WIMA DC-LINK Capacitors
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1 WIMA DC-LINK Capacitors Page 1
2 Outline DC-Link Capacitors: Description Capacitor Technologies Characteristics WIMA DC-LINK Range Applications Conclusion Page 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 4,500 µf available in various customized versions Page 3
4 Comparison of DC-Link Capacitor Technologies: Film Cap vs. Electrolytics Technical criteria 115% Capacitance drift with temperature Technology Capacitance per Volume ESR Irms Stability / Reliability 105% Plastic Film Improving Low High High 95% Electrolytic High High Medium Medium 85% Plastic Film Electrolytic 75% Page 4
5 DC-Link Characteristics Very high volume / capacitance ratio Non-polar construction High voltage rating per component Particularly reliable contact configuration Very low dissipation factor (ESR) High shock and vibration resistance Very high insulation resistance Outstanding mechanical stability Excellent self-healing properties Solvent-resistant, flame retardant plastic case (in accordance with UL 94 V-0) Long life expectancy Page 5
6 WIMA DC-LINK Portfolio WIMA DC-LINK MKP 4 MKP 5 MKP 6 HC VDC µf Page 6
7 Requirements and Technical Solutions Basic Criteria High ripple current capability Low ESR & ESL Technical Solutions Wound film technology PP film material Terminal configurations High self-healing capability Thermal / electrical stability Reliability Metallized plastic film High mechanical performance Plastic case (UL 94 V-0) Terminal robustness (according to capacitor size) Page 7
8 Wound Film Technology 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 breakthrough 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 Page 8
9 Terminal Configurations DC-Link Termination Options: Particularly reliable contact-configurations, 2-pin and 4-pin versions (screwable plate versions on request) DC-LINK MKP 4 Cylindrical capacitor body with pin connections for PCB mounting DC-LINK MKP 5 Cylindrical capacitor body with M6 screw connections and M12 screw bolt for bus bar mounting DC-LINK MKP 6 Versatile and safe contact configurations by screwable plates DC-LINK HC Page 9
10 Terminal Configurations DC-LINK MKP 4: 2-pin or 4-pin version (screwable plate versions on request) DC-LINK MKP 5: Cylindrical capacitor body with pin connections for PCB mounting W PCM b d c PCM d Capacitors are nonpolarized D L Capacitors are non-polarized. The centre termination is designed as one pole whereas the four outer terminations form the other pole. The sum of the outer terminations diameters is virtually identical with the diameter of the centre termination. Page 10
11 Terminal Configurations DC-LINK MKP 6: Cylindrical capacitor body with screw connections for bus bar mounting DC-LINK HC: In rectangular plastic case or as moulded version with screwable plate connections Wiring versions D D1 L not connected V1 Capacitors are non-polarized and are designed with two M6 screw connections and a M12 earth bolt. - optional screw fixing Capacitors are non-polarized and can be connected by user on capacitance (V1) or on voltage (V2). Customized solutions on request. V2 Page 11
12 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 Page 12
13 Application: DC/DC Converters Layout of a DC distribution network for offshore windparks DC/DC converter Page 13
14 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 Mains Mains Rectifier Buffer Motor Inverter Motor - High ripple current capability and resistance against superimposed AC- and pulse voltage respectively DC capacitor as intermediate circuit buffer Page 14
15 Page 15
16 Page 16
17 Page 17
18 Page 18
19 Page 19
20 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 Page 20
21 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: Page 21
22 Thank You! PT ELECTRONICS Департамент пассивных компонентов , Санкт-Петербург, пр. Энгельса 71 тел. +7 (812) факс: +7 (812) Page 22
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