K thut iu bin rng xung PWM trong b nghch lu

K thut iu bin rng xung PWM trong b nghch lu Ging vin : Hn Huy Dng

Nhm SV: Nhm 6 Thnh vin: L Tin Dng -20125438 Nguyn Tt Nam - 20125684 Nguyn Vit Hng- 20125593 Nguyn Vn Huy - 20125566Gii thiu chungB nghch lu l mt thit b bin i in p mt chiu DC thnh in p xoay chiu AC, vi hnh dng in p u ra, tn s, bin c th thay i c.

Phn loi nghch lu PWMNghch lu chia lm 2 loi chnh,nghch lu ph n cc v nghch lu lng cc.

B nghch lu thng thy nht trong i sng l b lu in cho PC - UPS.

Dng xung ca mchB nghch lu c chia lm nhiu loi, theo nhiu cch khc nhau, nhng ch yu l phn chia theo dng in p u ra:Xung vung Square waveXung sine iu chnh Modified sine waveXung sine Pure sine waveHai dng ph bin nht trong thc t l dng modified sine wave v pure sine wave.

4Gii thiu chungK thut PWM c a ra nhm mc ch tng hiu sut ca b inverter thng qua mt s chc nng:

Thay i c tn s v bin ca in p u ra, qua ph hp vi cc thit b in gia dng(VD: VN ngun in l 50Hz)To ra c dng in p u ra gn vi sng sine chun nht, ng thi gim cc hi bc cao thng qua cc k thut PWM nhiu mc.i lng tnh tonHai i lng cn quan tm khi xem xt v PWM l:sng mang v sng iu bin.

th xc nh thi im kch m ca Thyristor

7B nghch lu xung sin

in p DC : UDC = 220V

Tn s xung rng ca: fs = 20KHz

Tn s xung sin tham chiu: fsf = 50Hz, hai b pht lch pha 1800.

Cs8Dng sng iu bin:

Dng sng mang:

B nghch lu xung sin

10Cng thc c bnCng thc mch lc LC th in p ti thun tr

13 th in p ti tr cm

14Ch v mch PWMnh lng PWMDo yu cu ng ct vi tn s cao nn phn ln PWM thng s dng transistor nh:BJT,MOSFET,IGBT,. Lm phn t chuyn mch.ng dngInverter pure sine wave c ng dng rng ri trong i sng v hiu nng tt nht, cng nh in p u ra c dng sine gn chun, ph bin nht nh:

Cc b UPS online v offlineInverter s dng nng lng mt tri trong cc h thng nng lng sch.

Cc inverter ph bin nht c th k n ca cc hng Duracell hoc Samlex PST.17THANK YOU TEACHER !!!