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Compensator Design for Closed Loop Hall-Effect Current Sensors

Kumar, Ashish and John, Vinod (2013) Compensator Design for Closed Loop Hall-Effect Current Sensors. In: National Power Electronics Conference, 20-22 December, 2013, IIT Kanpur, Kanpur, India.

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Closed loop current sensors used in power electronics applications are expected to have high bandwidth and minimal measurement transients. In this paper, a closed loop compensated Hall-effect current sensor is modeled. The model is used to tune the sensor's compensator. Analytical expression of step response is used to evaluate the performance of the PI compensator in the current sensor. This analysis is used to devise a procedure to design parameters of the PI compensator for fast dynamic response and for small dynamic error. A prototype current sensor is built in the laboratory. Simulations using the model are compared with experimental results to validate the model and to study the variation in performance with compensator parameters. The performance of the designed PI compensator for the sensor is compared with a commercial current sensor. The measured bandwidth of the designed current sensor is above 200 kHz, which is comparable to commercial standards. Implementation issues of PI compensator using operational amplifiers are also addressed.

Item Type: Conference Proceedings
Series.: Sixth
Additional Information: Copyright for this article belongs to IIT Kanpur
Keywords: Closed loop current sensors, Hall sensor, current probe, current sensor model, sensor compensation
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 03 Jan 2014 05:04
Last Modified: 05 Jan 2014 05:06
URI: http://eprints.iisc.ac.in/id/eprint/48129

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