{"id":4826,"date":"2023-01-04T14:54:46","date_gmt":"2023-01-04T12:54:46","guid":{"rendered":"https:\/\/www.dclabs.lt\/dainiaus\/?p=4826"},"modified":"2023-01-04T15:29:32","modified_gmt":"2023-01-04T13:29:32","slug":"paprastas-maitinimo-stabilizavimas","status":"publish","type":"post","link":"https:\/\/www.dclabs.lt\/dainiaus\/paprastas-maitinimo-stabilizavimas\/","title":{"rendered":"Paprastas maitinimo stabilizavimas"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Prisireik\u0117 man \u010dia vienam projektukui stabilizuoti maitinim\u0105, kad i\u0161sikraunant baterijai (9 V) \u012ftampa b\u016bt\u0173 stabili (6-7 V). Vienas papras\u010diausi\u0173 b\u016bt\u0173 t\u0105 padaryti b\u016bt\u0173 DC-DC keitiklio naudojimas ir jau galvojau d\u0117ti jau pam\u0117gtus Mornsun moduliukus, \u0161iuo atveju <a rel=\"noreferrer noopener\" href=\"https:\/\/www.mornsun-power.com\/index\/sitesearch\/partlink\/keyword\/K7812JT-500R3-LB.html\" data-type=\"URL\" data-id=\"https:\/\/www.mornsun-power.com\/index\/sitesearch\/partlink\/keyword\/K7812JT-500R3-LB.html\" target=\"_blank\">K7812JT-500R3-LB<\/a> (6,5 V 500 mA):<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-1.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-1.png\" alt=\"\" class=\"wp-image-4829\" width=\"174\" height=\"128\" srcset=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-1.png 319w, https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-1-300x221.png 300w\" sizes=\"auto, (max-width: 174px) 100vw, 174px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Kainuoja centus, efektyvus, stabilus ir geras. Bet kaip visada, lengviausi sprendimai ne man <img decoding=\"async\" draggable=\"false\" class=\"eedee-emoji\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/12.0.0-1\/svg\/1f60b.svg\" alt=\"\ud83d\ude0b\">, tod\u0117l prisiminiau tok\u012f senovi\u0161k\u0105 \u017eod\u012f <a rel=\"noreferrer noopener\" href=\"https:\/\/lt.wikipedia.org\/wiki\/Stabilitronas\" data-type=\"URL\" data-id=\"https:\/\/lt.wikipedia.org\/wiki\/Stabilitronas\" target=\"_blank\">stabilitronas<\/a>. Dabar tas daiktas vadinamas Zenerio diodu. Nebus jis toks jau stabilus temperat\u016bri\u0161kai, bet \u0161iuo atveju tiks, nes reikia pasikartoti skai\u010diavimo teorij\u0105. Tipin\u0117 schema tokia:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-2.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-2.png\" alt=\"\" class=\"wp-image-4831\" width=\"305\" height=\"193\" srcset=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-2.png 980w, https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-2-300x191.png 300w, https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-2-768x489.png 768w\" sizes=\"auto, (max-width: 305px) 100vw, 305px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Tranzistorius gali b\u016bti prie\u0161ingo poliarumo, tada schema truput\u012f kitokia. Bet schemoje visi tranzistoriai NPN tai tok\u012f naudosiu ir stabilizavimui.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Teorija tokia &#8211; \u0161itoks \u012ftampos reguliatorius, sudarytas i\u0161 bipoliarinio tranzistoriaus, pajungto pagal emiterinio kartotuvo schem\u0105, kur\u012f valdo \u012ftampos daliklis i\u0161 rezistoriaus ir stabilitrono. Daliklio i\u0161\u0117jimas valdo tranzistoriaus baz\u0119, taip valdydamas \u012ftamp\u0105 i\u0161\u0117jime. Principe u\u017etekt\u0173 vien tik stabilitrono, bet su tranzistoriumi gaunama \u017eymiai didesn\u0117 srov\u0117 i\u0161\u0117jime. Svarb\u016bs tranzistoriaus parametrai &#8211; maksimali srov\u0117 ir h<sub>FE<\/sub>. Susi\u017eymime sroves ir j\u0173 kryptis:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-3.