97161860 Bbdt VP Buck Boost

BO NGUON MOT CHIEU CHE O XUNG

CHNG 1

B BIN I DC/DC TUYN TNH C BN

iu khin in p ng ra V0 bng cch iu khin dng IB Khuyt im : Tn hao cng sut trn BJT = VCEIL

B BIN I DC/DC C BN CH XUNG

Nguyn l lm vic : iu khin ng ct kha D = tON/T u im : Hiu sut cao Khuyt : nhp nh in p

B BIN I DC/DC DNG BUCK

S nguyn l b Buckhttp://www.dimensionengineering.com/DE-SW0XX.htm

http://www.dimensionengineering.com/DE-SW0XX.htm

http://www.dimensionengineering.com/DE-SWADJ.htm


Cc c im khi mch trng thi xc lp :Dng qua cun L tun hon vi chu k Tin p trung bnh trn cun khng bng 0Dng trung bnh qua t in bng 0Cng sut ng ra bng cng sut ng vo


Cc gi thit :Mch vn hnh xc lpDng qua cun khng lin tc (lun dng) T in rt ln, in p ng ra khng i v c gi tr V0 Chu k ng ct T, thi gian ng : DT, ngt : (1-D)T

BO BIEN OI BUCK CHE O DONG LIEN TUCKhi kha S ng :

Trng thi mch S tng ngCc phng trnh p & dng

BO BIEN OI BUCK CHE O DONG LIEN TUC2. Khi kha S ngt : Diode D dn

Trng thi mch S tng ngCc phng trnh p & dng

BO BIEN OI BUCK CHE O DONG LIEN TUCGin p v dng b bin i Buck p trn cun L Dng qua cun LDng qua t C

BO BIEN OI BUCK CHE O DONG LIEN TUCS bin thin dng iL khi kha ng v ngt l nh nhau quan h gia p ng vo v ng ra

BO BIEN OI BUCK CHE O DONG LIEN TUCTnh tan gi tr dng qua cun L :

BO BIEN OI BUCK CHE O DONG LIEN TUCGi tr Lmin dng IL lin tc :iLmin = 0

BO BIEN OI BUCK CHE O DONG LIEN TUC nhp nh p t C khi gi tr t gii hn :

BO BIEN OI BUCK CHE O DONG LIEN TUCBi tp : B bin i DC-DC dng Buck c cc thng s nh sau: Vs= 50V; D=0.4; L= 400H; C=100 F; f=20kHz; R=20. Gi thit cc linh kin l tng, hy tnh :in p ng ra V0 Tnh gi tr dng qua cun cm nh nht v ln nht nhp nh in p t

BO BIEN OI BUCK CHE O DONG LIEN TUCp : 20V 1.75A, 0.25A 0.469%

BO BIEN OI BUCK CHE O DONG LIEN TUC

BO BIEN OI BUCK CHE O DONG LIEN TUCBi tp thit k: Thit k b bin i DC-DC dng Buck cung cp in p ng ra c gi tr 18V cp cho ti R = 10. Nu in p ng vo Vs=48V. nhp nh in p ng ra khng c vt qu 5%. Thit k sao cho dng qua cun khng lin tc. Chn tn s lm vic l 40kHz.Tnh t s ng kha D Tnh ton gi tr L, C

BO BIEN OI BUCK CHE O DONG LIEN TUCD = 0.375 Lmin = 78uH, chn L = 1.25LminCmin = 100uF

BO BIEN OI BOOST CHE O DONG LIEN TUC

BO BIEN OI BOOST CHE O DONG LIEN TUCng dng : Xe in hybrid Ngun LED

BO BIEN OI BOOST CHE O DONG LIEN TUCCc gi thit :Mch vn hnh xc lpDng qua cun khng lin tc (lun dng) T in rt ln, in p ng ra khng i v c gi tr V0 Chu k ng ct T, thi gian ng : DT, ngt : (1-D)T

BO BIEN OI BOOST CHE O DONG LIEN TUCTrng thi mch S tng ngCc phng trnh p & dngKhi kha ng :

BO BIEN OI BOOST CHE O DONG LIEN TUCTrng thi mch S tng ngCc phng trnh p & dngKhi kha ngt :

BO BIEN OI BOOST CHE O DONG LIEN TUCCc gin p v dng cun cm, t in

BO BIEN OI BOOST CHE O DONG LIEN TUCThit lp mi quan h gia Vo v Vs ?S bin thin dng iL khi kha ng v ngt l nh nhau quan h gia p ng vo v ng ra

BO BIEN OI BOOST CHE O DONG LIEN TUCTnh ton dng trung bnh qua cun L : IL ?

BO BIEN OI BOOST CHE O DONG LIEN TUCiu kin dng qua L lin tc : Imin = 0

BO BIEN OI BOOST CHE O DONG LIEN TUCTnh ton nhp nh in p ti : V0/V0 = ??

