Filter Attenuation Measurement Method Using Electrical Fast Transient Burst (EFTB) [Part 3 of 3]

In our previous blog post, we introduced a project we started in order to offer our customers more information on electrical fast transient burst (EFTB) attenuation.

In this post, we're diving deeper into this collaborative effort between Rich Spangenberg from Schneider Electric and Jared Quenzer from Wurth Electronics by explaining their measurement methodology and the challenges they faced.

If you’ll be attending APEC 2019 in Anaheim, California, you can learn even more about this topic by attending Jared’s session on Thursday, March 21, at 1:45PM in room 213B or by stopping by our booth to ask us questions about filter attenuation using EFTB (or anything else!).

Common Mode Attenuation Results

Once the time domain and frequency domain were measured, Rich and Jared compared those measurements to a small-signal graph.

Some of their most significant common mode observations included:

  • EFTB attenuation can vary significantly from “small-signal characterization”
  • Increasing EFTB amplitude tends to reduce attenuation
  • Increasing DC bias current tends to reduce attenuation (more details on this in the future).

Why are there differences? Is there a clear difference on all CMCs or just certain CMCs with a particular core material or construction techniques?

Differential Mode Attenuation Results

Finally, Rich and Jared looked at the differential mode attenuation. They applied the EFTB in differential mode, with the same configuration as the small-signal test method.

In this test, the 4kV and small signal measurements actually matched pretty well. That potentially indicates for the specific CMCs measured, there might be fewer saturation effects in differential mode.

EFTB Test Conclusions

So, what did all this EFTB testing achieve?

Rich and Jared’s goal was to establish a standardized EFTB insertion loss measurement. They knew that, as an end user, you care about finding something that works for your application. If you are designing for an industrial environment, this EFTB test cannot be ignored! You want to be able to go to Wurth Electronics and find which parts have the best attenuation of EFTB.

Two Different Companies, One Collaborative Effort

In the end, it wasn’t just Wurth Electronics or Schneider Electric doing this testing. We were able to arrive at these significant findings (and thus provide the very best information for our customers) because both companies collaborated on this project.

It all goes to show how much we can achieve when we work together!

Interested in learning more about the filter attenuation measurement method using electrical fast transient burst (EFTB)?

Visit us at APEC 2019, where you can attend Jared’s session on this topic (on Thursday March 21, at 1:45PM in room 213B) and ask him any questions you may have!

You can also request more information about how common mode chokes attenuate EFTB.

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