BỘ CÔNG THƯƠNG
TRƯỜNG ĐẠI HỌC CÔNG NGHIỆP TP. HCM
KHOA CÔNG NGHỆ ĐIỆN TỬ
ĐỒ ÁN 1
MẠCH NGUỒN XUNG UC3842
Giảng viên hướng dẫn : Th.s MÃ DUY KHANH
Sinh viên thực hiện: NGUYỄN HOÀNG ANH_08179231
NGUYỄN VĂN HUY_08160901
PHAN BẢO QUÂN_08177711
Lớp: NCDT2A
Niên khoá: 2008 - 2011
TP. Hồ Chí Minh, tháng 11 năm 2010
Lời nói đầu

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 !"####$%&' ()*+,
-.*/01*"23
4567-#8/91!:8&';<
(0="
2#>%)?@"A(B>%
8)+#+C(8D@E$,#F
+#F(#(B>%GFHI"JK(8&
+#+C4(0F<;9"
L*(+G>%/94 +1#M+NC
(M8*#+-"O#+C*)M+(B
%(8%/9!K%(*45+##G
=,#8*K%-"
LB='H6%8)B#F0)>%
!P(Q!RSTU(8(<07Q%V(BWB>%XYZ[\

J7Q%&1]$EI+^2M_1'(

*'`7Q:8;<"^7Q%1]2$
_#a7b(*'`,1<V7Q:8 >
"
J5c%.1]dM_7.7Q 
>"
 !
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I.

CÁCH HOẠT ĐỘNG VÀ Ý NGHĨA CỦA UC3842 VÀ TL 431

II.

TÍNH TOÁN CHO CÁC LINH KIỆN TRONG MẠCH:

1. Khối nguồn:
2. Các thành phần trong khối nguồn:
a. Mạch lọc nhiễu 4
b. Mạch chỉnh lưu 4
c. Mạch dao động 4
d. Đèn công suất 4
e. Mạch hồi tiếp 4
f. Biến áp xung
3. Tính toán cho khối nguồn: 4
a. Khối nguồn:

b. Tính toán giá trị cho tụ lọc nguồn và chọn dải điện áp cho ngõ vào
c. Tính toán cho Mosfet : 13
d. Tính toán giá trị cho mạch Snubber 15
e. Tính toán cho cuộn biến áp xung : 17
f. Mạch hồi tiếp so quang: 25
g. Mạch lọc nhiễu cao tần: 26
h. Mạch chỉnh lưu và lọc điện áp AC 220V thành DC 300V: 27
i. Điện trở mồi và mạch cấp nguồn cho IC 27
j. Mạch bảo vệ quá dòng: 28
k. Mạch bảo vệ quá áp: 29
III.HÌNH ẢNH CÁC KHỐI NGUỒN TRÊN THỰC TẾ 30
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^*)('/veT6k'Q|D
^('/k'Q,-)D
LEvveI*)PEwI'/86k'Q"
L;k'Q-.1[(*EIH>*)D
&P)M,&MMY/)O
2#45 1h

E16!I-.=D
min 2
max
( . )
2
DC
m
in s RF

V D
L
P f K
=
}
4
D$45#36
O
vw
D4#-4#
‘^5(*!'`+0HE'4F4'F'QDkJeI8
RF
K
~G"
‘^5(*!'`0HEF4'F'QDJJeI8
RF
K
„G"
2;
RF
K
~f"Xf"qC|(?EYqL[€qL4I
RF
K
~f"Zf"Y
C|(EGŒqL’[€qL4I
h-;4'/0e4}Q*)D
peak
ds
I

D'/, 0e4}Q"
RMS
ds
I
D'/'H0e4}Q"
2#=ŠL'*)+!JJe#1D
1
1 1
2
CCM
DC
RO
m s in
V
V
L f P
−
 
= −
 ÷
 ÷
 
J;4)(('/P'4e4}Q
L*'/P'4%-.HPL8;e4}Q(*'/:16e4}QP
(Q*]P'4EQ+I"L*445P(QG[“>‚:&
4)6e4}Q4c-"
UP)M,H*,)LR&M.0&ZQQ/L
Oe4}Q38#G+6'/ 10&'6e4(#
e4@(8(<$#4Q1(e4"
k'Q'`'//0H'//(#"

^$F0+4Q(*0H4Q(9)
(B+#1";L44)64Q+(9)(+#
1D
L40H4Q)*]LvfL4~[”["qLvf"AL4:94z
'`4Q('H"
^.4Qc-(*4)@=' 04))"
^!9)6H4QD
}4$4564•qGf“"
 L*+QJJe'/'(0H4Q18|(
C"A0H4Q-Š
L*JJe8
L*kJe8
2yL4[^*)0e4
J/''Q8;R}4''Q(*'/Gr
/P)M,&M&[Q*\,J]HD
^]0!4])D
2w+#[!(D!'`0HEF4'F
'QJJeI(+0HE'4F4'F'Q’kJeI"e•B#
M-06#"
kJeD)B+k'Q,5]+K*
9]04 ŠMC-4zK]JJe"201&kJe'/
veT]"kJe-'cM#|'/
)"2+#JJe'c)'/"^y|(|JJe
8H!(8(/kJe+,H!(8(
/H!(1"
2#=4D
min
max
max
.

1
RO DC
D
V V
D
=
−
maxnom
ds DC RO
V V V= +
RO
V
D!4])
2;k
%
4*)#8B;k
%
' (
nom
ds
V

nom
ds
V
)€qƒf“,6e4}Q"2-e4}Q€qfL
8k
%
)+1f"Zq”f"q0k
%

9]f"q5(*!JJe"
e!458'%D
+GD