Epcos has considerably extended its line of snubber capacitors for IGBTs and now covers the voltage range from 850 to 2000 V d.c. and the capacitance range from 47 nF to 2,5 μF.
The components are available with eight different strap terminals that are mechanically and geometrically compatible with most IGBT modules made by Eupec, Fuji, Semikron and Toshiba. Up to five different terminals are available for each case variant.
Switching pulses applied to insulated gate bipolar transistors (IGBTs) lead to voltage spikes that cause parasitic inductance in the link circuit. These transients limit maximum utilisation of the voltage by the IGBT. The IGBT can be protected by connecting snubber capacitors.
A polypropylene film metallised with aluminium and specified for the temperature range from -55 to +100°C is used as the capacitor's dielectric. For higher capacitance values, up to four cylindrical windings in parallel are made per capacitor. The solder straps are welded in place.
Because of their compact and rugged design, the capacitors can also handle high currents. They can operate on up to 18 A rms at 25°C/100 kHz and withstand peak currents up to 1000 A. Equivalent series resistance is less than 35 mΩ at 100 kHz.
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