RCD + Z should TVS be uni or bi directional
Posted by: KIS
on
I have made the attached design in PI Expert online.
The TVS in the RCD + Z snubber was chosen by PI Expert as a bidirectional TVS, is this correct?
In the schematic VR1 is shown as a unidirectional.
What is the correct type TVS to choose?
Files
| Attachment | Size |
|---|---|
| PI Design | 1.23 MB |
Comments
I don't knw why PI Expert is assigning a bidirectional TVS for the primary clamp - I'll bring it up with the web team. A unidirectional device is the usual option for the primary clamp, and likely less expensive as well.
Hi,
Typically unidirectional, but a bidirectional TVS would work similarly for our purpose. In this case, the chosen bidirectional TVS would just operate as if its unidirectional, and it won't operate in the other region due to diode blocking.