A. Ukuphepha okuhle komkhiqizo kanye nokumelana okunamandla kwe-overvoltage

Njengoba ama-capacitor efilimu enezakhiwo zokuziphilisa futhi aklanywe ngokuhambisana nezinga le-1EC61071, ukumelana kwe-voltage yokukhuphuka kwe-capacitor kungaphezu kuka-1.5 we-voltage elinganisiwe. Ngaphezu kwalokho, i-capacitor isebenzisa ubuchwepheshe befilimu ehlukanisiwe, ngakho-ke i-capacitor ngeke ikhiqize ukuwohloka kwe-short circuit ngokwethiyori, okuthuthukisa kakhulu ukuphepha kwalolu hlobo lwe-capacitor. Imodi yokuhluleka evamile i-open circuit. Ezinhlelweni ezithile, ukumelana kwe-peak voltage ye-capacitor nakho kuyinkomba ebalulekile yokuhlola ama-capacitor. Eqinisweni, kuma-capacitor e-electrolytic, i-voltage ephezulu yokukhuphuka evunyelwe iyizikhathi eziyi-1.2, okuphoqa abasebenzisi ukuthi bacabangele i-peak voltage kune-voltage evamile.

B. Izici ezinhle zokushisa, ububanzi bokushisa komkhiqizo bubanzi, kusukela ku--40C-105C

Ifilimu ye-polypropylene eshisa kakhulu esetshenziswa ku-capacitor yefilimu yokusekela i-DC inokuqina kokushisa okungekhona ifilimu ye-polyester nama-capacitor e-electrolytic. Njengoba izinga lokushisa likhuphuka, amandla e-polypropylene film capacitor ayancipha iyonke, kodwa isilinganiso sokwehla sincane kakhulu, cishe ku-300PPM/C; kuyilapho amandla efilimu ye-polyester eshintsha kakhulu ngokushisa, kungakhathaliseki ukuthi kusesigabeni sokushisa okuphezulu noma esigabeni sokushisa esiphansi, okungu-+200~+600PPM/C.

C. Izici zemvamisa ezizinzile, izici ezinhle zemvamisa ephezulu yomkhiqizo

Njengamanje, amaza amaningi okushintshana kwezilawuli angaba ngu-10K HZ, okudinga ukuthi umkhiqizo ube nokusebenza kahle kwemvamisa ephezulu. Kuma-capacitor e-electrolytic kanye nama-capacitor efilimu ye-polyester, lesi sidingo siyinkinga.

D. Akukho polarity, ingamelana ne-reverse voltage

Ama-electrode ama-capacitor efilimu ayizinsimbi ezincane ezifakwe kumafilimu amancane. Umkhiqizo awunayo i-polarity, ngakho-ke kulula kakhulu kubasebenzisi, futhi asikho isidingo sokucabangela izigxobo ezinhle nezimbi. Kuma-capacitor e-electrolytic, uma i-voltage ebuyela emuva edlula izikhathi ezingu-1.5 ze-Un isetshenziswa ku-capacitor ye-electrolytic, izobangela ukusabela kwamakhemikhali ngaphakathi kwe-capacitor. Uma le voltage ihlala isikhathi eside ngokwanele, i-capacitor izoqhuma, noma i-electrolyte izophuma njengoba ingcindezi yangaphakathi ye-capacitor ikhishwa.

