chowotcha kutentha ntchito mfundo – kufanana resonance

pafupipafupi magetsi

Mphamvu ya ng’anjo yosungunuka ya induction imatenga kumveka kofanana mphamvu yapakati pafupipafupi supply, komwe ndiko kugwiritsa ntchito koyamba kwamagetsi apakatikati ku China. Ndi pafupipafupi kutembenuka chipangizo kuti otembenuka atatu gawo mphamvu pafupipafupi mphamvu AC mphamvu yamagetsi mu single-gawo wapakatikati pafupipafupi mphamvu magetsi. Ubwino wake ndi wakuti ali ndi mphamvu katundu kusinthasintha ndipo angagwiritsidwe ntchito ngati magetsi kwa chowotcha kutentha .

Chithunzi 2-1 chikuwonetsa chithunzithunzi cha gawo lalikulu lamagetsi ofananirako apakati pafupipafupi, omwe amapangidwa makamaka ndi switch yodzipatula (DK), AC contactor (kapena wophwanya dera lamagetsi KM), inductance yomwe ikubwera (L1 ~ L3) , ndi fast coupler (FU), rectifier (VT1 ~ VT6), smoothing reactor (LF), inverter (VT7 ~ VT10), parallel resonant load (L, C) . The rectifier atembenuza magawo atatu mphamvu pafupipafupi alternating panopa kulunjika panopa; riyakitala yosalala imagwiritsidwa ntchito kusefa mayendedwe aposachedwa ndikupatula ma voltages osiyanasiyana pakati pa chowongolera ndi inverter; inverter imatembenuza mphamvu yachindunji kukhala gawo limodzi lapakati pafupipafupi Alternating current; katundu wofanana wa resonant wopangidwa ndi inductor ndi compensation capacitor amatha kusintha kusintha kwa katundu panthawi yotentha.

Chithunzi 2-1 Parallel resonance intermediate frequency power supply main circuit

1 Mfundoyi ikuwonetsedwa pazithunzi 2-2. Popeza kuti zitsulo zotsekemera (LF) zimakhala ndi inductance yaikulu ndipo katunduyo ndi katundu wochititsa chidwi, katundu wamakono opangidwa ndi rectifier amapitirira komanso mzere wowongoka. Pamene aW60 °, mawonekedwe a mafunde amtundu wa rectifier circuit ndi ofanana ndi katundu wotsutsa, ndipo lamulo la conduction ndi lofanana ndi la katundu wotsutsa. Pamene a> 60 ° , chifukwa cha mphamvu ya inductor LF , thyristor idzayatsidwabe pambuyo poti mphamvu yamagetsi idutsa zero, mpaka thyristor yotsatira ikuyamba kuyatsa, kotero kuti malo olakwika akuwonekera mu mawonekedwe a waveform. mphamvu ya rectifier linanena bungwe, koma rectifier linanena bungwe panopa akadali Mmodzi mlingo

Waya. Pamene mbali yolamulira ikuwonjezeka kufika ku 90. Pamene madera abwino ndi oipa mu mawonekedwe amagetsi amtundu wamagetsi ali ofanana, mtengo wapakati wa voteji Ud = 0. Pamene a> 90 ° , dera lokonzanso limagwira ntchito mu inverter yogwira ntchito. Kusintha kwagawo kwagawo la rectifier yamagetsi apakatikati ndi 0 ° ~ 150 °.

(2) Inverter circuit Chithunzi 2-3 ndi chithunzi chojambula cha dera lofanana la inverter. The capacitor C mu dera katundu chikugwirizana mu kufanana ndi inductor koyilo L , ndipo commutation zimachokera pa mfundo kufanana resonance, choncho amatchedwa parallel resonance inverter dera. Magetsi a DC Ud operekedwa ndi thyristor-control control rectifier circuit amasintha mosalekeza, ndipo chozungulira chozungulira chofananira chimatembenuza mphamvu ya DC kukhala yapakatikati yamagetsi ya AC pakunyamula. Chingwe cham’mbali cha DC chili ndi fyuluta yayikulu ya LF, chifukwa chake ndi inverter yaposachedwa. Chifukwa mafupipafupi ogwiritsira ntchito ndi okwera kwambiri, ma thyristors a mikono 4 ya mlatho wa dera la inverter amatengera ma thyristors othamanga. L7 ~ L10 ndi njira yosinthira ya inverter thyristor, yomwe imagwiritsidwa ntchito kuchepetsa kuchuluka kwa kukwera kwa thyristor panthawi yakusintha.

Chithunzi 2-3 Schematic chojambula cha parallel inverter circuit