Accurate current sensing is critical in many industrial applications, such as battery management and motor control. Precise shunt-based current sensors have been reported with gain errors of less than 1% over the industrial temperature range (-40°C to 85°C) –. However, since they are intended for coulomb counting, their bandwidth is limited to a few tens of Hz, making them unsuitable for battery impedance or motor-current sensing. This paper presents a current sensor with a wide (10kHz) bandwidth and a tunable temperature compensation scheme (TCS), which allows it to be flexibly used with different types of shunts while maintaining high accuracy. A low-cost room-temperature calibration scheme is proposed to optimize gain flatness over temperature by exploiting the shunt's self-heating at large currents. Over the industrial temperature range and a ±25A current range, it achieves state-of-the-art gain error (±0.25%) with both low-cost PCB and stable metal-alloy shunts.
|Title of host publication||2022 IEEE International Solid- State Circuits Conference (ISSCC)|
|Subtitle of host publication||Digest of technical papers|
|Editors||Laura C. Fujino|
|Place of Publication||Danvers|
|Number of pages||3|
|Publication status||Published - 2022|
|Event||2022 IEEE International Solid- State Circuits Conference (ISSCC) - Online at San Francisco, United States|
Duration: 20 Feb 2022 → 26 Feb 2022
|Name||Digest of Technical Papers - IEEE International Solid-State Circuits Conference|
|Conference||2022 IEEE International Solid- State Circuits Conference (ISSCC)|
|Abbreviated title||ISSCC 2022|
|City||Online at San Francisco|
|Period||20/02/22 → 26/02/22|
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