Precizni termostat za 12V ventilator

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Temperatura uključenja ventilatora je podesiva od 0..55°C. Upotrebom trimera od 5K područje uključenja ventilatora je od 0..113°C. Temperatura isključenja je 2,5°C niža. Histereza za isključenje se može smanjiti povećanjem otpornika 470K na 1,2MR. Tada je histereza 1°C. Na histerezu utječe napon napajanja 12V i to direktno proporcionalno.</div> <div>      Nožice integriranih elemenata se broje od lijeva na desno (od naprijed). Prikazani sklop radi već 7 godina bez greške (uključuje prisilnu ventilaciju u linearnom regulatoru napajanja te sprečava pregrijavanje).</div> <bR> <div>      Umjesto ventilatora se može staviti špula 12V releja (uz dodanu zaštitnu diodu). Na taj način dobivate termostat koji uključuje izlaz kada temperatura pređe zadanu vrijednost. Relejem se može uključiti snažniji 220VAC ventilator. </div> <bR> <div> <IMG SRC="5ec79660.gif" border=0 width="377" height="358" ALT="Termostat za ventilator 12V" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-2650537455752702" crossorigin="anonymous"></script>  <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-2650537455752702" data-ad-slot="7117608876" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> <bR> <bR> <bR> <div>   <A NAME="termostat_za_auto_hladnjak"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="1" ALIGN="bottom" WIDTH="1" HSPACE="0" VSPACE="0" ></A>Za automobilsku primjenu (uključenje ventilatora na hladnjaku) shema se može modificirati tako da ventilator može ostati raditi i nakon isključenja kontakta. Tada, nakon isključenja ventilatora, sklop prestaje trošiti struju iz akumulatora te nema opasnosti od ispražnjenja akumulatora. U principu, bolje je staviti originalni termostat, ali postoje slučajevi kada zamjenski termostati otkazuju prečesto te ugrožavaju cijeli motor. Tada je jednostavnije instalirati vlastiti pozdani termostat nego biti u riziku da cijela mašina prokuha u slučaju otkazivanja.</div> <bR> <div> <IMG SRC="5437a880.gif" border=0 width="378" height="392" ALT="Termostat za ventilator automobila" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <div>      Upozorenje: Kako senzor LM335 ima konačan unutarni otpor sa promjenom napona napajanja dolazi do smanjene promjene i na senzoru. U slučaju da je promjena napona napajanja zbog uključenja releja znatna može poništiti i zadanu histerezu. Tada treba smanjiti otpornik za definiranje histereze ili stabilizirati struju kroz senzor LM335. Ovo zadnje se lako izvodi sa npr. stabilizatorom napona LM78L05 u krugu napajanja senzora. Umjesto 4K7 se treba staviti 1K.</div> <div>      Pinovi su brojeni od lijeva na desno.</div> </td> </tr></table></body>