Were is the high current coming into the zener diodes

Thread Starter

pager48

Joined Nov 25, 2018
161
The coil voltage is below zeners clamp but with zeners attached to circuit node zeners conduct without clamping voltage being reached.

How can the clamp be adjusted to conduct only when coil voltage exceeds clamp voltage?

Unclamped:




Clamped:

 

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AlbertHall

Joined Jun 4, 2014
10,537
A zener diode in the forward direction conducts like a normal diode - about 0.7V.
You need to connect another three zener diodes in series with the existing three, but the other way round.

See the double diode clamp circuit here.
 
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