Althogh the internal working mechanism of switching devices is different, refer to the analysis of the buffer circuit, you only need to consider the external characteristic of the device, the IGBT turn-off model can be equivalent to a voltage-controlled current source, the opening can be equivalent to a voltage control voltage source. The chopper as shown in the general IGBT snubber circuit model.
More details http://www.hqew.net/circuit-diagram/Chopper-IGBT_2294.html
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