A Guide To Designing Your Own Rogowski Sensor (Part 1)
by Gregory Mirsky, Design Engineer, Deer Park, Ill., How2Power Today, Apr 15 2024
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
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