Ngemva kweminyaka ecishe ibe yi-10 yentuthuko, izimoto zikagesi zamandla amasha zenze ukunqwabelana okuthile kwezobuchwepheshe.Kunolwazi oluningi ekwakhiweni kwezingxenye zemoto kagesi kanye nokukhetha nokumataniswa kwezingxenye.Phakathi kwabo, umklamo we-precharge resistor ku-precharge circuit udinga ukucabangela izimo eziningi nezimo zokusebenza.Ukukhethwa kwe-precharge resistor kunquma isivinini sesikhathi sokushajwa kwemoto, ubukhulu besikhala esithathwei-precharge resistor, kanye nokuphepha, ukwethembeka, nokuzinza kukagesi wemoto onamandla amakhulu.
I-precharge resistor iyi-resistor eshaja kancane kancane i-capacitor esigabeni sokuqala samandla aphezulu we-voltage yemoto.Uma singekho i-precharge resistor, amandla okushaja ngokweqile azophula i-capacitor.Ugesi we-high-voltage usetshenziswa ngokuqondile ku-capacitor, okulingana nesifunda esifushane esisheshayo.I-current short-circuit yamanje izolimaza izingxenye zikagesi eziphezulu ze-voltage.Ngakho-ke, i-resistor precharge kufanele inakwe lapho uklama isifunda ukuze kuqinisekiswe ukuphepha kwesifunda.
Kukhona izindawo ezimbili laphoama-resistors we-prechargeasetshenziswa kumasekhethi kagesi aphakathi nendawo kanye naphezulu wezimoto zikagesi, okuyisekethi yokushajwa kwesilawuli semoto kanye nesekhethi yokushajwa kwesesekeli yamandla aphezulu kagesi.Kukhona i-capacitor enkulu kusilawuli se-motor (inverter circuit), edinga ukushajwa ngaphambili ukuze kulawulwe i-capacitor yokushaja yamanje.Izesekeli zamandla kagesi aphezulu ngokuvamile zifaka i-DCDC (i-DC converter), i-OBC (ishaja esebhodini), i-PDU (ibhokisi lokusabalalisa amandla kagesi aphezulu), iphampu kawoyela, iphampu yamanzi, i-AC (i-compressor air conditioning) nezinye izakhi, kanti futhi kukhona. ama-capacitor amakhulu ngaphakathi kwezingxenye., ngakho ukushajwa kwangaphambili kuyadingeka.
I-Precharge resistorsR, isikhathi sokushajwa ngaphambili T, kanye ne-precharge capacitor C edingekayo, isikhathi sokushajwa kuqala sivamise ukuthi izikhathi ezi-3 ukuya kwezi-5 ku-RC, futhi isikhathi sokushajwa ngaphambili ngokuvamile singama-millisecond.Ngakho-ke, ukushajwa kwangaphambili kungaqedwa ngokushesha futhi ngeke kuthinte isu lokulawula amandla emoto.Umbandela wokwahlulela ukuthi ukushajwa kwangaphambili kuqediwe ukuthi kufinyelela ku-90% wevoltage yebhethri yamandla (imvamisa kuba njalo).Lapho ukhetha i-resistor yokushajwa, kufanele kucatshangelwe izimo ezilandelayo: i-voltage yamandla ebhethri, i-contactor rated current, inani le-capacitor C, izinga lokushisa eliphakeme kakhulu le-ambient, ukukhuphuka kwezinga lokushisa kwe-resistor, i-voltage ngemva kokushajwa ngaphambi kwesikhathi, isikhathi sokushajwa, inani lokumelana nokushisa, amandla okushaya umoya.Ifomula yokubala yamandla okushaya kwenhliziyo iyingxenye yomkhiqizo wesikwele se-voltage ye-pulse kanye nenani lephoyinti le-C capacitance.Uma kuwukushaya kwenhliziyo okuqhubekayo, amandla aphelele kufanele abe isamba samandla awo wonke ama-pulses.
