{"id":902,"date":"2016-06-13T05:44:34","date_gmt":"2016-06-13T04:44:34","guid":{"rendered":"http:\/\/ok2jnj.ok2kld.cz\/ok2jnj\/?p=902"},"modified":"2016-08-16T05:40:52","modified_gmt":"2016-08-16T04:40:52","slug":"laboratorni-zdroj-12-cena-soucastek","status":"publish","type":"post","link":"https:\/\/ok2jnj.ok2kld.cz\/ok2jnj\/cs\/2016\/06\/laboratorni-zdroj-12-cena-soucastek\/","title":{"rendered":"Laboratorn\u00ed zdroj – 12. Cena sou\u010d\u00e1stek"},"content":{"rendered":"

Seri\u00e1l \u010dl\u00e1nk\u016f o stavb\u011b laboratorn\u00edho zdroje se bl\u00ed\u017e\u00ed ke konci. Jsou nakoupeny v\u0161echny sou\u010d\u00e1stky, zdroj funguje a my dokon\u010dujeme mont\u00e1\u017e. V tomto \u010dl\u00e1nku se budu zab\u00fdvat cenou jednotliv\u00fdch komponent.<\/p>\n

\"laboratorn\u00ed<\/a><\/p>\n

O stavb\u011b laboratorn\u00edho zdroje \u0159\u00edzen\u00e9ho procesorem, jsme s Michalem OK2HAZ za\u010dali uva\u017eovat n\u011bkdy v roce 2013. Rozhodli jsme se, \u017ee budeme postupn\u011b zkou\u0161et a o\u017eivovat nap\u0159ed analogovou \u010d\u00e1st, \u0159\u00edzenou procesorem ATmega16. Po jej\u00edm doko\u010den\u00ed budeme stav\u011bt a programovat \u0159\u00edd\u00edc\u00ed desku s displejem, rota\u010dn\u00edm kod\u00e9rem a tla\u010d\u00edtky. Nakonec to d\u00e1me cel\u00e9 do sk\u0159\u00ed\u0148ky. Tehdy jsme nem\u011bli stanoven\u00fd \u017e\u00e1dn\u00fd term\u00edn dokon\u010den\u00ed, ani cenov\u00fd limit.<\/p>\n

N\u00e1\u0161 laboratorn\u00ed zdroj je amat\u00e9rskou konstrukc\u00ed, cht\u011bli jsme z\u00edskat zku\u0161enosti s pou\u017e\u00edv\u00e1n\u00edm 16-ti bitov\u00fdch AD a DA p\u0159evodn\u00edk\u016f, sestaven\u00edm a programov\u00e1n\u00edm cel\u00e9ho za\u0159\u00edzen\u00ed. Stavbu zdroje je nutn\u00e9 za\u0159adit mezi rodinn\u00e9 a pracovn\u00ed povinnosti, tak\u017ee od prvn\u00edch pokus\u016f na univerz\u00e1ln\u00ed desce jsme se k hotov\u00e9mu zdroji dostali za t\u0159i roky. Do t\u0159\u00ed let jsou tak\u00e9 rozlo\u017eeny n\u00e1kupy jednotliv\u00fdch v\u011bc\u00ed, celkov\u00e1 suma je kolem 15 tis\u00edc korun. Nakonec se uk\u00e1zalo, \u017ee naj\u00edt kousek voln\u00e9ho \u010dasu je mnohem slo\u017eit\u011bj\u0161\u00ed, ne\u017e uspo\u0159it p\u011btistovku m\u011bs\u00ed\u010dn\u011b, aby bylo na pr\u016fb\u011b\u017en\u00fd n\u00e1kup sou\u010d\u00e1stek.<\/p>\n

Analogov\u00e1 \u010d\u00e1st zdroje<\/h2>\n

\"analogov\u00e1<\/a><\/p>\n

\u00a0\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
Popis sou\u010d\u00e1stky<\/th>Ozna\u010den\u00ed<\/th>Cena<\/th>\n<\/tr>\n<\/thead>\n
3x opera\u010dn\u00ed zesilova\u010d<\/td>OPA228<\/td>312K\u010d<\/td>\n<\/tr>\n
1x referen\u010dn\u00ed zdroj<\/td>REF5025<\/td>100K\u010d<\/td>\n<\/tr>\n
1x \u010dty\u0159kan\u00e1lov\u00fd AD p\u0159evodn\u00edk<\/td>ADS8343<\/td>309K\u010d<\/td>\n<\/tr>\n
1x dvoukan\u00e1lov\u00fd DA p\u0159evodn\u00edk<\/td>DAC8563<\/td>250K\u010d<\/td>\n<\/tr>\n
2x opera\u010dn\u00ed zesilova\u010d<\/td>OPA365<\/td>130K\u010d<\/td>\n<\/tr>\n
1x mikroprocesor<\/td>ATmega16<\/td>40K\u010d<\/td>\n<\/tr>\n
2x filtra\u010dn\u00ed kondenz\u00e1tor<\/td>10mF<\/td>200K\u010d<\/td>\n<\/tr>\n
2x rel\u00e9<\/td>RELEF4052<\/td>132K\u010d<\/td>\n<\/tr>\n
4x v\u00fdkonov\u00fd tranzistor<\/td>TIP35<\/td>140K\u010d<\/td>\n<\/tr>\n
pasivn\u00ed sou\u010d\u00e1stky a drobn\u00e9 polovodi\u010de<\/td><\/td>300K\u010d<\/td>\n<\/tr>\n
Plo\u0161n\u00fd spoj<\/td><\/td>1000K\u010d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/p>\n

