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Driving Circuit Transformer Primary And Secondary Circuit

2014-11-22 20:00  
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Driving Circuit Transformer Primary And Secondary Circuit
The picture shows the IGBT switch tube's driving circuit transformer primary and secondary principle circuit. The R235-R238 are grid electrode series resistance. It is important for IGBT grid electrode driving by selecting adequate grid electrode series resistors.Its openning and closing are achieved by the grid electrode circuit's charging and discharging. The grid electrode resistor with low value would make the grid electrode capacitot's charging and discharging be fast. So it would reduce the switching time and switching power consumption. When it has short circuits or it is during the closing time of fly-wheel diode which has bridge connection to the crossing IGBT, the added du/dt on the IGBT and its collector polar's a grid electrode capacitor could cause the case that there is current through the grid electrode circuit. If this current is large enough, this would generate voltage between grid electrode resistors and make the IGBT be wrong connected.