Frederick Community College
Question
Asked 13th May, 2021
How to calculate diode recovery loss from datasheet?
I have attached a datasheet with this question. I am trying to calculate losses associated with the diode. I have successfully calculated conduction loss. I have got the current in the diode and put it in the lookup table which I made in Matlab, from this I got the corresponding voltage and multiply the current and voltage to get conduction loss. However, I wanted to find the reverse recovery loss. But I am not sure which graph to consider from the datasheet.
All Answers (2)
Hello Arkadeep Deb ,
I hesitate to even approach your question because as is stated in [1] "Calculation of recovery time under an arbitrary set of conditions is a difficult, if not an impossible, task (p. 1-15)." The data sheet for the Infineon IDW100E60 Fast Switching Emitter Controlled Diode has some tables and graphs about reverse recovery and charge storage on pp. 2 (tables) & 4 (graphs). However, the aforementioned datasheet does not contain the I & V versus t plots you need to understand the meaning of the terms used in the tables and graphs, e.g., to what does the parameter tb refer? In addition, in order to calculate the reverse recovery loss, you would need to know how the voltage difference and current across the diode changes with time during reverse recovery.
If you take a look at the International Rectifier application note at the following URL: https://www.infineon.com/dgdl/an-989.pdf?fileId=5546d462533600a40153559fa625124d , you will see in Fig. 2 on p. 2 a figure containing the I & V versus t plots associated with reverse recovery of a diode. Note, the following important relationship trr = ta + tb is defined in this figure. Note, International Rectifier is a subsidary of Infineon.
Because Fig. 2 is generic, you essentially have to measure all the parameters in the figure for your specific conditions of VF and IF before you could construct your lookup tables. I don't know who gave you this assignment, but they must be testing your fortitude.
[1] Anonymous (Technical Information Center); Motorola Silicon Rectifer Data Manual; Motorola Inc.; 1980; pp. 1-14 - 1-16 (Charge Storage) & 1-18 - 1-20 (Diode Model).
Regards,
Tom Cuff
The University of Warwick
Thank you Thomas Cuff for your answer. I will definitely try that. Moreover, this is indeed a difficult task as I am a Ph.D. student in my first year. And I am trying to build something and calculate the losses and efficiency of the system. If you could please try to answer my 2nd question which can be viewed in my profile.
Thank you Once Again.
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