Question

What is Lrr in 'Thyristor with reverse recovery'?

Answer 1

Hello,

Please see the reference paper for this implementation, and specifically a short discussion of the inductance on Page 3: https://cds.cern.ch/record/291468/files/cn-95-016.pdf

Let us know if you have further questions.

Regards,

Kris

Comments

Hi. 

Your answer was helpful. According to the document attached, the exponential decay of the thyristor current during turn-off depends on I_rrm, L/R_L and t_s. Though L/R_L does not change with varying operating conditions of the circuit, I_rrm and t_s (or t_rr) do change.

In my circuit, I_fo and dI_r/dt are independent quantities as I can change them easily. But I_rrm, t_s and Q_rr depend on them. There must be some (simplified) relationship between these dependent and independent quantities. Can you help me out regarding this knowledge? I am eager to know how these are related and what determines trr for various I_fo and dI_r/dt.

Thanks,

Malepati Sankar.

 

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Hi Malepati,

If you look under the mask (Ctrl+U) of the component, you can inspect the implementation as it is completely open. Further, in the mask initialization commands (Ctrl+M), you will see that a function "plrrdiode.m" is called and that calculates the resistance and gain values using additional parameters specified by the user in the mask. This function is also accessible in your PLECS installation in the private/ folder. I encourage you to go through the equations yourself, but let me know if you have further questions.

Regards,

Kris