PhakathiI-PFC eshintsha amandla kagesi, ukunikezwa kwamandla okushintshayo okulawulwayo kuyingxenye ebaluleke kakhulu.Umsebenzi wokushintsha amandla kagesi ku-PFC awuhlukile kakhulu kugesi oshintshwayo ojwayelekile, kodwa kunomehluko ekunikezeni amandla.Ukunikezwa kwamandla okushintsha okujwayelekile kudinga ukunikezwa kwamandla okulungisa kabusha okungu-220V, kuyilapho ukunikezwa kwamandla kwe-PFC kunikwa amandla yi-B+PFC.
Ngemuva kokulungiswa, ayikho i-capacitor yesihlungi eyengezwe, futhi i-voltage engahlungiwe yomjikelezo omuhle womjikelezo isetshenziswa njengomthombo wamandla we-chopper.Njengoba i-voltage eqondile ye-chopper "inqunyiwe" ibe ifomethi yamagagasi yamanje, izici ze-waveform yilezi:
1. I-waveform yamanje ayiqhubeki, futhi imvilophu yayo iyafana ne-voltage waveform, futhi isigaba semvilophu kanye ne-voltage waveform kuyafana.
2. Ngenxa yomphumela wokusika, amandla e-DC adonsa uhhafu aba yi-high-frequency (enqunywe yi-frequency yokunquma, cishe ngo-100khz) amandla "AC".La mandla “AC” wefrikhwensi ephezulu kufanele aphinde alungiswe ngaphambi kokuthi alawulwe ukusetshenziswa kwamandla okulandela kwe-PWM.
3. Ngokombono ojwayelekile wokunikezwa kwamandla kwangaphandle, isistimu yamandla ifinyelela ukuthi i-AC voltage kanye ne-AC yamanje isesigabeni futhi ama-voltage namagagasi amanje ahambisana ne-sinusoidal waveform, engaxazululi kuphela inkinga yesinxephezelo sesici samandla, kodwa futhi ixazulula izinkinga zokuhambisana kwe-electromagnetic kanye nokuphazanyiswa kwe-electromagnetic.
Amandla “amanje ashintshashintshayo” emvamisa ephezulu alungiswa yi-diode yokulungisa futhi ahlungwe ku-voltage yamanje eqondile abese enikezwa ugesi oshintshwayo we-PWM olandelayo.Le volthi ye-DC ibizwa nangokuthi i-B+PFC.I-voltage ye-B+PFC ekhishwa yi-chopper ngokuvamile iphakeme kuno-+300V ngemva kokulungiswa nokuhlunga kwasekuqaleni okungu-220 AC.Isizathu siwukuthi umugqa we-high-voltage ukhethiwe, ububanzi bomugqa we-inductor buncane, futhi umugqa we-voltage wehla kancane.Umthamo we-capacitor yesihlungi mancane, futhi umphumela wokuhlunga muhle, futhi kunezinzuzo eziningi ezifana nezidingo eziphansi zeshubhu yokushintsha ye-PWM engezansi.
Njengamanje, engxenyeni yokunikeza amandla eshintshwayo ye-PFC, ishubhu ye-chopper esebenza njengeswishi inezinhlobo ezimbili zokusebenza:
1. Imodi ye-continuous conduction (CCM): Imvamisa yokusebenza yeshubhu yokushintsha ihlala njalo, futhi umjikelezo womsebenzi wokuqhuba ushintsha nge-amplitude ye-voltage yokusika.
2. Imodi ye-Discontinuous conduction (DCM): Imvamisa yokusebenza yeshubhu yokushintsha i-chopper ishintsha ngosayizi we-voltage yokusika.
II-PFC ishintsha amandla kagesiingxenye kanye nengxenye ejabulisayo yengxenye yokushintshwa kwamandla kagesi ye-PWM ekulungiseni ukunikezwa kwamandla okushintshwa kwesici samandla konke kuqedwa yisekethe ehlanganisiwe, futhi i-IC eyodwa ingaqedela umklamo.
Isikhathi sokuthumela: Dec-27-2021