10.3.1 Bridge Rectifier and Capacitance
Filter Circuit 电容
电容
充电
放电
D4
D1
+
~
u
D3
D2
C
RL
+
uo= uc
uO u
2U 2U
o
2
t
O
2
t
10.3.1 Bridge Rectifier and Capacitance
Filter Circuit 电容
Transformer Rectifier Filter Regulator
AC Power
Load
u
u
u
u
u
O
tO
tO
tO
tO
t
Chapter 10 DC Power Supply
10.1 Block Diagram of DC Power Supply 10.2 Rectifier Circuit 10.3 Filter Circuit
1
U
ID(AV)
2IO(AV)
0.45 RL
Peak inverse voltage of Diode
IF
1.1 IO(AV ) 2
UDRmax 2U
UR 1.1 2U
Brachylogy of Bridge Rectifier
+
D4
~
u
D3
D1
io
+
RL uo
D2
+
~
u
io
+ RL uo
整流桥堆
10.2 Rectifier Circuit
1st Single phase half-wave rectifier Circuit 2st Single Phase bridge rectifier Circuit
1 single phase half-wave rectifier
u
D
io
u 2U sin t
-
~ Tr
u
＋
+
RL
uｏ
–
O
2
3
t
uO
UO
1 2
0
2U sin td(t)
O
t
0.45U
iD= iO
ID
IO
0.45
U RL
UO
t
2U
2．Performance Parameter of half-wave Rectifier
① Output Voltage Average
S UO1M 1.57
UO( AV )
3．Rectifying Diode Choosing
D
io
+
~ Tr
u
RL
uｏ
–
Average forward Current of rectifying Diode
U
ID(AV)
IO(AV)
0.45 RL
IF 1.1IO(AV)
Peak inverse Voltage of rectifying Diode
D1
io
+
RL uo
D2
UDRmax 2U
2 Performance Parameter u 2U
–+
o
＋
－
uO
2U
–+ Output Voltage Average
o Im iO
UO (A V ) 10 2Usin(t)d(t)
o uD
o
2 3 t
2 3 t 2 3 t 2 3 t
0.9U
2U uD2 uD1 uD4 uD3
2 Performance Parameter u 2U o
2 3 t
uO
2U
Load Current Average
IO(AV)
UO(AV) RL
0.9U
RL
Ripple factor of output voltage
o iO
2
3
t
Im
o uD
2
3 t
o
2 3 t
S 2 0.67 3
2U uD2 uD1 uD4 uD3
3 Rectifying Diode Choosing in Bridge rectifier
io
Im iO
o uD
o
2 t 2 t
Average forward Current of diode
2U
uD2 uD1 uD4 uD3
把四只二极管封装在一起
~~
+
~
u
RL
Chapter 10 DC Power Supply
10.1 Block Diagram of DC Power Supply 10.2 Rectifier Circuit 10.3 Filter Circuit
10.3 Filter Circuit
• Capacitance Filter Circuit • Inductance Filter Circuit • Compound Filter Circuit
电容
充电
放电
D4
D1
+
~
u
D3
D2
C
RL
+
uo= uc
2 Performance Parameters of BR CF
Output Voltage Average UO(AV)
U O (A V)U O m axU O m ax2 U O m in
UO(AV)
UOmaxUOmin 2
Single phase bridge Rectifier
最常用的整流电路 由四个二极管 构成
D4
+
~
u
D3
D1
io
+
RL uo
D2
1. Working Principle
+ D4
+
~
u
–
D3
D1
io
+
uo
RL
D2
UDRmax 2U
1. Working Principle：
+
–
D4
+
~
u
D3
UDRmax 2U
URM 1.1 2U
4．Half-wave Rectifier Circuit Summary
D
io
+
~ Tr
u
RL
uｏ
–
优点：结构简单，所用二极管数量少 缺点：脉动系数大，直流成分低，电源利
用效率低
10.2 Rectifier Circuit
1st Single phase half-wave rectifier Circuit 2st Single Phase bridge rectifier Circuit
UO(AV) 0.45U
② Load Current Average
IO(AV)
0.45
U RL
D
io
+
~ Tr
u
RL
uｏ
–
用来描述输出电 压整中流，输交出流电分压量的与基直波 流峰分值量U的O1比M 例与关输系出，电 从压而平对均整值流UO输（出AV）电之压比
给予评价
③ Ripple factor of output voltage
Chapter 10 DC Power Supply
Chapter 10 DC Power Supply
10.1 Block Diagram of DC Power Supply 10.2 Rectifier Circuit 10.3 Filter Circuit
10.1 Block Diagram of DC Power Supply