Diode Malfunction: 1N4007 Troubleshooting at 900V

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SUMMARY

The discussion centers on the troubleshooting of 1N4007 diodes used in a voltage multiplier circuit operating near the maximum reverse voltage of 900V. Users report that while these diodes function correctly at lower voltages (200V), they exhibit malfunction at higher voltages despite appearing intact when tested with an ohmmeter. The phenomenon is attributed to the inherent leakage characteristics of Zener diodes under high reverse voltage conditions, which can vary based on temperature and individual diode characteristics.

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Electronics engineers, hobbyists working with high voltage circuits, and anyone troubleshooting diode performance in voltage multiplier applications.

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Hello. I use 1N4007 diodes in a voltage multiplier near the maximum authorized 900 V (max reverse 1000 V). Some don't work and I replace them, but ... With an ohmeter they look correct and more using them with medium voltage ( 200 V ) they work perfectly. So they aren't destroyed, could someone explain me this phenomenon ?
 
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All diodes are "Zener" diodes. They leak a little when the reverse voltage gets high enough. They won't be damaged as long as they don't get too hot. Also, the reverse voltage at which they leak depends on temperature, and certainly there'll be variation from one 1N4007 to another.
 
Thanks for your answer
 

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