WIMA Snubber / GTO Capacitors
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1 WIMA Snubber / GTO Capacitors Page 1
2 Outline IGBT (Insulated Gate Bipolar Transistor) Typical Snubber Circuits used with IGBTs Features of WIMA Snubber Capacitors Versions of WIMA Snubber Capacitors Typical GTO (Gate Turn Off) Circuit Features of WIMA GTO Capacitors Application Guide for WIMA Capacitors Page 2
3 IGBT (Insulated Gate Bipolar Transistor) Requirements of advanced power semiconductors IGBT (Insulated Gate Bipolar Transistor) and IGBT-Modules -increased switching voltage and current -increased switching speed -low inductance circuit Risk: Even the low self-inductance of the power bus may induce dangerous voltage overshots between collector and emitter which may result in the destruction of the valuable power semiconductors. Typical voltage overshot during switch-off. Page 3
4 Typical Snubber Circuits used with IGBTs Requirement to protect IGBTs -snubber suppressor circuits based on low-inductance pulse capacitors to attenuate or cut off peak voltages -in general, three basic snubber circuits are used with IGBTs to suppress dangereous induced voltages produced during switching of high currents Criteria in selecting capacitors - low self-inductance - high pulse load capability - low loss factor / ESR - high mechanical stability Capacitor Capacitor-resistor-diode Capacitor-resistor-diode Page 4
5 Snubber Capacitors for High Power Conversion Features of WIMA Snubber Capacitors Capacitances: 0.01 µf - 25 µf Voltages: 250 VDC VDC Dielectric: Polypropylene (PP) film Properties: - Plates soldered directly to the schoopage for safe contacts at high rms currents - Low inductance construction achieved by endsurface contacts - High pulse reliability due to double-sided metallization and/or film/foil construction - High voltage/overvoltage strength by internal series connection with self-healing metallized floating electrode - Available in various contact configurations - Flame retardent plastic case in accordance with UL 94 V-0 Fields of Application - IGBT applications subject to high pulse and high frequency requiring extremely reliable contacts Page 5
6 WIMA Snubber Capacitors WIMA Snubber MKP Capacitance range: µf - 25 µf Rated voltages: 250 VDC VDC Dielectric: Polypropylene (PP) film Climatic test category: 55/100/56 according to IEC Reliability: Operational life > hours Failure rate < 1 fit (0.5 x Ur / 40 C) Internal construction: WIMA Snubber FKP Capacitance range: 0.01 µf µf Rated voltages: 630 VDC VDC Dielectric: Polypropylene (PP) film Climatic test category: 55/100/56 according to IEC Reliability: Operational life > hours Failure rate < 1 fit (0.5 x Ur / 40 C) Internal construction: Page 6
7 Versions of WIMA Snubber Capacitors WIMA Snubber capacitors are available in various contact configurations - customized versions on request Page 7
8 Typical GTO (Gate Turn Off) Circuit Purpose of GTO Capacitors - to attenuate voltage rise during switch off phase of GTO thyristor GTO Applications -stationary and mobile drives or traction systems with GTO thyristors subjected to voltages up to 2000V and currents exceeding 1000A respectively Chopper Circuit with GTO Thyristor Page 8
9 GTO (Gate-Turn-Off) Capacitors with Screw Connection Features of WIMA GTO Capacitors Capacitances: 1.0 µf -100 µf Voltages: 400 VDC VDC Dielectric: Polypropylene (PP) film Properties: - Very low self-inductance - High pulse capability - High rms current carrying capability - Excellent self-healing property - High shock and vibration resistance - Outstanding mechanical stability - Almost unlimited life expectancy Fields of Application GTO applications subject to high current and voltage, e.g. - converter equipment in power generation or in traction technology for train drives, hoists, crane drives etc. Page 9
10 WIMA GTO Capacitors WIMA GTO MKP Capacitance range: 1.0 µf µf Rated voltages: 400 VDC VDC Dielectric: Polypropylene (PP) film Climatic test category: 55/085/56 according to IEC Reliability: Operational life > hours Failure rate < 1 fit (0.5 x Ur / 40 C) Terminations: Axial screw connection M6 or M8 Internal construction: Screw connection Capacitor element with end surface contacts PU-seal Plastic case W L L1 M M6 M6 M8 M8 M8 M8 Page 10
11 Industrial Electronics Power Supplies/UPS/SMPS AC/DC Converters Measuring and Control Equipment Coupling/ Blocking SMD MKS 02 MKS 2 MKS 4 RFI - Suppression MKP-X2 MKP-Y2 MP3-X2 MP3-X1 MP3-Y2 MP3R-Y2 Decoupling/ Bypassing Energy Storing Smoothing A/D Conversion SMD MKS 02 MKS 2 FKS 3 FKS 2 MKS 4 MKP 2 * FKP 1 MKP 10 Snubber FKP 4 GTO * > 250VDC SMD MKS 4 MKS 02 MKP 4 MKS 2 MKP 10 FKP 02 FKP 3 FKP 2 MKP 4 MKP 2 Voltage Dropper Oscillating Temperature Compensating Snubbing MP3-X2 MP 3-X2 SMD-PPS FKP 02 MKP 4 MKP 10 FKP 2 FKP 4 FKP 02/2 MKP 2 FKP 02/2 MKP 2 * FKP 3 MKP 10 * > 250VDC MKS 4 * * > 630VDC > PCM 10 MKP 2 * FKP 1 FKP 3 * > 250VDC FKP 3 MKP4 FKP 4 FKP 1 Snubber GTO Page 11
12 Selection of Capacitors for Customized Applications Operational Data Required for Capacitor Calculation Electrical data of the capacitor - Capacitance - 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* Oscillogramme (voltage and current) appreciated *optional Page 12
13 Thank you! PT ELECTRONICS Департамент пассивных компонентов , Санкт-Петербург, пр. Энгельса 71 тел. +7 (812) факс: +7 (812) Page 13
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