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Image of Allegro Microsystems Magnetic High-Current Sensors - Background and Motivation

Now that these two techniques have been discussed, which one should the customer use? The coreless-based current sensors, also called the magnetic linear field sensors, are the most practical to use for currents that are very high, sometimes up to 1000A, thanks to their lossless nature. Core-based solutions nevertheless are the most vastly used by their good coupling factor, ease-of-implementation and their accuracy, even though their size is much bigger, they are much more expensive and present some magnetic hysteresis that needs to be compensated. Coreless methods on the other side do not have these challenges, but would be compromising on the other parameters such as the Signal-to-Noise Ratio (SNR), a lower bandwidth, a decreased noise immunity because of the cross-talk and stray fields, as well as some placement tolerance issues that could arise. So ultimately, it will depend on the application to see what are the compromises the customer is willing to take. The field sensors are more recent and get better performance with newer generations, along with a better understanding from the public thanks to more widely available tools and content that can be found online.

PTM Published on: 2021-02-18