iindaba

PhakathiI-PFC yokutshintsha izixhobo zamandla, unikezelo lwamandla okutshintsha olulawulwayo luyinxalenye ebaluleke kakhulu.Umsebenzi wokutshintsha umbane kwi-PFC awufani kakhulu nombane oqhelekileyo wokutshintsha, kodwa kukho umahluko kunikezelo lwamandla.Ukutshintsha okuqhelekileyo konikezelo lwamandla kufuna unikezelo lwamandla ohlaziyiweyo oyi-220V, ngelixa unikezelo lwamandla ePFC luqhutywa yi-B+PFC.

Emva kokulungiswa, akukho capacitor yokucoca yongezwayo, kwaye i-voltage ye-pulsating positive-half-cycle voltage isetyenziswa njengamandla ombane we-chopper.Ekubeni i-voltage echanekileyo ye-chopper "inqunyulwe" ibe yi-waveform yangoku, iimpawu ze-waveform zezi:
1. I-waveform yangoku iyayeka, kwaye imvulophu yayo iyafana ne-voltage waveform, kwaye isigaba semvulophu kunye ne-voltage waveform iyafana.
2. Ngenxa yomphumo wokunqunqa, i-half-pulsating DC power iba yi-high-frequency (igqitywe yi-frequency chopping, malunga ne-100khz) "AC" amandla.La mandla aphezulu "AC" kufuneka alungiswe kwakhona phambi kokuba alawulwe kusetyenziso lwaMandla olulandelayo lwePWM.
3. Ukusuka kwimbono jikelele yonikezelo lwamandla lwangaphandle, inkqubo yamandla ifezekisa ukuba i-AC voltage kunye ne-AC yangoku ikwisigaba kwaye i-voltage kunye ne-wave waveforms yangoku ihambelana ne-sinusoidal waveform, engasombululi kuphela ingxaki yembuyekezo yamandla ombane, kodwa ikwasombulula iingxaki zokuhambelana kwe-electromagnetic kunye nokuphazamiseka kwe-electromagnetic.

I-high-frequency "alternating current" amandla ahlaziywa yi-diode yokuhlaziya kwaye ahluzwe kwi-voltage yangoku ngokuthe ngqo kwaye emva koko anikwe ukunikezelwa kombane wokutshintsha kwe-PWM elandelayo.Lo mbane weDC ukwabizwa ngokuba yiB+PFC.Imveliso yombane ye-B+PFC yi-chopper iphezulu kune-+300V emva kokulungiswa kwe-220 AC yokuqala kunye nokucoca.Isizathu kukuba umgca we-high-voltage ukhethiwe, ububanzi bomgca we-inductor buncinci, kwaye umgca we-voltage wehla encinci.Umthamo we-capacitor yokucoca umncinci, kwaye umphumo wokucoca ulungile, kwaye kukho iingenelo ezininzi ezifana neemfuno eziphantsi kwi-tube yokutshintsha ye-PWM esezantsi.

Okwangoku, kwi-PFC yokutshintsha umbane inxalenye, ityhubhu ye-chopper esebenza njengetshintshi ineendlela ezimbini zokusebenza:
1. Imodi yokuqhubela phambili eqhubekayo (i-CCM): I-frequency yokusebenza ye-tube yokutshintsha isigxina, kwaye umjikelezo womsebenzi wokuqhuba utshintsho kunye ne-amplitude ye-voltage chopping.
2. Imodi yokuqhubela phambili yokuyeka (i-DCM): I-frequency yokusebenza ye-tube yokutshintsha i-chopper itshintsha kunye nobukhulu be-voltage yokusika.

IUkutshintshela umbane wePFCinxalenye kunye nenxalenye evuselelayo ye-PWM yokutshintsha umbane inxalenye yombane wokuguqula umbane wokutshintsha umbane ugqitywe yisekethe edibeneyo, kunye ne-IC enye inokugqiba ukuyila.