1. WIMA DC-LINK Capacitors

2. Outline DC-Link Capacitors: Introduction Capacitor Technologies
Characteristics
WIMA DC-LINK Range
Applications
Conclusion 2

3. Basic Description WIMA DC-LINK capacitors are…
… designed for applications in high power converter technology
… substituting more and more electrolytic capacitors
… manufactured with low loss Polypropylene dielectric
… showing high current capability and low dissipation/self-heating
… available in rectangular and cylindrical cases with capacitances up to µF
… available in various customized versions

4. Comparison of DC-Link Capacitor Technologies: Film Cap vs
Comparison of DC-Link Capacitor Technologies: Film Cap vs. Electrolytics
Technical characteristics
Technology
Capacitance per Volume
ESR
Irms
Stability / Reliability
Plastic Film
Improving
Low
High
Electrolytic
Medium
Capacitance drift with temperature
115%
105%
95%
Plastic Film
Electrolytic
85%
75%
-60
-35
-10 15 40 65 90

5. WIMA DC-Link Characteristics
Very high volume / capacitance ratio
High voltage rating per component
Very low dissipation factor (ESR)
Very high insulation resistance
Excellent self-healing properties
Long life expectancy
Non-polar construction
Particularly reliable contact configuration
High shock and vibration resistance
Outstanding mechanical stability
Solvent-resistant, flame retardant plastic case (in accordance with UL 94 V-0)

6. Requirements and Technical Solutions
Basic Criteria
Technical Solutions
High ripple current capability
Low ESR & ESL
Wound film technology
PP film material
Variable terminal configurations
High self-healing capability
Thermal / electrical stability
Reliability
Metallized plastic film
High resistance to mechanical stress
Plastic case (UL 94 V-0)
Terminal robustness (according to capacitor size)

7. Self-healing Characteristics of Metallized Film
During operation voltage spikes and/or high temperature may impact the capacitor
An electrical breakdown occurs causing temperatures of several thousand °C
The metallization evaporates in the area of the break-down channel
A metal-free zone is created isolating the area electrically.
The capacitor has regenerated (self-healed) completely.
b = breakdown channel c = current flow d = de-metallized area
Schematic depiction of the self-healing process
Isolated area after the self-healing process

8. Terminal Configurations
DC-Link Termination Options:
Cylindrical plastic case with screw fixing and male or female connections  DC-LINK MKP 3
2-pin and 4-pin versions (screwable plate versions on request)
 DC-LINK MKP 4 / DC-LINK MKP 4S
Cylindrical capacitor body with pin connections for PCB mounting
 DC-LINK MKP 5
Cylindrical capacitor body with male or female connections for bus bar mounting
 DC-LINK MKP 6
Versatile and safe contact configurations by screwable plates
 DC-LINK HC / DC-LINK HY

9. Terminal Configurations
DC-LINK MKP 3:
Cylindrical capacitor body with screw fixing for PCB mounting
Capacitors are non-
polarized and are
designed with male
or female screw
connection.
DC-LINK MKP 4 / DC-LINK MKP 4S:
2-pin or 4-pin version (screwable metal plate versions on request)
Capacitors are non-
polarized W
PCM b d c 11 13 15 17 20
1719 24
27 31 35 40 45
27.5
37.5
52.5 5
7.5 10
12.5
20 20
0.8 1
1 1
1.2
0.4 D L
84.5 51 64
PCM d
27.5
37.5
0.8 1

10. Terminal Configurations
DC-LINK MKP 5:
Cylindrical capacitor body with pin connections for PCB mounting
Capacitors are non-polarized.
The centre termination is
designed as one pole
whereas the four outer
terminations form the other
pole.
DC-LINK MKP 6:
Cylindrical capacitor body with screw connec-tions for bus bar mounting
Capacitors are non-polarized
and are designed with male or female screw connection. D L a b c 85
116
110
140
155
185
210
235
252
260
345
158
215
230
255
295
342 32 50 12 14 6 5 D L 50 57 95
120 D L a b c 85
116 60 76 95
110
120
132
140 32 50 12 14 6 5

11. Terminal Configurations
DC-LINK HY:
Rectangular capacitor body with screw fixing and screwable plate connections
Customized capacitors with variable contact configurations on request.
DC-LINK HC:
In rectangular plastic case with PU sealing
Capacitors are non-polarized. Customer-specific tabs, capacitances or voltages on request. W H L a b c d 84
107
130 66 91
114
135.5

12. Speed Adjustment and Control of Three-Phase AC Motors
Application: Frequency Converter
Speed Adjustment and Control of Three-Phase AC Motors
Mains Mains Filter Mains Rectifier Voltage Motor Inverter Motor Intermediate Circuit
Frequency Converters are designed for starting, braking, speed adjustment as well as control or positioning of three-phase AC motors.
Fields of application: Trains, Freight Elevators, Wind Power Plants

13. Application: DC/DC Converters
Layout of a DC distribution network for
offshore windparks
DC/DC converter

14. DC capacitor as intermediate circuit buffer
Typical Converter Circuit using a DC-Link Capacitor
Requirements for DC-LINK
For plastic film capacitors highest volume/capacitance ratio combined with high DC voltage strength by self-healing capability
Intermediate circuit voltage =/> 450 V
High ripple current capability and resistance against superimposed AC- and pulse voltage respectively
Mains Rectifier Buffer Motor Inverter
Mains Motor
DC capacitor as intermediate circuit buffer

26. Customized Solutions
2 x µF
800 VDC
1100 µF
600 VDC

27. Customized Solutions
500 µF
450 VDC
350 µF
800 VDC

28. Selection of Capacitors for Customized Applications
Operational Data Required:
Electrical data of the capacitor - Capacitance - Rated voltage (DC / AC) - Tolerance* - Dimensions* / PCM*
Electrical data of the application - Voltage Current - Pulse frequency / Repetition frequency - Time axis - Pulse rise time*
Application data - Ambient temperature - Kind of application*
Oscillogram (voltage and current) appreciated *optional

29. Conclusion WIMA film capacitor technology is
replacing more and more electrolytic
capacitors in DC-Link applications
 made possible due to:
Longer life time and growing efficiency requirements in applications
Parameter stability that makes the design easier
New film cap designs with greater density of capacitance per volume (reducing the size)
For more information:

30. Cross-Reference List Competitors 30 Kemet Vishay TDK/Epcos AVX
Electronicon
Faratronic
Product Family
Range Description
Picture
DC-LINK MKP 3
35 µF – 200 µF 700 VDC to 1500 VDC
C4DE
B2563…
FFVE/FFVI (FFVS)
E53
C3A C3A(G)
DC-LINK MKP 4 DC-LINK MKP 4S
2 µF – 150 µF 450 VDC to 1300 VDC
C4AE
MKP1848 MKP1848C
MKP1848S
B32674…678
B32774…778
FB FE
C3D
DC-LINK MKP 5
16 µF – 260 µF 500 VDC to 1300 VDC
E61
DC-LINK MKP 6
75 µF – 4920 µF 600 VDC to 1500 VDC
C44U
ESTA: HDMKP
B2562…
FFLI
PK16 XC (E50)
C3B
DC-LINK HC
140 µF – 8250 µF 450 VDC to 1500 VDC
Customized solutions on request
PCC LP: B25655…
FFLC
C36
DC-LINK HY
500 µF 450 VDC
B25655
C3N C36 30

31. Thank You ! WIMA Spezialvertrieb elektronischer
Bauelemente GmbH & Co.KG
Besselstr. 2-4 D Mannheim
Germany Phone: Fax:
Internet: