DCDC menic z Ciny aneb jak si “usetrit” praci a odpalit par soucastek.

To se tak jednou rozhodnete usetrit si praci a koupit cinsky menic.

Vstup menice pripojite 12V, nastavite vystupni napeti na 32V a myslite si, ze vsechno bude fungovat jak ma. Tesne pred namontovanim do zarizeni jeste z cire paranoii zcela zbytecne zkusite, jak se bude menic chovat se vstupnim napetim 20V, ktere v zarizeni bude. Proc zbytecne? Menic ma rozsah vstupnich napeti 10 az 32V a vystupnich 12 az 35V.

Cvak a na multimetru je 60V. Co se to deje? Vypnete menic. Zkontrolujete povoleny rozsah vstupnich napeti. Cvak. 48V. 50V. Ze by regulace regulovala pomer vstupniho a vystupniho napeti (coz by byla neskutecna prasarna)? Vstup zpet na 12V a na vystupu je 48V. Bajecne. Zarizeni by shorelo pri 40V.

Nastaveny na vystupni napeti 24V a pripojeny ke zdroji s proudovym omezenim 0.6A nabiha spravne tak v jednom z deseti pripadu. S omezenim 1A asi ve dvou tretinach pripadu. S 1A a se zatezi (asi 0.8A na vstupu ve spicce) zatim nenabehl spravne ani jednou.

Chapu, ze nektere menice nenabehnou, pokud maji na vystupu prilis velkou zatez. Chapu, ze nektere maji problem bezet naprazdno (proto je na menicich casta LEDka, jako minimalni potrebna zatez). Ale poslat na vystup dvojnasobne napeti, to uz je sila.

Druhy menic se chova o neco lepe, ale i tak vygeneruje pri zapnuti spicku nejmene 35V (podle multimetru, ktery meri jen nekolikrat za sekundu) i kdyz je nastaven na 31V. Takze pro pripojeni dalsich obvodu bude nutny omezovac napeti.

Ze jsem si ten menic radsi nepostavil sam rovnou.

Posted by zelenohlav

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