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Noise Suppression 噪声抑制

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标签： Noise

Noise

噪声抑制相关的外文技术文档

Note
• Please read rating and
CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc.
• This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
C35E.pdf September.5,2013
Noise Suppression by
EMIFIL
®
Application Guide
Application Manual
Murata
Manufacturing Co., Ltd.
Cat.No.C35E-2
Note
• Please read rating and
CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc.
• This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
C35E.pdf September.5,2013
Introduction
To make effective noise suppression in electronic
equipment it is necessary for design engineers to have a
good understanding of the various types of EMI
suppression filters available and the characteristics so
that they can use suitable components.
Because filtering characteristics of EMI suppression
filters depend significantly on the construction, a wide
variety of products are available in the market, it is
difficult to understand all of them.
This brochure provides an overview of EMI suppression
filters by classifying them into several groups and
describing the characteristics of each group along with a
brief summary for the engineers.
This publication is intended to help readers to make
correct selection of EMI suppression filters for their
applications.
Definition
DC EMI suppression filters : EMI filters to be used in
the secondary side DC circuits such as digital circuits,
audio and video circuits.
* EMIFIL
®
and EMIGUARD
®
are the registered
trademarks of Murata Manufacturing Co., Ltd.
Note
• Please read rating and
CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc.
• This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
C35E.pdf September.5,2013
1
Example of Noise Suppression in Desktop PCs
̶̶̶
2
Noise Emission Status
...................................................................
02
Noise Suppression Content in Personal Computers
...................
03
Improving Shielding
......................................................................
04
Installing EMI filters on Interface Cable Ports
...............................
04
Example of effects produced when improving the GND and installing EMI filters on the cable connector port
.. 5
Improving the GND on Extension Boards
....................................
06
Installing EMI filters on the Clock Lines
.........................................
06
Installing EMI filters on Bus Lines
..................................................
06
CONTENTS
2
Example of Noise Suppression in Notebook PCs
̶̶
7
Noise Emission Status
...................................................................
07
Noise Suppression Content in Notebook Personal Computers
.......
08
Improving the Case Shielding and GND Connection
...................
09
Improving the External Card GND
................................................
09
EMI Filter at LVDS Cable Connection
............................................
09
Noise Suppression in LCD
............................................................ 10
Installing EMI filters on Interface Cable Ports
............................... 10
Installing EMI Filters on the DC Power Supply Input
..................... 10
Noise Suppression Content for USB
............................................. 12
Examples of transmission signal waveforms and noise suppressing effects in HS mode
.. 13
Noise Emission Status
................................................................... 14
Noise Suppression Content in CD-ROM Drives
............................ 15
Installing EMI Filters on the Headphone Output Port
.................... 16
Installing EMI filters on the Clock Line
.......................................... 16
Installing EMI filters on Bus Lines
.................................................. 16
Example of effects produced when installing the Chip Ferrite Bead on the bus lines
17
Installing EMI filters on Interface Cable Ports
............................... 18
1
2
3
4
5
6
7
8
9
10
Example of Noise
Suppression in Desktop PCs
Example of Noise Suppression
in Notebook PCs
Example of Noise
Suppression for USB's
Example of Noise Suppression
in CD-ROM Drives
Example of Noise
Suppression in DVD Players
Example of Noise
Suppression in Printers
Example of Noise
Suppression in Fax Machines
Example of Noise Suppression
for Car Navigators
Example of Noise Suppression
in AC Power Supplies
Example of Noise Suppression
in Mobile Phones
3
Example of Noise Suppression for USB's
̶̶̶̶̶̶
11
4
Example of Noise Suppression in CD-ROM Drives
̶̶14
5
Example of Noise Suppression in DVD Players
̶̶
19
Noise Emission Status
................................................................... 19
Noise Suppression Content in DVD Players
................................. 20
Improving the Shielding
................................................................ 21
Installing EMI filters on Interface Cable Ports
............................... 21
Installing EMI filters on the Clock Line
.......................................... 21
Installing EMI Filters on Bus Lines
................................................. 22
Installing EMI Filters on High-speed Bus Lines
............................. 22
6
Example of Noise Suppression in Printers
̶̶̶̶̶
23
Noise Emission Status
................................................................... 23
Noise Suppression Content in Printers
......................................... 24
Improving the GND
....................................................................... 25
Installing EMI filters on Motor Control Lines
