Switching Power Supply Design, X Cap And Y Cap
A：2008-12-18 A：263
Switching power supply capacitor when the design problem is the need to pay attention, and in the switching power supply capacitor design. Y series X series capacitor and capacitor design
Is very important. For each of these two series capacitors design criteria, to explain to everyone here.
X capacitor switching power supply design guidelines:
Reference AD1118 X capacitor placement guidelines:
1 Common Mode Chokes ago: 105/275VAC (MKP/X2) 2. Common mode choke after: 474/275VAC (MKP/X2) Reference MW SP
200-12 X capacitor placement guidelines: 1. Common mode choke coil former: 1uF/275VAC (MKP/X2) 2. Common mode choke after: 0.33uF/275VA
C (MKP/X2)
Reference MW S145-12 X capacitor placement guidelines:
1 Common Mode Chokes ago: 0.22uF/MKP-X2-250VAC/275VAC (GS-L)
(2) Common Mode Choke after: 0.1uF/MKP-X2-250VAC/275VAC (GS-L)
Usually two X capacitors, before a use 0.47uF, the second stage with a 0.1uF; single stage is used 0.47uF. Currently no convenient method of calculating. (Electric
The size and volume capacity of the power supply has no direct relationship)
Y capacitor switching power supply design guidelines:
Earth = PGND (or CHGND) Reference AD1118 Y capacitor placement guidelines:
1 mains input L / N line to the earth: (2 472/250V Y2)
(2) electricity through a common mode choke the earth after two lines: (2 472/250V)
3 low-side output rectifier bridge (primary of the transformer low voltage side) to the earth: (a 222/250V)
4.6 group of low-voltage DC output 88V1 on earth: (each a 103/1KV Y1)
5.6 sets of low output auxiliary power AGND (low voltage transformer secondary side) of the earth: (sharing a 103/1KV Y1)
6 primary of the transformer low voltage side of the transformer secondary low-voltage side: (sharing a 103/1kV Y1)
Reference AD1043 design:
1 mains input L / N line to the earth: (2 222/250V Y2)
(2) electricity through a common mode choke the earth after two lines: (2 472/250V Y2)
Kang special reference to electronic design:
1 mains input L / N line to the earth: (2 102/250V Y2)
(2) electricity through two common mode choke the earth after two lines: (2 102/250V Y2)
3 low-side output rectifier bridge (primary of the transformer low voltage side) to the earth: (a 332/250V Y2)
4.12V low voltage DC output to the earth: (1 223/1KV DISC Y1)
5 primary of the transformer low voltage side of the transformer secondary low-voltage side: (222/250V Y1)
Reference MW S-145-12 Design:
1 electricity through a common mode choke the earth after two lines: (2 222/2kV Y1)
(2) low-voltage rectifier bridge output terminal (primary of the transformer low voltage side) to the earth: (1 222/2kV Y1)
3.12V low voltage DC output GND on earth: (1 103/1KV Y1)
Reference MW S-200-12 Design:
1 mains input L / N line to the earth: (two 472/250V Y2 is not on)
(2) electricity through a common mode choke the earth after two lines: (2 472/250V Y2)
3 low-side output rectifier bridge (primary of the transformer low voltage side) to the earth: (a 222/250V Y2)
4.PFC output high side of the transformer primary ground: (1 103/2kV Y1)
5.12V low voltage DC output to the earth: (1 103/1KV Y1) 6.12V low voltage DC output GND on earth: (1 203/1KV Y1)
According to the above description, Y capacitor design rules are as follows: (can be appropriately selected)
1 mains input L / N line to the earth: (2 222/250V Y2)
(2) electricity through a common mode choke the earth after two lines: (2 222/250V Y2)
3 low-side output rectifier bridge (primary of the transformer low voltage side) to the earth: (a 222/250V Y2)
4 primary of the transformer low voltage side of the transformer secondary low-voltage side: (Shared a 103/1kV Y1)
4 DC output on the low pressure side of the earth: (1 103/1KV) 6. Voltage output side GND to the earth: (1 103/1KV)
.jpg)