A Guide To Designing Your Own Rogowski Sensor (Part 1)

Focus:

Current measurement is a common requirement in many power converter and inverter designs. Traction inverters are just one example. Rogowski sensors are an interesting option in this case as they have a very wide current range, very high accuracy (up to 0.1%), and are non-saturating. On the down side, they are very expensive, costing as much as $3000 for an instrument-grade sensor. However, in cases such as a traction inverter, the full accuracy of an off-the shelf Rogowski coil sensor may not be needed. In this case, it may be possible to design and build a lower-cost sensor that retains most of the benefits of this current-measuring sensor. The formulas defining the operation of the Rogowski coil will be derived here in part 1. In particular, the coil’s response to a rectangular waveform is derived.

What you’ll learn:

• How to design a low-cost Rogowski coil current sensor
• How to understand how a Rogowski coil current sensor works
• How to determine the timing response of a Rogowski coil to a rectangular current waveform

View the Source

Author & Publication:

Gregory Mirsky, Design Engineer, Deer Park, Ill., How2Power Today, Apr 15 2024

This article summary appears
in the HOW2POWER Design Guide.

The Design Guide offers
organized access to
hundreds of articles
on dozens of power conversion
and power management topics.

The Design Guide search results
include exclusive summaries
and accurate "how to" analysis
to help you make faster,
more informed decisions.

Search
for more articles