S BUCK

TRNG I HC BCH KHOA H NIVIN IN T- VIN THNG

N P BUCK

Gio vin hng dn: TS. Hn Huy Dng

Sinh vin thc hin : Phm Xun Lc 20116125

Nguyn Vn Hun 20116155

Mai Vn Khi 20116135

Trn Duy Long 20116137

V Trung Kin 20136923

T Ngc Quang 20136937

I - Tng quan v n p Buck

II - Cu to n p Buck

III - Cch hot ng

IV - M Phng

V - Kt Lun

MC LC

- Buck converter l b bin i m in p u ra nh hn in p u vo hay cn c gi l b bin i gim p ( step-down converter)

B buck converter thng thng iu chnh in p ngun cung cp cht lng cao nh mch ngun my tnh v cc thit b o lng, n cn c s dng iu chnh tc ng c mt chiu bng cch thay i in p phn ng.

u im: - C tn hao t nn hiu sut cao (thng trn 80%)

- n nh cao do phn t iu khin lm vic ch xung

- Th tch v trng lng b ngun nh

Nhc im chnh ca n p xung:

- Phn tch, thit k mch phc tp

- Bc x sng, can nhiu trong di tn s rt rng do cn phi c b lc xung cao tn ng vo ngun v b ngun phi c bc kim loi.

I-TNG QUAN V N P BUCK

II-CU TO N P BUCK

-DCX : Transistor ngt dn lm vic iu ch rng xung ( iu ch xung )

- Control circuit : khi iu khin transistor.

-L : cun cm khng tch ly in nng.

-C : T in tch ly in nng.

-Dsb: Diode san bng dng, gip cho dng in qua L lin tc khi dng in cung cp qua transistor DCX khng lin tc.

-T : Chu k ng ngt.

-Ton : Thi gian ng.

-Toff : Thi gian ngt.

-Vs: Ngun in mt chiu ng vo.Ngun ny c th l mt b

chnh lu, do cn c t in Cv va lc va tip nhn nng lng t ph ti tr v. V b chnh lu khng nhn c dng tr v.

-Mch ny s c ni ngay sau bin p ngun. T s ta c th thy rng mch ny kh n gin.

-Khi transistor dn, ngun in s chy mt cch trc tip n u ra.in p ny cng phi qua cun dy . Khi transistor ngt, dng lu tr trong cun lm cho diode phn cc thun v cho php dng tr v ti.

III-CCH HOT NG1-Giai on 1 : D