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Switching Power Supply Design, X Cap And Y Cap
Add time:2008-12-18    Click: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)

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