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I don't want to let go of this without at least a cursory examination of the quotation you posted:

"shunt resistors can actually create problems because they can produce a low-impedance source of damaging current to any diode that may have reached avalanche potential."

This claim raises at least one troubling question. If a diode in the string has reached avalanche potential, in other words, its PRV has been exceeded, are the resistors really the issue of concern? Isn't this a theoretical problem that doesn't exist in properly designed circuitry? If a diode avalanches, and the current path through the resistor causes junction failure, it only means the designer failed to install a sufficient number of diodes relative to the total PRV of the string.

I am also skeptical of the author's claim that the resistors provide a low-impedance source for current flow. Values for these resistors are typically in the vicinity of 470k. This seems almost insignificant as a parallel value when considering the impedance of a diode that has avalanched.


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