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8/19/2019 EMI-EMC for Beginners
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Analog Devices Confidential Information—not for external distribution
ESD, EFT, Surge and EMC
Beginners GuidePart-1
► Anoop K
mailto:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]
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Analog Devices Confidential Information
Agenda
►EMC and key terms
►ESD,EFT and Surge
►EMC-4 compliant RS485 Network for different cost/performance critera
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Analog Devices Confidential Information
Electromagnetic Compatibility
►EMC (electromagnetic compatibility)
►EMI (electromagnetic interference)
►Emission Issues
►Susceptibility/Immunity Issues
………EMC is the contr ol of EMI so that unwanted effects are prev
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Analog Devices Confidential Information
Overview of EMC test standards…
►Immunity & Susceptibility Testing
Scope EN Standard IEC Standards
Burst/Electrical Fast Transient EN 61000-4-4 IEC 801-4;
IEC 61000-4-4
Conducted Continuous Disturbances from DC to 150 kHz EN 61000-4-16 IEC 61000-4-16
Conducted Disturbances Induced by RF Fields EN 61000-4-6 IEC 61000-4-6
Electrostatic Discharge EN 61000-4-2 IEC 61000-4-2
Generic Immunity - Industrial Environment EN 61000-6-2 IEC 61000-6-2
Generic Immunity - Residential, Commercial & Light Industry EN 61000-6-1 IEC 61000-6-1
Magnetic Field, Damped Oscillatory EN 61000-4-10 IEC 61000-4-10
Magnetic Field, Oscillatory EN 61000-4-12 IEC 61000-4-12
Magnetic Field, Power Frequency EN 61000-4-8 IEC 61000-4-8
Magnetic Field, Pulse EN 61000-4-9 IEC 61000-4-9
Radiated RF Electromagnetic Field EN 61000-4-3 IEC 61000-4-3
Surge EN 61000-4-5 EN 61000-4-5
Voltage Dips, Short Interruptions and Voltage Variations EN 61000-4-11 IEC 61000-4-11
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Analog Devices Confidential Information
EMC Characterization Continued…
►Electromagnetic Emission TestingScope Country
Radio Frequency Devices US FCC Pa
Industrial, Scientific, and Medical Equipment US FCC Pa
Food and Drug Administration Reviewer Guideance for Pre-market Notification Submissions US FDA
Industrial, Scientific and Medical (ISM) Radio Frequency Equipment EU EN 550
Broadcast Receivers and Associated Equipment
Generic Emissions - Residential, Commercial, Light Industrial Int'l/EU IEC 610
Generic Emissions - Industrial Int'l/EU IEC 610
Electrical Motor-Operated and Thermal Appliances for Household and Similar Purposes, Electric
Tools and Similar Electric Apparatus
EU EN 550
Information Technology Equipment EU EN 550
Harmonic Current Emissions (usually done with Voltage Fluctuations, EN 61000-3-3) EU EN 610
Information Technology Equipment Australia, New Zealand AS/NZS
Information Technology Equipment Japan VCCI
BSMI Taiwan CNS 13
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Analog Devices Confidential Information
Benefits of Good EMC design …
►
Safety
►Reduction in expense
►Increased reliability
►Legality
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Analog Devices Confidential Information
Electrostatic Discharge (ESD)…
►Caused by Static Electric Charge
Electrostatic Induction
Triboelectric charging
►Effects
Harmful effects in industries Eg:Oil/Gas etc..
Reliability issue, Life time issues, performance issues etc..
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Analog Devices Confidential Information
ESD Continued…
►Damage Prevention in Electronics
Implementation of Electrostatic Discharge Prevented Area (EPA)
ESD protection during transit
Integration of ESD protection to the device (system/part)
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Analog Devices Confidential Information
ESD Continued…
ESD Association Handbook• Human Body Model(HBM)
• Charged Device Model (CDM)
IEC 61000-4-2
• International ESD immunity Test Standard
Note: ESD compliance is done both system level and device level.
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Analog Devices Confidential Information
IEC 61000-4-2 International Standard:
Contact Discharge
• Direct Contact Transfer Between Two Objects at Differen
Air Discharge
•
A High Electrostatic Field between Two Objects when TheClose Proximity
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Analog Devices Confidential Information
IEC 61000-4-2 International Standard:
Table: Overv iew of Threat Levels
LevelTest Voltage (ContactDischarge)
Test Voltage (Air Discharge)
12kV 2kV
24kV 4kV
36kV 8kV
48kV 15kV
Note: The test set up does con sider the relat ive humidi ty as wel l as the
mater ials used whi le cond uct ing the test
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Analog Devices Confidential Information
IEC 61000-4-2 International Standard:
►Discharge (ESD) Current Waveform
Severit y Levels and Test Volt ages
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Analog Devices Confidential Information
IEC 61000-4-2 International Standard:
►EUT Test Setup
Typic al ESD Test Setup
Test Results
• Normal operation with
specification
• Temporary degradation orwhich is recovered byself-r
• Temporary degradation oror function, which is recintervention or systemreset
• Damage of the systemunrecoverable degradatiofunctionor data
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Analog Devices Confidential Information
Electrical Fast Transient (EFT)
►Generated as result of gaseous discharge
►EFT is applicable to both power and data lines
► IEC 61000-4-4 International EFT Immunity Test
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Analog Devices Confidential Information
IEC 61000-4-4 International Standard
EFT Test Waveform
IEC 61000-4-4 Test Lev el
Test
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Analog Devices Confidential Information
