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WIMA DC-LINK Capacitors

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Outline

DC-Link Capacitors: Introduction

Capacitor Technologies

Characteristics

WIMA DC-LINK Range

Applications

Conclusion

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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 8 250 µF

… available in various customized versions

Basic Description

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Technical characteristics

Technology Capacitance per Volume

ESR Irms Stability / Reliability

Plastic Film Improving Low High High

Electrolytic High High Medium Medium

Capacitance drift with temperature

Plastic Film Electrolytic

115%

75%

85%

95%

105%

-60 65-35 -10 15 40 90

Comparison of DC-Link Capacitor Technologies: Film Cap vs. Electrolytics

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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)

WIMA DC-Link Characteristics

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Technical SolutionsBasic Criteria

Metallized plastic film Metallized plastic film

Plastic case (UL 94 V-0) Terminal robustness (according to capacitor size)

Plastic case (UL 94 V-0) Terminal robustness (according to capacitor size)

High self-healing capability Thermal / electrical stability Reliability

High self-healing capability Thermal / electrical stability Reliability

High ripple current capability Low ESR & ESL

High ripple current capability Low ESR & ESL

High resistance to mechanical stress High resistance to mechanical stress

Wound film technology PP film material Variable terminal configurations

Wound film technology PP film material Variable terminal configurations

Requirements and Technical Solutions

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Self-healing Characteristics of Metallized Film

Schematic depiction of the self-healing process

Isolated area after the self-healing process

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 channelc = current flowd = de-metallized area

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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

Terminal Configurations

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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

111315172017192024273135403545

27.527.527.527.527.537.537.537.537.537.537.537.537.552.552.5

57.57.510

12.51010

12.512.5202020202020

0.80.80.80.80.811111111

1.21.2

0.40.40.40.40.40.40.40.40.40.40.40.40.40.80.8

PCM d

27.537.5

0.81

DC-LINK MKP 3:

Cylindrical capacitor body with screw fixingfor PCB mounting

Capacitors are non-polarized and aredesigned with maleor female screw connection.

D L

84.584.5

5164

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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.


D L

505050

5795

120

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

8585858585858585116116116116116

60768595

11012013214095

110120132140

32323232323232325050505050

12121212121212121414141414

6666666655555

D L a b c

858585858585858585

116116116116116116116116116

110140155185210235252260345110140158185215230255295342

323232323232323232505050505050505050

121212121212121212141414141414141414

666666666555555555

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DC-LINK HY:

Rectangular capacitor body with screw fixingand screwable plate connections

Customized capacitors with variable contact configurations on request.

W H L a b c d

84107130

6691114

179179179

828282

132132132

255073

7.57.57.5

84107130

6691114

291291291

135.5135.5135.5

239239239

255073

101010

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Speed Adjustment and Control of Three-Phase AC Motors

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

Mains Mains Filter Mains Rectifier Voltage Motor Inverter Motor Intermediate

Circuit

Application: Frequency Converter

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Layout of a DC distribution network for offshore windparks

DC/DC converter

Application: DC/DC Converters

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DC capacitor as intermediate circuit buffer

Mains Rectifier Buffer Motor Inverter

Mains Motor

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

Typical Converter Circuit using a DC-Link Capacitor

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Customized Solutions

2 x 1500 µF800 VDC

1100 µF600 VDC

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Customized Solutions

500 µF450 VDC

350 µF800 VDC

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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

Selection of Capacitors for Customized Applications

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WIMA film capacitor technology isreplacing 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: www.wima.com

Conclusion

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Competitors

Kemet Vishay TDK/Epcos AVX Electronicon Faratronic

Product Family Range Description Picture

DC-LINK MKP 3 35 µF – 200 µF700 VDC to 1500 VDC

C4DE B2563… FFVE/FFVI(FFVS)

E53 C3AC3A(G)

DC-LINK MKP 4DC-LINK MKP 4S

2 µF – 150 µF450 VDC to 1300 VDC

C4AE MKP1848MKP1848CMKP1848S

B32674…678B32774…778

FBFE

C3D


E61


C44U ESTA: HDMKP B2562… FFLI PK16 XC (E50) C3B

DC-LINK HC 140 µF – 8250 µF450 VDC to 1500 VDC

Customized solutions on request

PCC LP: B25655…

FFLC C36

DC-LINK HY 500 µF450 VDC

B25655 C3NC36

Cross-Reference List

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WIMA Spezialvertrieb elektronischer Bauelemente GmbH & Co.KG

Besselstr. 2-4D-682199 MannheimGermany

Phone: +49-621-86295-0Fax: +49-621-86295-95Email: [email protected]: www.wima.com

Thank You !

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