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B25655P4707K030 Datasheet(PDF) 2 Page - TDK Electronics |
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B25655P4707K030 Datasheet(HTML) 2 Page - TDK Electronics |
2 / 7 page Technology © EPCOS AG 2016 2 Fig. 1: Cross section of a metalized film capacitor Fig. 2: Self-healing property of a metalized film capacitor Metallized film capacitors (fig.1) have the advantage that for certain failures in the dielectric the capacitor will not go into short thanks to the ultrathin metallized electrode (thickness typical 10 to 100 nm) and the use of aluminium as material for the electrodes. If a breakdown occurs, the aluminium will evaporate around the break- down spot and immediately oxidize to Al 2 O3, which is an excellent insulator. So the breakdown spot becomes high- impedance and is insulated from the rest of the capacitor. The insulated area is formed in a few microseconds and ensures the full functionality of the capacitor after breakdown. This behaviour is called “clearing” or “self-healing” (fig. 2). In prin- ciple there should not be any further clearing during the service life, since all capacitors are typically “cleared” with a voltage of 1.5 times the rated voltage during the production process. Additionally, to limit the energy dissipation during a clearing event, for some designs at least one electrode is divided into segments, connected by small links or fuses. The capacitors are typically named “segmented” or “structured” metalized film capacitors. See fig. 3 example of a “T-segmentation”: EPCOS possesses different winding technologies: The stacked technology, typically used for PCC film capacitors, for which the film is already wound flat on the winding machine. This tech- nology offers the highest fill factor and the lowest ESR. The flat pressed winding tech- nology which is most commonly used on the market for this type of application today. This tech- nology offers the lowest costs at a good performance. Typical rated voltages (V): IGBT rated voltage PCC capacitor Rated voltage Maximum voltage 1) 650 - 705 450 500 750 500 550 1200 900 950 1) For limited time, please refer to data sheet The rated voltage is defined as the continuous operating voltage tak- ing into account for the calculation of the expected lifetime. The maximum voltage is the maximum operating voltage to be applied on the capacitor for short operations (e.g. up to 10% of the expected calculated lifetime). A detailed lifetime calculation based on a mission profile (voltage, temperature) can be submitted upon request. Film assembly Self-healing property 1) Metal-end spray layer 4) Heavy-edge 2) Free margin 5) Dielectric 3) Metallization, flat or CSP (with or without structure) 1) Organic dielectric 7) Boundary layer between 2) Metalized electrodes plasma zone and 3) Material displacing shock wave dielectric 4) Air gap 8) Break down channel 5, 6) Plasma discharge zone 9) Dielectric in gas zone 10) Isolation area |
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