Ken Javor wrote:
>
> When choosing transient suppression for power line input to equipment, what
> are the choices (MOVs, silicon TVS, glass discharge tubes, others) and what
> are the trade-offs? Thank you.
Hello Ken,
Here are some typical device types I've come across for transient
suppression:
Varistors (MOVs):
Voltage Range 35 - 1400 V
Max. Current 50 - 100 A
Response Time 1 nsec
Gas Discharge Tubes:
Voltage range 75 - 10,000 V
Max. Current 1000+ A
Response Time 1000 nsec
Zener or Avalanche Diodes (lower voltage DC, Signal)
Voltage Range 5 - 200 V
Max. Current 1.5 - 10 A
Response Time 1 nsec
Each device type has its own set of characteristics like polarity of
operation and failure mode. You may also need to consider the shunt
capacitance which can vary from 1pF to 100 nF depending on the device
type. Which type is best? It all depends on the specific application,
transient signal and the susceptibility of the equipment you are
protecting. It usually boils down to a trade-off between speed, size,
transient handling capacity and cost.
Hope that helps.
Regards,
Dan
--
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Dan Kwok Vancouver, BC, Canada
Intetron Consulting, Inc. Telephone 604.432.9874
Email [email protected]
"FREE EMC Tips @ our website http://www.intetron.com";
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