Download - PFC and EMI filtering - FHI
![Page 1: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/1.jpg)
PFC and EMI filtering
Alex Snijder
Field Application Engineer
Wurth Elektronik Nederland B.V.
November 2017
![Page 2: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/2.jpg)
2Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
EMC Standards
Power Factor Correction
Conducted emissions
Radiated emissions
![Page 3: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/3.jpg)
3Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Overview of standard covering SMPS
CISPR11, EN55011 for industrial, medical, scientific applications
CISPR13, EN55013 for consumer applications
CISPR14, EN55014 for home appliances, power tools,
CISPR15, EN55015 for lighting equipment
CISPR22, EN55022 for computing applications
30MHz 1GHzFrequency (MHz)-30
100 dBµV/m
0
![Page 4: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/4.jpg)
4Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Low Frequency Conducted EMC (CISPR15)
62kHz+6dB
![Page 5: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/5.jpg)
5Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
LED Driver
![Page 6: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/6.jpg)
6Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
PFC/ Harmonic standard EN61000-3-2
To avoid reactive power on power network, a PFC circuit is needed with most switch mode power solutions
It is required by law
Used for electrical regulated Loads
– Switching power supplies
– Electronic Engine regulation
– Lighting dimmer
Problems of high peak current
Peak current of the loads occur
at the same time
occur nearly at the voltage peak
![Page 7: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/7.jpg)
7Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
EN61000-3-2 Classes
Class A
– 3-phase devices
– White goods
– All devices which are not mentioned
in other Classes
Class B
– Portable Tools
Class C
– Lighting equipment
• PF requirement also for small power
Class D
– PC
– Screen
– TV- Radio equipment with input power of < 600W
![Page 8: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/8.jpg)
8Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
What is PFC and what does a PFC (choke) do?
What does PFC mean?PFC means “power factor correction”
PFC choke forms the input current
in phase to the mains voltage
Why PFC?
To avoid reactive power
which have to be provided by energy providers
Reactive
power
Active power
Source: www.Renesas.eu
![Page 9: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/9.jpg)
9Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Passive PFC
Passive PFC
– Choke and Cap. (Low-Pass-Filter)
Advantage:
– Cost effective (Component)
Disadvantage:
– Required too much space on PCB
– Power Factor between 0,7 -0,8
typical characteristic on the PCB
big toroidal core at the input
Passive
![Page 10: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/10.jpg)
10Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Active PFC
• Active PFC
– Choke with Bias winding for the IC
( not for all a Bias winding )
– Controlled by an IC
Advantage:
– Required less space on PCB
– Power Factor close to 1
– Universal input regulation
– Better EMI compatibility
Disadvantage:
– Cost intensive
Active
![Page 11: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/11.jpg)
11Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Different PFC Solutions
Input Characteristics of PC Power Supplies with PFC Types
( None, Passive and Active )Source: www.onsemi.com/pub_link/Collateral/HBD853-D.PDF
![Page 12: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/12.jpg)
12Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
WE Standard PFC parts
RM series
– Small footprint
– Good EMC behaviour due toshielded and grounded core
– Low proximity losses due to litzwire
EFD series
– Flat design
– Low proximity losses due to litzwire
![Page 13: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/13.jpg)
13Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Common Mode noise
L1
N
PE
Parasitic capacities
e.g.: collector to cooling element
13
2
cmI
2
cmI
dmI
cmI
![Page 14: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/14.jpg)
14Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Differential mode calculation example
L1
N
PE
14
dmI
Ω=
=
=
=
mESR
Khz
Duty
AI
50
150F
50%Cycle
2
sw
Check 55022 ClassB standard @ 150Khz : Allowed 66 dBµV = 2mV
rmsHarmonic mAI 4502
21 ==
πmVESRIV Harmonicc 231 ==
mVV
V Cmeasured 5,11
2==
![Page 15: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/15.jpg)
15Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Still noisy
![Page 16: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/16.jpg)
16Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Common mode noise calculation example
L1
N
PE
2
cmI
cmI
2
cmI
pFC
Khz
Duty
VV
50
150F
50%Cycle
400
sw
=
=
=
=Check 55022 ClassB standard @ 150Khz : Allowed 66 dBµV = 2mV
rmsHarmonic VV
V 1802
2 max1 ==
πmAVCfI Harmonichamonic 4,8....2 11 == π
mVIV cmmeasured 210.25 =Ω=
![Page 17: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/17.jpg)
17Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
« Block & Bypass » examples
![Page 18: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/18.jpg)
18Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Effective frequency range
0
10
20
30
40
50
60
70
0,1 1 10 100 1000
frequency [MHz]
att
en
uati
on
[d
B]
14 µH
30 µH
47 µH
100 µH
1 mH
5 mH
10 mH
20 mH
39 mH
WE-CMB NiZnWE-CMB MnZn
CMB NC
![Page 19: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/19.jpg)
19Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
X-Y capacitors
![Page 20: PFC and EMI filtering - FHI](https://reader030.vdocuments.us/reader030/viewer/2022020700/61f4d25cf22c16548a104653/html5/thumbnails/20.jpg)
20Date dd.mm.201- | Technical Academy | Internal Use/ Public | Topic
© All rights reserved by Wurth Electronics, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com