{"id":705,"date":"2012-05-29T15:32:58","date_gmt":"2012-05-29T13:32:58","guid":{"rendered":"http:\/\/www.dainile.lt\/?p=705"},"modified":"2015-11-03T13:55:36","modified_gmt":"2015-11-03T11:55:36","slug":"12v-i-5v-usb-adapteriukas-is-kinijos","status":"publish","type":"post","link":"https:\/\/www.dclabs.lt\/dainiaus\/12v-i-5v-usb-adapteriukas-is-kinijos\/","title":{"rendered":"12V \u012f 5V USB adapteriukas i\u0161 Kinijos"},"content":{"rendered":"

Jei konkre\u010diai tai kalba eina apie \u0161it\u0105:<\/p>\n

http:\/\/dx.com\/p\/universal-2000ma-usb-car-charger-adapter-for-digital-devices-black-12-24v-72961\u00a0<\/a><\/p>\n

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

Paprastas, ma\u017eiukas, patogus. O ir parametrai \u012fsp\u016bdingi:<\/p>\n

– Color: Black
\n– Ultra-mini size USB car charger
\n– Plugs into your car’s cigarette lighter jack to become a powered USB port
\n– Input: 12~24V
\n– USB power port
\n– Output: 5V \/ 2000mA
\n– Built-in circuit protection, over heat, over loaded protection
\n– Compatible with digital devices with 5V \/ 2000mA input<\/p>\n

\u012edomu, ar viskas \u010dia yra taip kaip para\u0161yta :), patikrinsim. OK, kad juodas ir kad ma\u017eas ir taip ai\u0161ku, kad jungiasi \u012f \u00a0ma\u0161inos 12V lizd\u0105 niekas nesigin\u010dija. Nuo 12V ir 24V dirba. Ilgai nelaikiau, kokia 20 sekund\u017ei\u0173, bet nesusvilo i\u0161karto tai laikys ir ilgiau. Jei nebus jam per kar\u0161ta. Kintant nuo 12V iki 24V i\u0161\u0117jimas apie 5V, apkrov\u0105 u\u017ekabinau kuri valgo 1,0A. Nieko blatno – nichromo vielik\u0117. Kad USB power port tai turbut ir taip ai\u0161ku. Ir USB ir power. Tep, daba apie i\u0161\u0117jim\u0105. Prad\u017eiai 12V \u012f\u0117jime be apkrovos:<\/p>\n

\"\"<\/a>Ir k\u0105 mes \u010dia matom… \u012etampa tai nestabili, kinta nuo 5,28V iki 5,6V. Nieko gero… O vat \u010dia vaizdelis su min\u0117ta apkrova @ 1A:<\/p>\n

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

Dar blogiau… Apkrova valgo tik pus\u0119 deklaruojamos srov\u0117s o \u012f\u0117jime turim belekok\u012f bardak\u0105 ir tik 2,72V-3,04V.<\/p>\n

Tas pats bandymas su 24V \u012f\u0117jimu:<\/p>\n

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


\n<\/a><\/p>\n

Vaizdas dar blogesnis – ant tu\u0161\u010dio 4,72V-6,08V, su apkrova 2,88V-3,28V. Taigi, i\u0161 t\u0173 deklaruojam\u0173 dviej\u0173 Amperiuk\u0173 net pus\u0119 nedalyvauja susirinkime…<\/p>\n

Ok, dabar bi\u0161k\u012f teorijos.<\/p>\n

Schemos pagrindas – CX8505 a\u0161tuonkojis. Tipin\u0117 jungimo schema:<\/p>\n

\"\"<\/a>I\u0161\u0117jimo \u012ftampa nustatoma dalikliu, paskai\u010diuojama Vout = 0,925 \u00b7 (1 + R1\/R2). O toliau \u010dia daug ma\u017e paprastas Buck tipo konverteris…<\/p>\n

