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julie_m · 16th Jul 2019, 4:08 pm

D301 and D302 probably are going into reverse breakdown (the PIV isn't precisely specified for ordinary non-Zener diodes, so 129V and 103V are not outrageous). The reverse leakage of D303-304 will be limiting the power dissipation. As long as the applied voltage is not sufficient to push all four diodes out of the normal, reverse-blocking mode, the series combination will retain rectifying behaviour.

16th Jul 2019, 4:08 pm	#2
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: Diode behaviour D301 and D302 probably are going into reverse breakdown (the PIV isn't precisely specified for ordinary non-Zener diodes, so 129V and 103V are not outrageous). The reverse leakage of D303-304 will be limiting the power dissipation. As long as the applied voltage is not sufficient to push all four diodes out of the normal, reverse-blocking mode, the series combination will retain rectifying behaviour. __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.