Over the past two decades, shunt-based current-sensing technology using Broadcom’s optically isolated sigma-delta modulator has gained wide acceptance with industrial general inverters and servo drives over traditional current transformers (CTs) and hall effect sensors (HESs). In addition to small size and low-cost advantages, various current sensing ranges can be easily realized by choosing an appropriate shunt resistance value and connecting to the sigma-delta modulator. This combined solution provides superior performance in terms of accuracy, linearity, input offset over temperature, and signal-to-noise (SNR) ratio while reinforced galvanic isolation is put in place using Broadcom's proven optical isolation technology.

In this article, learn how to use the shunt-based current-sensing technology of sigma-delta modulators in servo drives.

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