159idat p\u00e1r volt\u016f z laboratorn\u00edho zdroje. M\u011bni\u010d se rozb\u011bhl a na jeho displeji se objevilo chybov\u00e9 hl\u00e1\u0161en\u00ed oznamuj\u00edc\u00ed, \u017ee je podp\u011bt\u00ed na stejnosm\u011brn\u00e9m meziobvodu. <\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

Na obr\u00e1zku z osciloskopu je vid\u011bt \u017elut\u00fd paprsek prvn\u00edho kan\u00e1lu, kter\u00fd zobrazuje sp\u00edn\u00e1n\u00ed v\u00fdkonov\u00e9ho tranzistoru. Kmito\u010det je 50kHz, Druh\u00fd kan\u00e1l zobrazuje proud tekouc\u00ed prim\u00e1rn\u00edm vinut\u00edm. Je vid\u011bt, jak po p\u0159ipojen\u00ed nap\u011bt\u00ed na vinut\u00ed proud line\u00e1rn\u011b roste, a\u017e dos\u00e1hne 130mA.<\/p>\n\n\n\n

Feritov\u00fd transform\u00e1tor m\u00e1 n\u011bjak moc sekund\u00e1rn\u00edch vinut\u00ed, je\u0161t\u011b se pod\u00edv\u00e1m, kam v\u0161echny vedou. T\u0159i jsou navz\u00e1jem galvanicky odd\u011blen\u00e9 a nap\u00e1j\u00ed ovl\u00e1d\u00e1n\u00ed t\u0159\u00ed IGBT tranzistor\u016f, kter\u00e9 jsou p\u0159ipojeny na kladn\u00fd p\u00f3l usm\u011br\u0148ova\u010de. Dal\u0161\u00ed vinut\u00ed nap\u00e1j\u00ed t\u0159i IGBT, kter\u00e9 jsou p\u0159ipojeny na z\u00e1porn\u00fd p\u00f3l usm\u011br\u0148ova\u010de. Pak jsou tu je\u0161t\u011b dal\u0161\u00ed galvanicky odd\u011blen\u00e1 vinut\u00ed, kter\u00e9 nap\u00e1j\u00ed malou desku s displejem a sb\u011brnic\u00ed pro \u0159\u00edzen\u00ed.<\/p>\n\n\n\n

Jednotliv\u00e9 obvody jsou navz\u00e1jem odd\u011bleny spoustou opto\u010dlen\u016f, jejich \u010dinnost u\u017e m\u011b nezaj\u00edm\u00e1. M\u011bni\u010d jsem smontoval a vyzkou\u0161el, jak se pomalu rozt\u00e1\u010d\u00ed m\u00edcha\u010dka a cirkul\u00e1rka.<\/p>\n\n\n\n

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

Sch\u00e9ma zapojen\u00ed m\u011bni\u010de nen\u00ed dostupn\u00e9, tak zkus\u00edm jeho \u010d\u00e1st na\u010drtnout podle plo\u0161n\u00fdch spoj\u016f, abych se v tom trochu vyznal. <\/p>\n","protected":false},"author":1,"featured_media":1248,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[168,169],"class_list":["post-1242","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-elektronika","tag-igbt","tag-invertek"],"yoast_head":"\nOprava frekven\u010dn\u00edho m\u011bni\u010de Invertek Optidrive E3 - Franti\u0161ek Posp\u00ed\u0161il<\/title>\n<meta name=\"description\" content=\"Pod\u00edv\u00e1m se, jestli bych m\u011bni\u010d neum\u011bl opravit i kdy\u017e jedin\u00e9 vyu\u017eit\u00ed bude plynul\u00fd rozjezd cirkul\u00e1rky. Sch\u00e9ma zapojen\u00ed m\u011bni\u010de nen\u00ed dostupn\u00e9, tak zkus\u00edm jeho \u010d\u00e1st na\u010drtnout podle plo\u0161n\u00fdch spoj\u016f, abych se v tom trochu vyznal.\" \/>\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\/12\/oprava-frekvencniho-menice-invertek-optidrive-e3\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oprava frekven\u010dn\u00edho m\u011bni\u010de Invertek Optidrive E3 - Franti\u0161ek Posp\u00ed\u0161il\" \/>\n<meta property=\"og:description\" content=\"Pod\u00edv\u00e1m se, jestli bych m\u011bni\u010d neum\u011bl opravit i kdy\u017e jedin\u00e9 vyu\u017eit\u00ed bude plynul\u00fd rozjezd cirkul\u00e1rky. 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