Celkov\u00e1 cena osazen\u00e9 desky je p\u0159ibli\u017en\u011b 2900K\u010d. Desky pot\u0159ebujeme dv\u011b, tak\u017ee jsme skoro na 6000K\u010d.<\/p>\n

A co by se dalo zm\u011bnit, nebo u\u0161et\u0159it?<\/h3>\n

S n\u00e1mi navr\u017een\u00fdm zapojen\u00edm, s 16-ti bitov\u00fdmi p\u0159evodn\u00edky a oboustrannou, profesion\u00e1ln\u011b vyrobenou deskou je mo\u017eno dos\u00e1hnout rozli\u0161en\u00ed 1mV a 0,1mA. To je pro d\u00edlenskou praxi zbyte\u010dn\u00e9. My cht\u011bli z\u00edskat zku\u0161enosti p\u0159i n\u00e1vrhu a programov\u00e1n\u00ed za\u0159\u00edzen\u00ed s AD a DA p\u0159evodn\u00edky, proto jsme to s rozli\u0161en\u00edm a t\u00edm i cenou polovodi\u010d\u016f p\u0159ehnali. Ani jsme ne\u010dekali, \u017ee budou parametry tak dobr\u00e9. Hlavn\u011b p\u0159i m\u011b\u0159en\u00ed proudu jsme o\u010dek\u00e1vali, \u017ee obvod s bo\u010dn\u00edkem 0,02\u03a9 bude zat\u00ed\u017een \u0161umem a rozli\u0161en\u00ed bude mnohem men\u0161\u00ed.<\/p>\n

D\u00e1 se p\u0159edpok\u00e1dat, \u017ee p\u0159i pou\u017eit\u00ed 10-ti bitov\u00fdch p\u0159evodn\u00edk\u016f v DIP pouzdru, nebo p\u0159evodn\u00edk\u016f integrovan\u00fdch v procesoru, bude rozli\u0161en\u00ed 0,1V. P\u0159itom bude sta\u010dit v dom\u00e1c\u00edch podm\u00ednk\u00e1ch vyroben\u00fd plo\u0161n\u00fd spoj a opera\u010dn\u00ed zesilova\u010de nap\u0159. OP07. Kritickou \u010d\u00e1st\u00ed desky z\u016fstane obvod pro m\u011b\u0159en\u00ed proudu na bo\u010dn\u00edku, ten mus\u00ed b\u00fdt v proveden\u00ed SMD. Celkov\u00e1 cena osazen\u00e9 desky by potom mohla b\u00fdt polovi\u010dn\u00ed.<\/p>\n

\u0158\u00edd\u00edc\u00ed deska zdroje<\/h2>\n

\"ATXmega128\"<\/a>\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
1x sp\u00ednan\u00fd regul\u00e1tor<\/th>LT3508<\/th>180K\u010d<\/th>\n<\/tr>\n<\/thead>\n
1x procesor<\/td>ATXmega128A1AU<\/td>140K\u010d<\/td>\n<\/tr>\n
1x displej<\/td>4,3\" TFT<\/td>450K\u010d<\/td>\n<\/tr>\n
1x hodinov\u00fd obvod<\/td>DS3231<\/td>110K\u010d<\/td>\n<\/tr>\n
Drobn\u00e9 polovodi\u010de a pasivn\u00ed sou\u010d\u00e1stky<\/td><\/td>260K\u010d<\/td>\n<\/tr>\n
Deska plo\u0161n\u00e9ho spoje<\/td><\/td>800K\u010d<\/td>\n<\/tr>\n
Optick\u00fd rota\u010dn\u00ed kod\u00e9r<\/td><\/td>350K\u010d<\/td>\n<\/tr>\n
<\/td><\/td><\/td>\n<\/tr>\n
<\/td><\/td><\/td>\n<\/tr>\n
<\/td><\/td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/p>\n

Cena osazen\u00e9 desky je 2300K\u010d. P\u0159itom desky plo\u0161n\u00fdch spoj\u016f byly objedn\u00e1ny \u010dty\u0159i. Po dokon\u010den\u00ed n\u00e1vrhu Michal vygeneroval data Gerber, kter\u00e9 p\u0159edal do firmy Printed s.r.o.<\/a><\/span> Za p\u0159\u00edpravu dat jsme zaplatili 1000K\u010d, za ka\u017edou desku v\u010detn\u011b jednostrann\u00e9ho potisku a zlacen\u00ed 550K\u010d.<\/p>\n

