Sinkronizacija UC3842/43

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VSPACE="0">Izolirano napajanje za LCD DVM</B></U></A></div> <bR> </td> <td valign="top" height=400 BGCOLOR="#FFFFFF" TEXT="#080000"> <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> <div> <B><IMG SRC="53ecc7f0.gif" border=0 width="460" height="639" ALT="Eksterna sinkronizaciju UC3842, UC3843" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <div>      Shema prikazuje samo oscilatorski krug UC3842/43. Spoj ima ove karakteristike:</div> <bR> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.gif" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">UC3842/43 ne koristi svoj oscilator već je oscilatorski krug forsiran izvana. Tako može raditi i na jako niskim frekvencijama ili čak biti potpuno zaustavljen (0..200kHz)</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.gif" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Nakon dobivanja pozitivnog sinkronizacijskog brida sklop prvo generira pauzu od cca 200ns, a tek onda generira impuls</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.gif" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Trajanje generiranog impulsa je ograničeno trajanjem pozitivnog dijela sinkronizacijskog impulsa (ako se ne dogodi da struja pređe limitiranu vrijednost - Isen>1V)</div> <bR> <div>      Primjena: </div> <bR> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.gif" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Višekanalni generatori impulsa ili pretvarači sa sinkroniziranim radom. Npr naizmjenično ili u prstenstom slijedu.</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.gif" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Pojedinačni generator impulsa</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.gif" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Sinkroni generator strujnih impulsa</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.gif" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Izlazni driver stupanj sa zaštitom od preopterećenja (kod preopterećenja skraćuje impuls) npr. za pulsno širinski modulator napona kojim se upravlja DC motor (12, 24, 220V).</div> <bR> <div> Evo primjera upotrebe za izradu PWM izlaznog stupnja sa strujnom kontrolom (automatski skraćuje impuls kad se postigne maximalna struja). Faktor ispune impulsa od 0 do 99% (kod 100% bi se moglo dogoditi da se izlaz isključi kada struja pređe maksimalno dozvoljenu). Po potrebi se može dodati zavojnica u krugu motora radi ublažavanja strujnih špica i bolje podnošljivosti mogućeg kratkog spoja u motoru.</div> <bR> <div> <IMG SRC="53f168d0.gif" border=0 width="534" height="397" ALT="PWM driver DC motora sa nadstrujnom zaštitom" 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> <div>      Upozorenja:</div> <bR> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.gif" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Spoj nije pogodan za upotrebu sa UC3844/45 jer ti kontroleri imaju unutarnji djelitelj frekvencije oscilatora.</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f000000000.gif" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Sinkronizacija više istih sklopova u točno isto vrijeme nije sasvim moguća. Ako se bolje promotri, početak impulsa ovisiti će o trajanju pauze, koja opet ovisi od karakteristika oscilatora pojedinog čipa i tolerancije kondenzatora CT i paralelnog mu otpornika od 4,7K. Kraj trajanja impulsa kada se koristi strujni senzing ovisi o parametrima kruga (zavojnica, početna struja kroz zavojnicu, tolerancija shunta, ). Za očekivati je da će počeci impulsa biti unutar 10-50ns.</div> <bR> <div>      Sklop je primjenjen u jednom 10 kanalnom step up generatoru sa 5 mogućih načina sinkronizacije. Primjenom prstenaste sinkronizacije (svaki stupanj se pomiče u aktivaciji za 1/10 perioda) na 150kHz osnovne frekvencije cijeli sklop djeluje kao da radi na 1,5MHz. Dodatno svojstvo je da je potrošnja struje iz izvora ravnomjernija. Samim time su manji gubitci napona na dovodnim vodovima.</div> <bR> </td> </tr></table></body>