E. I-voltage ekalwe kakhulu, akudingeki ama-resistor ochungechunge kanye nokulinganisela

Ukuze kwandiswe amandla okukhipha, i-voltage yebhasi yezimoto ezihlanganisiwe kanye nezimoto zamaseli kaphethiloli inomkhuba wokwanda. Ama-voltage ajwayelekile ebhethri anikezwa izinjini emakethe angama-280V, 330V kanye nama-480V. Ama-capacitor afana nawo ahlukile kubakhiqizi abahlukene, kodwa ngokuvamile angama-450V, 600V, 800V, futhi umthamo wawo usukela ku-0.32mF kuya ku-2mF. I-voltage elinganisiwe yama-capacitor e-electrolytic ayiphakeme kune-500V, ngakho-ke lapho i-voltage yebhasi iphakeme kune-500V, uhlelo lungathuthukisa kuphela izinga le-voltage yokumelana nebhange le-capacitor ngokuxhuma ama-capacitor e-electrolytic ochungechungeni. Ngale ndlela, akukhuliswanga kuphela ivolumu kanye nezindleko zebhange le-capacitor, kodwa futhi ne-inductance kanye ne-ESR kusekethe kuyakhuliswa.

F. I-ESR ephansi, ukumelana okunamandla kwamanje kwe-ripple

I-capacitor yefilimu inkulu kune-200mA/μF, kanti i-capacitor ye-electrolytic inamandla okushintshashintsha kwamanje angu-20mA/μF. Lesi sici singanciphisa kakhulu amandla e-capacitor adingekayo ohlelweni.

G. I-ESL Ephansi

Ukwakheka kwe-inductance ephansi kwe-inverter kudinga ukuthi ingxenye yayo eyinhloko, i-DC-Link capacitor, ibe ne-inductance ephansi kakhulu. Ama-capacitor efilimu yesihlungi se-DC-Link DC asebenza kahle kakhulu ahlanganisa i-busbar kumoduli ye-capacitor ukuze anciphise i-self-inductance yayo (<30nH), okunciphisa kakhulu umphumela wokunyakaza ngemvamisa yokushintsha edingekayo. Ngakho-ke, i-capacitor yokumunca exhunywe ngokuhambisana ne-capacitor ye-DC-Link ivame ukushiywa, futhi i-electrode ye-capacitor ixhunywe ngqo ku-IGBT.

H. Ukumelana okunamandla kwamanje okwandayo

Ingamelana nemisinga emikhulu esheshayo. Ubuchwepheshe bokusika amagagasi kanye nobuchwepheshe bokujiya kwe-capacitor coating kungathuthukisa izinga lokushisa lomkhiqizo kanye namakhono okushaqeka komshini.

J. Impilo ende yenkonzo

Izici zokungagugi kwefilimu zinquma ukuthi i-capacitor yefilimu inokuphila isikhathi eside kakhulu, ikakhulukazi ku-voltage elinganisiwe kanye nokushisa okulinganisiwe kokusebenza, impilo yesevisi ingaphezu kwamahora angu-15000-20000; uma isilinganiso singama-30Km/H, ingaba nama-450000Km empilweni yesevisi, futhi impilo ye-capacitor yanele ibanga lemoto.

 

Ama-capacitor efilimu e-DC-LINK asebenza kahle kakhulu angama-capacitor asebenzisa izinqubo ezintsha zokukhiqiza kanye nobuchwepheshe befilimu obusebenzisa insimbi. Andisa ubuningi bamandla ama-capacitor efilimu yendabuko, okusho ukuthi usayizi wama-capacitor nawo uyancishiswa. Ngakolunye uhlangothi, ihlanganisa i-capacitor core kanye ne-busbar ukuze ihlangabezane nezidingo zosayizi eziguquguqukayo zamakhasimende, okungenzi nje kuphela ukuthi yonke i-inverter module ibe ncane kakhulu, kodwa futhi kunciphisa kakhulu ukungena kwe-inductance elahlekile kusekethe yesicelo, okwenza ukusebenza kwesekethe kuzinze kakhudlwana. Umklamo wesekethe osetshenziswa ezimotweni zikagesi une-voltage ephezulu, i-current esebenza kahle kakhulu, i-overvoltage, i-voltage ebuyela emuva, i-current ephezulu, kanye nezidingo zokuphila isikhathi eside. Ama-capacitor efilimu ngokungangabazeki ayizikhethelo zezimoto zikagesi njengama-capacitor asekela i-DC.