Ukulawula ukuwela i-Zero kuyindlela evamile kakhulu yokulawulaisilawuli samandla, ikakhulukazi uma umthwalo kuwuhlobo oluphikisayo.
I-thyristor ivuliwe noma ivaliwe lapho i-voltage ingu-zero, futhi amandla angashintshwa ngokulungisa isilinganiso se-thyristor ngesikhathi sokuvala nokuvala.Imodi yokulawula ukuwela iqanda singayihlukanisa ibe isikhathi esimisiwe sokulawula ukuwela uziro kanye nesikhathi esiguquguqukayo sokulawula ukuwela uziro ngezindlela ezimbili.
Isikhathi esinqunyiwe Imodi yokulawula ukuwela uziro (PWM zero crossing):Imodi yokulawula ukuwela uziro yenkathi egxilile iwukulawula amandla amaphakathi omthwalo ngokulungisa umjikelezo wokuvala umsebenzi esikhathini esimisiwe.Ngenxa yokuthi ivuliwe futhi ivaliwe endaweni ye-zero yokunikezwa kwamandla, kuyunithi yegagasi eligcwele, ayikho ingxenye yamagagasi esigamu, ngeke ikhiqize ukuphazamiseka kwe-high-frequency, futhi isici samandla singafinyelelwa, ngakho-ke singamandla amakhulu. -ukonga.
Isikhathi esiguquguqukayo sokulawula ukuwela uziro (CYCLE zero crossing):Inkathi eguquguqukayo yemodi yokulawula ukuwela uziro nayo ingukulawula kokucisha ekuweleni uziro kokuphakelwa kwamandla.Uma kuqhathaniswa nemodi ye-PWM, asikho isikhathi sokulawula esinqunyiwe, kodwa isikhathi sokulawula sifinyezwa ngangokunokwenzeka, futhi imvamisa ihlukaniswa ngokulinganayo ngokuya ngamaphesenti okukhiphayo phakathi nesikhathi sokulawula.Futhi ku-wave egcwele njengeyunithi, ayikho ingxenye yamagagasi esigamu, engafinyelela isici samandla, kodwa futhi yonga ugesi.
Kusukela esithombeni esingezansi, singabona ngokucacile ukuthi ngaphansi kwemodi yokulawula ukuwela i-zero, ukuze ulungise amandla okukhiphaabalawuli bamandla, singakwazi ukufeza injongo yokulawula amandla ngokulungisa inani lemijikelezo ye-SCR yokuvula nokuvala, okulula kakhulu.Kodwa-ke, sizobona futhi ukuthi ukulawulwa kwefrikhwensi kulungele kuphela izikhathi lapho ukunemba kokulawula kungabi phezulu, uma izidingo zokulawula ziphezulu, khona-ke indlela yokulawula imvamisa ayifanele.
Isikhathi sokuthumela: Dec-22-2023