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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Can MOV VDRs be connected in series to achieve a higher clamping voltage?
Must they both have the same slope characteristics (as well as, proportionately, sustainably sufficient dissipation) to do this effectively and efficiently?
Are there any general rules or tips about series connection of two or more MOVs to achieve a higher clamp voltage? Could a MOV be seriesed with a zener diode and work as an effective clipper at Vz + Vclamp?
Not much that I could find readily on the web, so any advice most welcome.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
The string will clamp at the sum of the clamping voltage. However the string will fail when the smallest component over-currents, or the hottest component overheats.
Being series connected, they will all take the same clamping current. The heat generated in each (power) will therefore be in proportional to the voltage dropped. The temperature rise will be the energy dumped (power * time) divided by their effective thermal mass. Time may have an effect if they have different rise times.
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MOV VDR/Varistor Query
