Slide 1 Slide 2 Slide 3 Slide 4 Slide 5 Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Slide 11 Slide 12 Slide 13 Slide 14 Slide 15 Slide 16 Slide 17 Slide 18 Slide 19 Slide 20 Slide 21 Product List
inverter-slide5

Again, free wheeling diodes are present in anti-parallel configuration with the switches and are used to commutate the inductive currents during the dead-time between switching states. They are carrying forward current when they are forced into a reverse bias state. As a result, reverse recovery currents in these silicon PiN diodes contribute to switching losses in the diode itself and also add to the turn-on loss in its associated phase-leg switch. By replacing silicon PiN diodes with Wolfspeed Silicon Carbide Schottky diodes, the recovery currents are eliminated, thereby improving the overall losses of the inverter. Only a very small junction capacitive charge current, independent of temperature, is present and is negligible in comparison to the silicon reverse recovery currents. SiC diodes lead to increased system efficiency, a reduction in thermal stress on the components (increased reliability) and a dramatic improvement in the system electromagnetic interference (EMI) signature.

PTM Published on: 2011-10-27