Nkhani

Nkhani

AC ikugwira ntchito, RC surge mayamwidwe dera kapangidwe & kusankha chigawo Share

 AC voteji : Pansi pa AC kapena DC voteji, kapena kuphatikiza DC, mutha kugwiritsa ntchito ma capacitor onse a HVC. Mfundo yogwiritsira ntchito bwino ndi: 1) Musapitirire mphamvu yamagetsi ya dielectric; 2) Sungani capacitor yozizira; 3) Osanyamula opareshoni ya corona. Monga ntchito yothandiza, nayi momwe mumagwiritsira ntchito malamulo atatuwa.

Chiwongola dzanja chocheperako ndi voteji ya DC. Chepetsani zomwe zili pachimake chomwe chilipo pamlingo wa kuchuluka kwa mphamvu ndi DV / DT yovotera. Pakuti mkulu pafupipafupi ntchito kuchepetsa mphamvu zikutha, kotero kuti kutentha kukwera kwa casing akunja si upambana 15 ° C, ndipo nthawi yomweyo casing akunja kutentha si apamwamba kuposa pazipita ntchito kutentha.

Pa lamulo 3, chepetsa mphamvu yamagetsi yakunja pamtundu uliwonse wa AC kuti mupewe corona.
Corona ndi insulating system mu insulating system kuti ipangitse kuwonongeka pang'ono kwa dielectric ndi ma air pores. Kupezeka kwake kumatsagana ndi magetsi a AC chifukwa mphamvu yake ya pore ndiyotsika kuposa zida zozungulira za dielectric. Monga capacitor yamtengo wapatali imalumikizidwa mndandanda, pore imathyoledwa ndi gradient yapamwamba kwambiri. Chimanga Dizzy chiyenera kupewedwa chifukwa zonyezimira zimapangitsa kuti dielectric carbonization isinthe kukhala chinthu chowongolera, ndipo mpweya womaliza wa carbon travo ndi wozungulira.

 

RC mayamwidwe / snubber dera kapangidwe

Mayamwidwe a Surge ndi njira zingapo zosavuta zolumikizira mphamvu kuti athetse ma spikes amagetsi omwe amayamba chifukwa cha loop inductance ----- Pamene ma switch amakina kapena semiconductor amayatsidwa. Cholinga cha mayamwidwe owonjezera ndikuchotsa ma voltages osakhalitsa ndi ma oscillation omwe amapezeka pomwe switch yayatsidwa.
Izi zimachitika kuti zipereke dera losasankha pomwe magetsi akuyenda mu choyambitsa chodutsira chokhazikika pomwe switch yayatsidwa. Sub-mayamwidwe mu lophimba mode mphamvu magetsi amapereka chimodzi kapena zingapo zotsatirazi ntchito zofunika:
1) Sinthani chonyamulira mzere wa bipolar kutembenuka transistor kusunga mu malo otetezeka ntchito;
2) Chotsani mphamvu kuchokera ku chiwongolero cha transistor, idyani mphamvu muzitsulo kuti muchepetse kutentha kwapakati;
3) Chepetsani oscillation pa switching transistor kapena rectifier diode kuti muchepetse mphamvu yamagetsi, kuchepetsa EMI pochepetsa kutulutsa ndikuchepetsa ma frequency ake.

 

Mayamwidwe a soot omwe amagwiritsidwa ntchito kwambiri ndi capacitor ndi resistor angapo kudzera pa switch. Umu ndi momwe mungapangire damper yanthawi zonse ya RC:
 
