參數(shù)資料
型號(hào)： AN-15
英文描述： TOPSwitch Power Supply Design Techniques for EMI & Safety
中文描述： 的TOPSwitch電源電磁干擾設(shè)計(jì)技術(shù)
文件頁(yè)數(shù)： 12/36頁(yè)
文件大小： 381K
代理商： AN-15
AN-15
A
6/96
12
Common mode inductance of each winding is the measured
inductance of one winding with the other winding open circuited.
Differential mode inductance of each winding is equal to half
the measured inductance of one winding with the other winding
short circuited.
Common mode impedance is shown for the U-core style in
Figure 23 and the spool style in Figure 24. Also shown is
common mode impedance for a typical toroidal implementation.
Note that the toroidal common mode impedance is generally
lower than both the U-core and spool style common mode
chokes.
0.8
13.0±0.5
21.0±1.0
10.0±0.5
16.0±1.0
2
3
PI-1635-111695
Figure 21. Spool Wound Common Mode Choke (All dimension in
mm).
Figure 22. Effective Common Mode Choke Schematic.
Common Mode
Inductance
Input
Output
Differential Mode
"Leakage"
Inductance
PI-1636-111695
Differential mode impedance is shown for the U-core style in
Figure 25 and the spool style in Figure 26. Also shown is
differential mode impedance for a typical toroidal
implementation. Note that the toroidal differential mode
impedance is quite a bit lower than both the U-core and spool
style common mode choke. With toroidal common mode
chokes, additional differential mode chokes are usually required.
For these reasons, toroidal common mode chokes are not
recommended except for the high frequency, supplemental
torodial common mode choke described below.
Figure 23. U Core Common Mode Choke (Common Mode
Impedance).
I
(
)
Frequency (Hz)
1K
1M
100K
10K
10
1K
100
1
10K
100K
1M
10M
40M
33 mH
10 mH
Toroid
1mH
P
One very important advantage to the bobbin style common
mode choke is an “inherent differential mode choke” due to
parasitic leakage inductance which usually eliminates any need
for additional discrete differential mode chokes. Figure 22
shows the effective common mode choke schematic consisting
of a common mode inductance in series with an effective
differential mode leakage inductance. Unlike most other
magnetic components, leakage inductance in a common mode
choke is a desirable parasitic effect which provides balanced
differential mode filtering for no additional component cost.
The common mode choke is modeled by a common mode
inductance in series with a differential mode inductance.
I
(
)
Frequency (Hz)
1K
1M
100K
10K
10
1K
100
1
10K
100K
1M
10M
40M
33 mH
22 mH
0.82 mH
Toroid
1mH
P
Figure 24. Spool Wound Common Mode Choke (Common Mode
Impedance).
相關(guān)PDF資料
PDF描述
AN-16 TOPSwitch Flyback Design Methodology
AN-17 Flyback Transformer Design for TOPSwitch Power Supplies
AN-18 TOPSwitch Flyback Transformer Construction Guide
AN-19 TOPSwitch Flyback Power Supply Efficiency
AN-20 Transient Suppression Techniques for TOPSwitch Power Supplies
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