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Silicon Carbide Rectifiers Slide 7

Shown here is a comparison of silicon-carbide versus other solutions. It shows the turnoff or reverse recovery comparison going from a conducting state to a non-conducting state of a silicon-carbide versus other solutions. It is faster than a bipolar or ultrafast device. This also illustrates the relatively smooth turnoff versus the snappiness of a bipolar device. STMicro’s tandem bipolar devices actually start to compete with silicon-carbide in terms of reverse recovery but even more on price. This shows an offline application of a 400 W power factor correction circuit with some specific conditions. It shows the overall power losses using a bipolar device, a couple generations of tandem bipolar devices and then a silicon-carbide. The lowest power losses are going to be in the solution that uses the silicon-carbide device. What that means is that in this particular circuit, the lack of switching losses in the diode is really translating to overall improvement in power supply efficiency.

PTM Published on: 2014-09-30