[sdiy] MOV's in wave wrappers!

[ASSI]

Hi Karl,

it's not helpful to re-post a question under a different subject.  I 
can only guess what your question really is, as you didn't give much 
information to start with. From the little you've said, my guess is you 
are talking about varistors.

On Thursday 20 May 2004 01:37, Karl Dalen wrote:
> How temperature dependant are MOV's?

The general UI characteristic of a varistor made of sintered metal 
oxide ceramic or SiC is

U = aI^b + cI

where a and c have a negative tempco of about 1500ppm and b is almost 
independent of temperature.

> Are there any serious drawbacks parameters
> in MOV's? It seams that the low voltage
> devices have quite high capacitance, is
> this capacitance voltage dependent?

The self-capacitance of a varistor is voltage and frequency dependent.  
The dependance is rather extreme, which may be what you're after or 
maybe not.


Achim.
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