Surge
►Overvoltage from switching / lightning transients
Power System Switching Transients
Lightning Transients
►
IEC 61000-4-5/EN61000-4-5
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Analog Devices Confidential Information
IEC 61000-4-4 International Standard
IEC 61000-4-5 Voltage Imp ul se
IEC 61000-4-5 Curren t Impu lse Test Setup
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Analog Devices Confidential Information
Theory of Protection
►Suppress the transient at source
►Make the coupling path inefficient
►Make the device less susceptible to the transient
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Analog Devices Confidential Information
Typical Protection Scheme
Types:
►Over current protec
►Over voltage prote
Characteristics:
►Primary
► Secondary
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Analog Devices Confidential Information
ESD,EFT and Surge Protection Devices
►Mapping of the Dynamic behavior with target device
TVS
Types:
►Unidirectional
►Bidirectional
Characteristics:
►Clamping
►Low dynamic resis
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Analog Devices Confidential Information
ESD,EFT and Surge Protection Devices
TSPD
Types:
►Unidirectional
►Bidirectional
Characteristics:
►Crowbar device
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Analog Devices Confidential Information
ESD,EFT and Surge Protection Devices
GDT
Types:
►Unidirectional
►Bidirectional
Characteristics:
►Crowbar
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Analog Devices Confidential Information
EMC Compliant RS485 Communication Port
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Analog Devices Confidential Information
Protection Scheme-1
Protection Level
Bidirectional TVS array CDS
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Analog Devices Confidential Information
Protection Scheme-2
Bidirectional TVS array C
TBU-CA065-200-WH
TISP4240M3BJR-S
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Analog Devices Confidential Information
Protection Scheme-3
Bidirectional TVS array CD
TBU-CA065-200-WH
TISP4240M3BJR-S
2038-15-SM-RPLF
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Analog Devices Confidential Information
Layout & Placement
►Locate the protectio
the bus connector
► Avoid stubs connec
Certified EMC Compliance for RS-485
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Analog Devices Confidential Information
Certified EMC Compliance for RS 485
Three Protection Circuits at Different Cost Points
R
D
B
A
RxD
TxD
GND
VCC
B
A
ESD
IEC61000-4-2
EFT
IEC61000-4-4
Su
IEC61
8kV Contact15kV Air
2kV >
8kV Contact15kV Air 2kV > 4
8kV Contact15kV Air
2kV > 6
* Surge rating depends on location of equipment,
Exterior, higher level application specification
R
D
B
A
RxD
TxD
GND
VCC
B
A
R
D
B
A
RxD
TxD
GND
VCC
B
A
► EVAL-CN0313-SDPZ Contains ADI RS-485 Transceivers
Bourns Exte rnal Protection Compo
A l D i d EMC
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Analog Devices Confidential Information
Analog Devices and EMC..
►Components with integrated
ESD Protection Overvoltage Protection
EMI Filters
►Reference Designs Complying to EMC Standards
ADA4177-x – ADA4077 with ±32V OVP and EMI
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Analog Devices Confidential Information
Input OVP
Input
Voltage
(±42V)
OutputVoltage
(±15V)
PowerSupplies
(±15V)
32V > Power
Supply
32V < Power
Supply
Key Features and Benefits
Input OVP and EMI Filters
Protects the inputs from damage
Easier to pass EMI susceptibility testing Improves Time-to-Market
Improves system precision (to 50X)
Simplifies system design
Reduces BOM costs and PCB footprint
Rail-to-Rail Output improves dynamic range by 7%
Applications
Front end amplifier for standardized sensor input in Process
Control Instrumentation front ends
Motor control current sense
VOS Offset Drift Ib Noise Isy Max Bandwidth Op. Vo
60 µV Max 1 µV/C Max 1 nA Max 8 nV/√Hz 620 µA 3.5 MHz ±2.5 V –
Integrated Input OVP and EMI filters
No Phase Reversal,
Oscillation, or Damage
R
Vout
EMI Filtered
Op Amp
¬Vos
¬V
¬V¬Vos
GND®
GND®
Vout
UnfilteredOp Amp
Input
20dB Lower EMI
O V lt P t ti Di t I t t d
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Analog Devices Confidential Information
Over-Voltage Protection – Discrete versus Integrated
D1/D2 ROVP
Reference: Analog Dialogue Volume 46, February 2012, “Robust Amplifiers Provide Integrated Overvoltage Protection”
http://www.analog.com/library/analogdialogue/archives/46-02/ovp.html
VCC
VEE
VIN
ESD
OVP
ESD (HBM) >4kV
JFET
>2kV
40VBreakdown
CurrentLimiting FET
External Solution Integrated Solution
Typical Op
Amp
ADA4177-2
5k
BAS70-4-V
5k
ADA4096-x – 36V OPX96 Performance
http://www.analog.com/library/analogdialogue/archives/46-02/ovp.htmlhttp://www.analog.com/library/analogdialogue/archives/46-02/ovp.html
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Analog Devices Confidential Information
36V, RRIO, Precision, µPower, RRIO Op Amp with OVP
Key Features
Internal Input Over Voltage Protection (OVP)
Up to ±32V beyond the Rails
Characterized OVP Parametric Impact
(compared to external OVP solutions)Low Power: 60 µA typical
Unity GBW: 800 kHz at Vsy = ±15V typical550 kHz at Vsy = ±5V typical475 kHz at Vsy = ±1.5V typical
Low Offset Voltage: 35 µV typical
Applications
Process Control (PLC/DSC)
Battery Monitoring and Current Shunt Sensing
Sensor Conditioning
Portable Instrumentation
Wireless Base Stations
Isy GBW Vos Vos Drift Noise IB Vo
75 A max 800 kHz typ 300 V max 1 V/°C typ 27 nV/Hz typ 10 nA max 3 V
PLC Evaluation Board with EMC
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Analog Devices Confidential Information
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Analog Devices Confidential Information
Thank You