BO BIEN OI BOOST CHE O DONG LIEN TUCBi tp :Thit k b bin i boost vi in p ra l 30V. in p ng vo l 12V. Thit k sao cho dng qua cun khng lin tc v nhp nh in p thp hn 1%. Ti R = 50. Tn s ng ct c th chn 25kHz.Gii :D = 0.6Lmin = 96uH => L = 120uHC > 48uF

BO BIEN OI BOOST CHE O DONG LIEN TUCBi tp 2:B bin i Boost vn hnh vi Transistor c ton=50us nhm chuyn i in ng vo 50V thnh 75V ng ra. Cun khng c gi tr 250uH v ti R=2.5Ohm.1. Tnh tn s ng ct, gi thit dng cun khng lin tc2. Tnh tr trung bnh dng ng vo v ng raV dng cun khng, ch gi tr dng min, maxTnh tr RMS dng t

p s:1. 6.6kHz2. 45A, 30AImax=50A, Imin=40A21.3A

BO BIEN OI BUCK-BOOST in p ng ra c th iu khin cao hn hay thp hn in p ng vo S nguyn l b Buck- Boost

BO BIEN OI BUCK-BOOST Gi thit:Mch vn hnh xc lpDng qua cun khng L lin tcT in ln => p ng ra khng iThi gian ng kha : DT, ngt : (1-D).TCc linh kin l tng

BO BIEN OI BUCK-BOOST Trng thi mch S tng ngCc phng trnh p & dngKhi kha ng :

BO BIEN OI BUCK-BOOST Trng thi mch S tng ngCc phng trnh p & dngKhi kha ngt :

BO BIEN OI BUCK-BOOST Thit lp mi quan h gia Vo v Vs :

BO BIEN OI BUCK-BOOST Gin p v dng cun cmGin dng diode v dng t in

Tnh ton dng trung bnh qua cun L : IL ?BO BIEN OI BUCK- BOOST

iu kin dng qua L lin tc : Imin = 0

BO BIEN OI BUCK- BOOSTTnh ton nhp nh in p ti : V0/V0 = ??

Bi tp 1 : Thng s b bin i Buck- Boost:Vi= 24V ; D = 0.4, R = 5 Ohm, L = 100uH, C = 400uF, f = 20kHz Hy xc nh :in p ng ra Vo V gin dng qua cun cm nhp nh in pBO BIEN OI BUCK- BOOST-16V IL = 5.33 A; ILmax = 7.73A; ILmin = 2.93A1%

Bi tp 1 : Thng s b bin i Buck- Boost:Vi= 24V ; D = 0.4, R = 5 Ohm, L = 100uH, C = 400uF, f = 20kHz Hy xc nh :BO BIEN OI BUCK- BOOST

Bi tp 2:Thit k b bin i Buck- Boost cung cp cho ti 75W in p 50V vi in p ngun l 40V. nhp nh in p khng ln hn 1%. BO BIEN OI BUCK- BOOST

BO BIEN OI CUKS nguyn l b bin i Cuk

BO BIEN OI CUKc im:in p ng ra c th iu khin cao hn hay thp hn in p ng vo in ap ngo ra ao du

BO BIEN OI CUKGia thit :Hai cun khng co gia tri ln =>dong qua chung khng iHai t in ln => p trn tu khng iMach vn hanh xac lpThi gian ng kha : DT, ngt : (1-D).TCc linh kin l tng

BO BIEN OI CUKTrng thi mch S tng ngCc phng trnh p & dngKhi kha ng :

BO BIEN OI CUKTrng thi mch S tng ngCc phng trnh p & dngKhi kha ngt :

BO BIEN OI CUKQuan h in ap V0 va Vs ?

BO BIEN OI CUKQuan h in ap V0 va Vs : Do dng trung bnh qua t C1 bng 0, suy ra :

BO BIEN OI CUKThay vo trn, suy ra :

BO BIEN OI CUK nhp nh p t C2 suy ra tng t b Buck

BO BIEN OI CUK nhp nh p t C1 suy ra khi kha ngt:

BO BIEN OI CUK nhp nh dng qua cun khng suy ra khi kha ng:

BO BIEN OI CUKBi tp:Thit k b bin i Cuk vi in p ra l -18V. in p ng vo l 12V. Thit k sao cho nhp nh dng qua cc cun khng khng vt qu 10% dng trung bnh, nhp nh in p ng ra thp hn 1% v nhp nh in p trn t C khng vt qu 5%. Cng sut ti l 40W. Tn s ng ct c th chn 50kHz.

BO BIEN OI CUKBi tp:Thit k b bin i Cuk vi in p ra l -18V. in p ng vo l 12V. Thit k sao cho nhp nh dng qua cc cun khng khng vt qu 10% dng trung bnh, nhp nh in p ng ra thp hn 1% v nhp nh in p trn t C khng vt qu 5%. Cng sut ti l 40W. Tn s ng ct c th chn 50kHz.Gii :D = 0.6L2 649uH ; L1 432uH Co 3.08uF ; C 17.8uF

*Phng phap chungCHNG 101/04/96*********

Documents

97161860 Bbdt VP Buck Boost