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-3.png\" alt=\"\" class=\"wp-image-4834\" width=\"332\" height=\"215\" srcset=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-3.png 999w, https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-3-300x195.png 300w, https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-3-768x499.png 768w\" sizes=\"auto, (max-width: 332px) 100vw, 332px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Schemoje naudojami <a rel=\"noreferrer noopener\" href=\"https:\/\/www.nexperia.com\/products\/bipolar-transistors\/general-purpose-and-low-vcesat-bipolar-transistors\/single-bipolar-transistors\/single-bipolar-transistors-100-v\/MMBT3904.html\" data-type=\"URL\" data-id=\"https:\/\/www.nexperia.com\/products\/bipolar-transistors\/general-purpose-and-low-vcesat-bipolar-transistors\/single-bipolar-transistors\/single-bipolar-transistors-100-v\/MMBT3904.html\" target=\"_blank\">MMBT3904 <\/a>tranzisotriai, 40 V, 200 mA, h<sub>FE<\/sub> nuo 30 iki 300, priklausomai nuo kolektoriaus srov\u0117s.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-4.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-4.png\" alt=\"\" class=\"wp-image-4836\" width=\"248\" height=\"313\" srcset=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-4.png 410w, https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-4-237x300.png 237w\" sizes=\"auto, (max-width: 248px) 100vw, 248px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Pagal kolektoriaus srov\u0119 many\u010diau, kad h<sub>FE<\/sub> bus apie 200, tod\u0117l tok\u012f skai\u010di\u0173 ir naudosiu. Taigi, turime, kad h<sub>FE<\/sub> = 200, maksimali srov\u0117 100 mA (realiai ten kokia 10 mA tereiks), skai\u010diuojame:<\/p>\n\n\n\n<div class=\"wp-block-mathml-mathmlblock\">\\[h_{FE} = {I_{OUT} \\over I_B}\\]<script id=\"wp-hooks-js\" src=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-includes\/js\/dist\/hooks.min.js?ver=f0f188028580e8dc1255\"><\/script>\n<script id=\"wp-i18n-js\" src=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-includes\/js\/dist\/i18n.min.js?ver=1dfe7db3940c23ea9216\"><\/script>\n<script id=\"wp-i18n-js-after\">\nwp.i18n.setLocaleData( { 'text direction\\u0004ltr': [ 'ltr' ] } );\n\/\/# sourceURL=wp-i18n-js-after\n<\/script>\n<script  async id=\"mathjax-js\" src=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/mathjax\/2.7.7\/MathJax.js?config=TeX-MML-AM_CHTML\"><\/script>\n<\/div>\n\n\n\n<div class=\"wp-block-mathml-mathmlblock\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">I\u0161 \u010dia:<\/p>\n\n\n\n<div class=\"wp-block-mathml-mathmlblock\"><\/div>\n\n\n\n<div class=\"wp-block-mathml-mathmlblock\">\\[I_B = {I_{OUT} \\over h_{FE}}\\]<\/div>\n\n\n\n<div class=\"wp-block-mathml-mathmlblock\">\\[I_B = {0,1_A \\over 200}=0,0005_A\\]<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Toliau prisiminkime m\u016bs\u0173 geriausio draugo <a rel=\"noreferrer noopener\" href=\"http:\/\/www.technologijos.lt\/n\/technologijos\/elektronika\/n\/technologijos\/elektronika\/straipsnis\/Kirchofo-desniai?name=straipsnis-2136\" data-type=\"URL\" data-id=\"http:\/\/www.technologijos.lt\/n\/technologijos\/elektronika\/n\/technologijos\/elektronika\/straipsnis\/Kirchofo-desniai?name=straipsnis-2136\" target=\"_blank\">Kirchhofo taisykles<\/a>. Pagal jas, srov\u0117 per R1 bus lygi srov\u0117s per D1 ir baz\u0117s srov\u0117s sumai.<\/p>\n\n\n\n<div class=\"wp-block-mathml-mathmlblock\"><\/div>\n\n\n\n<div class=\"wp-block-mathml-mathmlblock\">\\[I_{R1} = I_B + I_{D1}\\]<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u017di\u016brim pasirinkto stabilitrono <a href=\"https:\/\/www.diodes.com\/assets\/Datasheets\/ds18004.pdf\" data-type=\"URL\" data-id=\"https:\/\/www.diodes.com\/assets\/Datasheets\/ds18004.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">BZT52C6V8-7-F<\/a> dokumentacij\u0105:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-5.