Emva kweminyaka ephantse ibeli-10 yophuhliso, iimoto zombane zamandla amatsha zenze uqokelelo oluthile lobuchwepheshe. Kukho ulwazi oluninzi ekuyilweni kweengxenye zezithuthi zombane kunye nokukhetha kunye nokuhambelana kwamacandelo. Phakathi kwabo, idizayini ye-resistor yokuchasa kwi-precharge circuit idinga ukuqwalasela iimeko ezininzi kunye neemeko zokusebenza. Ukukhethwa kwesixhobo sokuchasa i-precharge simisela isantya sexesha lokutshajwa kwesithuthi, ubungakanani besithuba esithathweisixhasi sokutshaja kwangaphambili, kunye nokhuseleko, ukuthembeka, kunye nokuzinza kombane onamandla ombane wesithuthi.
I-resistor ye-precharge yi-resistor ehlawulisa ngokukhawuleza i-capacitor kwinqanaba lokuqala le-high-voltage power-up yesithuthi. Ukuba akukho sixhathisi sokutshaja kwangaphambili, umsinga wokutshaja ngokugqithisileyo uya kwaphula i-capacitor. Umbane ophezulu we-voltage usetyenziswa ngokuthe ngqo kwi-capacitor, elingana nesiphaluka esifutshane ngokukhawuleza. Ukugqithiswa kwe-short-circuit current kuya konakalisa amacandelo ombane aphezulu.Ngoko ke, i-resistor precharge kufuneka ithathelwe ingqalelo xa uyila isiphaluka ukuqinisekisa ukhuseleko lwesekethe.
Kukho iindawo ezimbini aphoizixhasi zokuchasa kwangaphambilizisetyenziswa kwiisekethe zombane ophakathi kunye nophezulu wezithuthi zombane, ezizezi, isilawuli semotor precharge circuit kunye ne-high voltage accessory precharge circuit. Kukho i-capacitor enkulu kwisilawuli se-motor (inverter circuit), ekufuneka ihlawulwe kwangaphambili ukulawula i-capacitor yokutshaja yangoku. Izincedisi ezine-voltage ephezulu ngokubanzi zibandakanya i-DCDC (i-DC converter), i-OBC (itshaja ekwibhodi), i-PDU (ibhokisi yokuhambisa amandla ombane aphezulu), impompo ye-oyile, impompo yamanzi, i-AC (icompressor yomoya) kunye namanye amacandelo, kwaye kukho kwakhona. capacitors ezinkulu ngaphakathi amacandelo. , ngoko ke kufuneka ukutshaja kwangaphambili.
Izixhasi zokuchasa kwangaphambiliR, ixesha lokutshaja kwangaphambili T, kunye ne-precharge capacitor C efunekayo, ixesha lokutshaja ngokuqhelekileyo li-3 ukuya ku-5 amaxesha e-RC, kwaye ixesha lokutshaja liqhelekileyo li-milliseconds. Ngoko ke, ukutshaja kwangaphambili kunokugqitywa ngokukhawuleza kwaye akuyi kuchaphazela isicwangciso sokulawula amandla esithuthi. Umqathango wokugweba ukuba ukutshaja kwangaphambili kugqityiwe kukuba ingaba ifikelela kwi-90% yombane webhetri yamandla (ngokuqhelekileyo oku kunjalo). Xa ukhetha i-resistor precharge, le miqathango ilandelayo kufuneka ithathelwe ingqalelo: amandla ombane webhetri, i-contactor rated current, ixabiso le-capacitor C, ubushushu obuphezulu be-ambient, ukunyuka kweqondo lokushisa kwe-resistor, i-voltage emva kokutshaja kwangaphambili, ixesha lokutshaja kwangaphambili, ixabiso lokumelana ne-insulation, amandla e-pulse. Ifomula yokubala yamandla e-pulse sisiqingatha semveliso yesikwere se-voltage ye-pulse kunye ne-point capacitance C ixabiso. Ukuba i-pulse eqhubekayo, ngoko ke amandla apheleleyo kufuneka abe sisixa samandla azo zonke ii-pulses.
