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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) |
| 文件頁數(shù)： | 25/36頁 |
| 文件大?。?/td> | 381K |
| 代理商： | AN-15 |
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AN-15
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Enclosure Shielding
Many applications, such as cellular phone battery chargers,
printers, portable computer adapters and chargers, and video
games are packaged in plastic enclosures with no additional
shielding. Conducted and radiated emissions are controlled
with proper selection of EMI filter components, careful
transformer construction, and tight PC layout practices.
Some applications, such as desktop computers and other
information technology equipment, have increased sensitivity
to conducted and radiated emissions and have a conductive
enclosure connected to the AC mains third wire earth ground.
Other applications, including distributed neural networks and
consumer electronic devices such as VCRs and TV set-top
decoders, also have a conductive enclosure but are powered
from 2 wire AC input and have no earth ground connection.
The enclosure forms a conductive shell which intercepts and
returns displacement currents back to the primary circuitry as
shown in Figures 44-46. Practical implementations include
metal enclosures, plastic enclosures with a conductive coatings
on the internal surfaces, stamped and formed metal shapes,
deep drawn cans, and metal foil.
Low-impedance connections
to the shield are important. Long wires, which degrades
performance, must be avoided.
Figure 44 shows a typical 3 wire implementation with the
enclosure shield connected directly to the third wire earth
ground. The enclosure is AC coupled with Y2-capacitor C7
back to primary circuitry. The enclosure is connected to
secondary through low voltage, ceramic capacitor C8 or may be
directly connected depending on the system configuration.
Electrical safety is maintained under single component failure
conditions such as a short circuit failure of C7 or open circuit
failure of the connection to third wire earth ground. The third
wire earth ground connection to the enclosure safely shunts
fault current to provide protection if C7 fails short. C7 safely
limits fault current flow to less than 3.5 mA (IEC950 limit for
three wire, 250 VAC) if the third wire earth ground fails open
circuit.
PI-1657-111695
7.5 V
RTN
C5
47
μ
F
L3
D2
UG8BT
D3
1N4148
R2
68
VR2
1N5995B
6.2 V
C3
120
μ
F
25 V
T1
D1
UF4005
C2
680
μ
F
25 V
VR1
P6KE200
BR1
400 V
C1
33
μ
F
400 V
R1
39
U2
NEC2501-H
U1
TOP202YAI
DRAIN
SOURCE
CONTROL
C4
0.1
μ
F
C7
1.0 nF
Y2
L1
3.3
μ
H
F1
3.15 A
J1
C8
0.1
μ
F
C6
0.1
μ
F
X 2
L2
22 mH
L
N
1
V+
V-
8
2
7
3
4
Figure 44. Typical 3-Wire TOPSwitch Power Supply and EMI Filter with AC Coupled SELV Potential Shielded Enclosure.
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| AN-20 | Transient Suppression Techniques for TOPSwitch Power Supplies |
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