Tady jsme utratili hodn\u011b pen\u011bz s t\u00edm, \u017ee druhou desku pou\u017eijeme v budoucnosti, p\u0159i \u0159\u00edzen\u00ed vyt\u00e1p\u011bn\u00ed rodinn\u00e9ho domu. Proto jsou osazeny pro laboratorn\u00ed zdroj zbyte\u010dn\u00e9 obvody. Step-down m\u011bni\u010d se zbyte\u010dn\u011b velk\u00fdm rozsahem vstupn\u00edho nap\u011bt\u00ed, hodinov\u00fd obvod, s\u00e9riov\u00e1 linka RS485.<\/p>\n

Mo\u017en\u00e9 \u00faspory u \u0159\u00edd\u00edc\u00ed desky<\/h3>\n

Analogov\u00e9 desky komunikuj\u00ed po galvanicky odd\u011blen\u00e9 s\u00e9riov\u00e9 lince. Tak\u017ee k \u0159\u00edzen\u00ed zdroje lze pou\u017e\u00edt v\u0161echno, co m\u00e1 procesor s integrovan\u00fdm kan\u00e1lem UART a displej. Prvn\u00ed pokusy jsem d\u011blal s pou\u017eit\u00edm \u0161upl\u00edkov\u00fdch z\u00e1sob. Procesor ATmega162 na univerz\u00e1ln\u00ed desce a alfanumerick\u00fd displej vymontovan\u00fd u\u017e ani nev\u00edm z \u010deho.<\/p>\n

\"ATmega162\"<\/a>A\u017e pozd\u011bji jsme p\u0159i\u0161li na to, \u017ee bychom cht\u011bli barevn\u00fd displej. No a tady se uk\u00e1zalo, \u017ee TFT displeje pot\u0159ebuj\u00ed spoustu dat a jestli m\u00e1 b\u00fdt obnovov\u00e1n\u00ed \u00fadaj\u016f na displeji dosti rychl\u00e9, nebude ATmega sta\u010dit. Tak jsme zvolili ATxmega128 a t\u00edm vznikla pot\u0159eba m\u00edt profesion\u00e1ln\u011b vyrobenou desku, abychom mohli osadit procesor v pouzdru TQFP100.<\/p>\n

Ostatn\u00ed komponenty<\/h2>\n

Michal m\u00e1 toroidn\u00ed transform\u00e1tor vyroben\u00fd na zak\u00e1zku s p\u0159\u00edkonem 600VA za 2600K\u010d. J\u00e1 jsem pou\u017eil dva transform\u00e1tory po 300VA, koupen\u00e9 n\u011bkde na burze za p\u00e1r set korun s t\u00edm, \u017ee vinut\u00ed pro nap\u00e1jen\u00ed opera\u010dn\u00edch zesilova\u010d\u016f jsem namotal ru\u010dn\u011b.<\/p>\n

Hlin\u00edkov\u00e1 sk\u0159\u00ed\u0148 19″ st\u00e1la 2400K\u010d.<\/p>\n

Zd\u00ed\u0159ky, konektory, kabely, ventil\u00e1tor, chladi\u010d a mal\u00fd transform\u00e1tor pro nap\u00e1jen\u00ed \u0159\u00edd\u00edc\u00ed desky… 2000K\u010d, kdy\u017e by se v\u0161echno kupovalo nov\u00e9.<\/p>\n

Z\u00e1v\u011br<\/h2>\n

V \u010dl\u00e1nku jsem cht\u011bl uk\u00e1zat, \u017ee celkov\u00e1 cena sou\u010d\u00e1stek rozpo\u010d\u00edtan\u00e1 na stovky hodin n\u00e1vrhu plo\u0161n\u00fdch spoj\u016f, o\u017eivov\u00e1n\u00ed, hledn\u00e1n\u00ed chyb a programov\u00e1n\u00ed, nen\u00ed zas tak velk\u00e1. Bude to mo\u017en\u00e1 20K\u010d na hodinu z\u00e1bavy ve voln\u00e9m \u010dase? P\u0159itom to, co jsem popsal, je maxim\u00e1ln\u00ed \u010d\u00e1stka za zbyte\u010dn\u011b velk\u00e9 rozli\u0161en\u00ed m\u011b\u0159idel.<\/p>\n

Je tu spousta levn\u011bj\u0161\u00edch variant, jak postavit zdroj, kter\u00fd je analogov\u00fd, regula\u010dn\u00ed smy\u010dky jsou sestaveny z opera\u010dn\u00edch zesilova\u010d\u016f a p\u0159itom je \u0159\u00edzen\u00fd procesorem.<\/p>\n","protected":false},"excerpt":{"rendered":"

Cena sou\u010d\u00e1stek pro laboratorn\u00ed zdroj, mo\u017enosti \u00faspor a jejich vliv na v\u00fdsledn\u00e9 parametry.<\/p>\n","protected":false},"author":1,"featured_media":903,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[136,137,116,135,151],"class_list":["post-902","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laboratorni-zdroj","tag-atmel","tag-homemade-power-supply","tag-laboratorni-zdroj","tag-laboratory-power-supply","tag-laborstromversorgung-schema"],"yoast_head":"\nLaboratorn\u00ed zdroj - 12. 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