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Continuation of Transformerless Power Supply design

danadakk

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There was a question about a zener failing and turnon transients possibly damaging
zener in circuit from BradtheRad and Klaus. Some one shut off thread before this was
addressed.

Here is a trans sim, the switch was activated at 300V on the positive 1/2 cycle of
220 line V.

As you can see lots of transient current and power into zener :

1710331398723.png




Regards, Dana.
 
Hi,

Thanks Dana for your effort.

We see (expectable) a rather high peak of current. Short, but really stressful for the diode. I can´t imagine the temperature stress on a very tiny zener die.
In one datasheet I saw a surge current rating (I_P) of 810mA for this diode. Surely we see more than 180mA.


Klaus
 

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