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Diode Switching Loss.

QuickerMan

Hi. This is my second post here :)

 I've been trying to quantify conduction and switching losses in a classical dc-dc boost converter. Firstly I estimated them by using datasheet parameters for the diode and mosfet, and secondly the results were compared with the simulated results.

There are huge differences for switching loss during the diode turn-off. I just realized that the ultrafast diode MUR1520 spice model don't seem to take switching loss into account.That is, the reverse recovery current at its peak is not coincident with the maximum voltage through the diode, and loss in the simulation is much less than the calculated value.

 Does anyone know a spice model for an ultrafast diode that really could gimme the real behavior of the device?

Many thanks.

  • Alok Tripathi
    You may want to tweak the "TT" model parameter and see if this gives you desired results. Diode primitive model may not give you very good estimation of switching loss.   
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