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-5-1024x416.png\" alt=\"\" class=\"wp-image-4844\" width=\"658\" height=\"267\" srcset=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-5-1024x416.png 1024w, https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-5-300x122.png 300w, https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-5-768x312.png 768w, https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-5.png 1063w\" sizes=\"auto, (max-width: 658px) 100vw, 658px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">I<sub>ZT<\/sub> = 5 mA, t. y. reikia bent 5 mA (0,005 A), kad diodas b\u016bt\u0173 gr\u016btin\u0117je voltamperin\u0117s charakteristikos zonoje. <\/p>\n\n\n\n<div class=\"wp-block-mathml-mathmlblock\">\\[I_{R1} = 0,0005_A + 0,005_{A_{I_{D1}}}=0,0055_A\\]<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Naudojame 6,8 V stabilitron\u0105, o maitinimas bus nuo 9 V baterijos (Krona arba 6LR61), tai ant rezistoriaus R1 turime nusodinti 9 &#8211; 6,8 = 2,2 V. Kai jau turime srov\u0117 per rezistori\u0173 ir \u012ftamp\u0105, d\u0117d\u0117s Omo d\u0117snio pagalba skai\u010diuojame rezistoriaus var\u017e\u0105:<\/p>\n\n\n\n<div class=\"wp-block-mathml-mathmlblock\"><\/div>\n\n\n\n<div class=\"wp-block-mathml-mathmlblock\">\\[R_{R1} = {U_{R1} \\over I_{R1}}\\]<\/div>\n\n\n\n<div class=\"wp-block-mathml-mathmlblock\">\\[R_{R1} = {2,2_V \\over 0,0055_A}=400 \\Omega\\]<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Jeigu baterija jau pas\u0117dusi ir \u012ftampa pakris, tarkim, iki 8 V, tuomet 8 &#8211; 6,8 = 1,2 V ir:<\/p>\n\n\n\n<div class=\"wp-block-mathml-mathmlblock\">\\[R_{R1} = {1,2_V \\over 0,0055_A}=218,18 \\Omega\u2248220\\Omega\\]<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Taigi, norint, kad schema veikt\u0173 prie 8 V, reik\u0117t\u0173 naudoti 220 \u2126 rezistori\u0173. Prie 9 V tuomet stabilitrono srov\u0117 bus 10 mA.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ir dabar galima atsinaujinti schem\u0105:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-6.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-6.png\" alt=\"\" class=\"wp-image-4851\" width=\"421\" height=\"279\" srcset=\"https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-6.png 978w, https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-6-300x199.png 300w, https:\/\/www.dclabs.lt\/dainiaus\/wp-content\/uploads\/2023\/01\/image-6-768x510.png 768w\" sizes=\"auto, (max-width: 421px) 100vw, 421px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Kondensatorius nelabai reikalingas, bet 1 uF ma\u017eiulis irgi nepamai\u0161ys.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Prisireik\u0117 man \u010dia vienam projektukui stabilizuoti maitinim\u0105, kad i\u0161sikraunant baterijai (9 V) \u012ftampa b\u016bt\u0173 stabili (6-7 V). Vienas papras\u010diausi\u0173 b\u016bt\u0173 t\u0105 padaryti b\u016bt\u0173 DC-DC keitiklio naudojimas ir jau galvojau d\u0117ti jau pam\u0117gtus Mornsun moduliukus, \u0161iuo atveju K7812JT-500R3-LB (6,5 V 500 mA): Kainuoja centus, efektyvus, stabilus ir geras. Bet kaip visada, lengviausi sprendimai ne man ,&#8230;<\/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-4826","post","type-post","status-publish","format-standard","hentry","category-elektronika"],"_links":{"self":[{"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/posts\/4826","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=4826"}],"version-history":[{"count":24,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/posts\/4826\/revisions"}],"predecessor-version":[{"id":4858,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/posts\/4826\/revisions\/4858"}],"wp:attachment":[{"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/media?parent=4826"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/categories?post=4826"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dclabs.lt\/dainiaus\/wp-json\/wp\/v2\/tags?post=4826"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}