Kusankha Kwachigawo: Sankhani chotsutsa chopanda inductor. Chosankha chabwino ndi chotsutsa cha carbonaceous. Kukaniza filimu ya kaboni ndi chisankho chabwino pokhapokha ngati chichotsedwa kuti chichepetse kukana kwake pakulimbana kozungulira. Pewani kupiringa chifukwa ili ndi inductance. Kusankha kutsutsa kuchokera pa pepala la deta kuti athe kupirira kutentha kwapamwamba kwa kutentha komweko mu damper. Papamwamba 0.01 μF capacitance, mica capacitor ya kumizidwa epoxy resin imaganiziridwa poyamba. Pazinthu zapamwamba za capacitance, vertical lead polypropylene, foil film capacitors amaganiziridwa. Kuphatikiza pa kulowetsedwa kwakukulu kwa chipangizo cha axial, mtundu wa WPP wa axial lead ulinso wabwino. Magetsi okwera kwambiri ndi 630 volts DC, apamwamba kwambiri ndi 1000 volts DC. Kuti voteji yapamwamba ndi capacitance, polypropylene zojambulazo filimu capacitor amasankhidwa, kuphatikizapo kuyandama, metallization filimu monga wamba zojambulazo filimu kukwaniritsa kukula kochepa. Kugwiritsiridwa ntchito kwa filimu ya metallization kumachepetsa nsonga yamakono kuti ipange 1/3 mpaka 1/5 ya kusankha kwina kwakukulu.
 
Njira yosankha mu datasheet ndi yosavuta - pakali pano ndipo mphamvu yaposachedwa ya RMS imaperekedwa ndi mphamvu yovotera. Kuthekera kwakukulu kumapangidwa ndi mphamvu ya DV / DT komanso mphamvu yadzina. Mphamvu yapano ya RMS ndi mtengo wocheperako womwe capacitor ndi 10 ° C kapena pakalipano ya capacitor kuti ifike pamagetsi ake osinthira.
 

Gome lathu lamphamvu la DV / DT litha kugwiritsidwa ntchito kufananiza ma capacitor oyamwa a CDE ndi mitundu ina. Pamayamwidwe onse a maopaleshoni, mtengo wa DV / DT utha kupirira mtengo wa DV / DT, ndipo mtundu wa HPP umatha kupirira kuposa 2000 V / μs. Kwa zotsekemera zothamanga kwambiri, mitundu ya HPFF ndi HPPS imatha kukonza zoposa 3,000 V / μs; Mitundu ya HPMF ndi HPPM, kuchotsa zoposa 1000 V / μs. Kuti muwone tebulo la data malinga ndi kutalika kwa nyumbayo.

 

Ma capacitors ena: Pano pali chiganizo chomaliza cha kusankha kwa capacitor, kukuthandizani kuti mulowe mu gawo la uniced capacitance, lomwe silinatchulidwe pogwiritsira ntchito surge absorber, komanso siliri mu gawo ili.


Ndiko kudziwa za mtundu ndi mitundu ya ceramic yapamwamba kwambiri yomwe ili ndi nsonga yochepera yapano komanso yosakhalitsa, ndipo dongosolo ndi 50 mpaka 200 V / μs. Polyester ili ndi nthawi 15 kutayika kwa polypropylene, ndipo poliyesitala ndiyoyenera kutsika kwa RMS yapano kapena yozungulira. Panthawi imodzimodziyo, onetsetsani kuti magetsi ndi kutentha kwa coefficients akuganiziridwa. Ngakhale mica kapena DPP mtundu capacitance pafupifupi popanda voteji ndi kutentha, high-k ceramic dielectric (monga Y5V) akhoza kutaya 1/4 mphamvu yake kuchokera firiji mpaka 50 ° C (122 ° F), kuchokera 0 mpaka 50% . Mphamvu ina ya 1/4 imatha kutayika panthawi yamagetsi ovotera.

Fast Board Absorber Design: Pamene kugwiritsa ntchito mphamvu sikofunikira, pali njira yachangu yopangira chowombera. Konzani ndi 2 watts of carbonaceous resistance. Sankhani mtengo wotsutsa kuti mphamvu yomweyi ipitirire kuyenda popanda kukwera kwa voteji, ndipo panopa imatembenuzidwa ku surge absorber pambuyo poyatsa. Nthawi yomwe ikuyenda kudzera pa switch musanayambe kuyeza kapena kuwerengera kwa switch, ndi nthawi yomwe ikuyenda isanatsegule.