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IGBT Absorbing Circuit

2014-11-25 17:39  
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IGBT Absorbing Circuit
Except the large-capacity devices, the IGBT absorbing circuit has two kinds which are shown in the picture. And, the picture (a) is the most simple capacitance absorbing circuit (C absorbing circuit). The main circuit's inductor and capacitor C1 would generate the resonance. If C1 is too small or the main circuit inductor is too large, the DC power wire's voltage would have a big variation. The picture (b) shows the resistance-capacitance diode absorbing circuit (RCD absorbing circuit) which is complex. But the DC power wire's voltage has small variation. When the main circuit inductor is big, this absorbing circuit's performance of limiting the surge voltage would be good. But it should note the function of diode VD1. If having wrong selection it would generate the voltage oscillation.