I need to know a good estimate for the parasitic capacitance of a bridge rectifier diode (50/60Hz) roughly in the parameter range 1.2V and 10A. I can't find anything in datasheets. I would like to know if this capacitance is in the range of 10pF or 100pF or 1nF or even higher.

 

datasheet, page 1
datasheet, page 2

 

Thank you, a good starting point! Do you think the capacity would increase in case such rectifier diode dies would be in a little power module (diode bridge)? Probably not ... ?

 

A dead diode that is shorted, therefore is not a capacitor, it's a conductor.
A dead diode that is open is probably still a capacitor.

 

Thank you for the datasheets! That answered my question.

 

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A dead diode that is open is probably still a capacitor.

But probably a much smaller capacitor since an open diode likely means a break in the internal connection so you would not see the normal junction capacitance.

 

I need to know a good estimate for the parasitic capacitance of a bridge rectifier diode (50/60Hz) roughly in the parameter range 1.2V and 10A.

Are you talking about reverse biased junction capacitance, or forward? When reverse biased, junction capacitance will decrease with increasing voltage. The opposite happens when forward biased.

 

It is about a simple model of common mode current paths in a converter. So I thought about a parasitic capacitor in parallel to an ideal diode for the diode bridge. But according to comments from crutschow and dl324 it wouldn't work like this? I know there are good spice models available for such a task but for this project I use a simulator that works with ideal diodes and switches.