A ±25A Versatile Shunt-Based Current Sensor with 10kHz Bandwidth and ±0.25% Gain Error from -40°C to 85°C Using 2-Current Calibration
| Autor: | Tang, Z., Brito Zamparette, R.L., Furuta, Yoshikazu, Nezuka, Tomohiro, Makinwa, K.A.A., Fujino, Laura C. |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Zdroj: | 2022 IEEE International Solid-State Circuits Conference (ISSCC): Digest of technical papers 2022 IEEE International Solid-State Circuits Conference (ISSCC) |
| ISSN: | 0193-6530 |
| Popis: | 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) [1]–[4]. 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. |
| Databáze: | OpenAIRE |
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