Koj\u0173 „raspinovk\u0117”:<\/p>\n

1 – BS – MOSFETo papildomas\/pagalbinis maitinimo kondensatorius. Kondensatorius jungiamas tarp BS ir SW kontakt\u0173 laiko papildom\u0105 kr\u016bv\u012f auk\u0161tos pus\u0117s MOSFETui ir pa\u0161eria j\u012f kai MOSFETas \u012fjungiamas. \u012eprastai naudojami nuo 100nF iki 1uF kondensatoriai.
\n2 – IN – \u012f\u0117jimas, nuo 4,75V iki 18V.
\n3 – SW – impulseko i\u0161\u0117jimas \u012f LC kont\u016br\u0105.
\n4 – GND – GND \ud83d\ude00
\n5 – FB – gr\u012f\u017etamasis ry\u0161ys (feedback). Daliklis turi b\u016bti paskai\u010diuotas taip, kad koja gaut\u0173 0,925V.
\n6 – COMP – kompensacin\u0117 dalis. Nuosekliai sujungta RC > GND grandin\u0117 naudojama kompensuoti valdym\u0105 esant closed-loop schemai.
\n7 – EN – \u012fjungimas. Prijungtas prie auk\u0161to lygio \u012fjungia konverter\u012f. Pajungus per 100K pull-up’\u0105 – automatinis \u012fjungimas.
\n8 – SS – l\u0117to paleidimo kontaktas. Pajungus kondensatori\u0173 tarp SS ir GND nustatomas soft starto laikas. 0,1uF kondensatorius duoda apie 15 mS u\u017elaikym\u0105. Jei funkcija nenaudojama kontakt\u0105 galima palikti neprijungt\u0105.<\/p>\n

Deklaruojami 3 A i\u0161\u0117jime tik\u0117tini, bet reikia nepamir\u0161ti storesni\u0173 laid\u0173. Kadangi \u010dia visgi yra impulsinis maitinimo \u0161altinis i\u0161\u0117jimas tur\u0117t\u0173 b\u016bti stabilesnis. Kaip tur\u0117ti gra\u017eesn\u012f rezultat\u0105 i\u0161\u0117jime ? Nu… Bandom. Pirmas dalykas – i\u0161\u0117jimo kondensatoriaus talpa yra ma\u017eoka (100 uF x 16V), priklijuojam papildomai D dyd\u017eio tantaliuka (470uF x 6V).<\/p>\n

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

\u0160tai ir viskas, papildomas kondensatorius priklijuotas su termoklijais, u\u017edarytas dangtelis ir bandymas be apkrovos…<\/p>\n

\"\"<\/a>
\n… ir jau su apkrova, srov\u0117 2,4A (de\u0161in\u0117je).<\/p>\n

Ar matosi skirtumas \ud83d\ude42 ? Va, dabar jau galima sakyti, kad impulsekas veikia. Beje, pamir\u0161au pamin\u0117ti tai, kas ir taip akivaizdu – i\u0161\u0117jimas \u017eymiai stabilesnis, rei\u0161kia ir maitinamai aprat\u016brai bus ramiau. \u012etampa ai\u0161ku pakrenta prie tokios apkrovos, tai gali b\u016bti ir d\u0117l mano naudoto laido – plonas ir pusmetrinis, o matavau jo gale… N\u0105, sveika b\u016bt\u0173 ir droseliuk\u0105 papimpinti \ud83d\ude42<\/p>\n","protected":false},"excerpt":{"rendered":"

Jei konkre\u010diai tai kalba eina apie \u0161it\u0105: http:\/\/dx.com\/p\/universal-2000ma-usb-car-charger-adapter-for-digital-devices-black-12-24v-72961\u00a0 Paprastas, ma\u017eiukas, patogus. O ir parametrai \u012fsp\u016bdingi: – Color: Black – Ultra-mini size USB car charger – Plugs into your car’s cigarette lighter jack to become a powered USB port – Input: 12~24V – USB power port – Output: 5V \/ 2000mA – Built-in circuit protection, over…<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-705","post","type-post","status-publish","format-standard","hentry","category-elektronika"],"_links":{"self":[{"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/posts\/705","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/comments?post=705"}],"version-history":[{"count":28,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/posts\/705\/revisions"}],"predecessor-version":[{"id":1959,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/posts\/705\/revisions\/1959"}],"wp:attachment":[{"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/media?parent=705"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/categories?post=705"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/tags?post=705"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}