.................................. 25
Installing EMI filters on the Parallel Interface
................................ 25
Installing EMI filters on the DC Power Supply Input and Lines
..... 25
Installing EMI filters on the Clock Line
.......................................... 26
Example of effects produced when installing EMI filters on the Clock lines
. 26
Installing EMI filters on Bus Lines
.................................................. 27
28
Noise Emission Status
................................................................... 28
Noise Suppression Content in Fax Machines
............................... 29
Installing EMI filters on Interface Cable Ports
............................... 30
Installing EMI filters on the DC Power Supply Input and Lines
..... 30
Installing EMI filters on Signal Lines to the Handset
..................... 30
Installing EMI filters on the Clock Line
.......................................... 30
Example of effects produced when installing EMI filters on the Clock lines
. 31
Installing EMI filters on Bus Lines
.................................................. 31
Noise Emission Status
................................................................... 32
Noise Suppression Content in Car Navigators
............................. 33
Improving the Shielding
................................................................ 34
Installing EMI filters on Interface Cable Ports
............................... 34
Example of effects produced when installing EMI filters on Interface Cable Ports
. 35
Installing EMI filters on the Clock Lines
......................................... 36
Installing EMI filters on Bus Lines
.................................................. 36
7
Example of Noise Suppression in Fax Machines
̶
8
Example of Noise Suppression for Car Navigators
̶
32
9
Example of Noise Suppression in AC Power Supplies
̶
37
Noise Emission Status for Switching Power Supplies
................ 37
Noise Suppression Model for Ordinary Switching Power Supplies
.... 38
Differential Mode Noise and Common Mode Noise
...................... 39
Functions of Respective Noise Filters
........................................... 40
Noise Tendencies in Switching Power Supplies
............................ 41
Examples of Suppression against Strong Differential Mode Noise
... 42
Reasons Why Common Mode Choke Coils Contain Mode Inductance
... 43
Effective Suppression Methods against Differential Mode Noise using Hybrid Choke Coils
... 44
Examples of Confirming the Effectiveness of Hybrid Choke Coils
... 45
Noise Emission Status
................................................................... 46
Noise Suppression content in Mobile Phones
.............................. 47
Installing EMI filters on LCD line
.................................................... 48
Installing EMI filters on DC Power Supply
..................................... 48
Installing EMI filters on Data Line
.................................................. 48
Installing EMI filters on interface section
....................................... 49
Improving the Shielding
................................................................ 49
10
Example of Noise Suppression in Mobile Phones
̶
46
Note
• Please read rating and
CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc.
• This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
C35E.pdf September.5,2013
1
Example of Noise Suppression in Desktop PCs
Noise Emission Status :
Noise is emitted from the cables connected to a personal computer.
When using a computer case that does not have efficient
shielding, radiated noise from the computer body may
sometimes cause problems.
1
Extension card
Back side of PC
Power supply USB Mouse Keyboard Display
cable
Conducted noise
Radiated noise
2
Note
• Please read rating and
CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc.
• This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
C35E.pdf September.5,2013
Example of Noise Suppression in Desktop PCs
1
Noise Suppression Content in Personal Computers
A PC contains many sources of noise inside and out,
with many connected cables. Therefore, it is necessary to
use EMI filters on the interface cables, in addition to
shielding and improving GND connections.
The PCB incorporates many signal lines that contain
high-level noise. The EMI filters should also be mounted
on potential noise sources such as the clock line, bus
line and DC power supply line, to suppress noise
conduction to the cable.
1
EMI filters on PC power supply line
Chip Ferrite Bead
BLM
P Series
EMI filters on the clock line
Chip EMIFIL
®
for signal lines
NFW31S Series
EMI filters on bus line
Chip Ferrite Bead
BLM Series
Chip EMIFIL
®
NFM21C Series
NFR21G Series
Chip EMIFIL
®
for DC power
supply circuits
NFM21P Series
Chip Ferrite Bead
BLM Series
NFR21G Series
Shielding
Metal case
shielding
CD-ROM
CPU
M
RO
M
Improving shielding
Upper and lower
covers of metal case
are connected
together with fingers
or gaskets.
Gate
Array
Power
Supply
Driver
Driver
Driver
USB
Chip Set
RA
EMI filters on USB line
Mouse Keyboard
Display
USB
EMI filters on interface ports
Chip Ferrite Bead
BLM Series
Improved GND
PCB GND and
metal case are
screwed together.
Improved GND on
extension board
connector
Extension board's
GND and metal case
are connected together
with metal fittings.
Chip Ferrite Bead
BLM15BB121SN1
Chip Common Mode Choke Coil
DLP11SN900HL2
Chip EMIFIL
®
NFM21C Series
Chip Ferrite Bead for DC power
supply circuits
BLM15PG Series
Chip EMIFIL
®
for signal lines
NFW31S Series
3
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