A Duty-Cycled Integrated-Fluxgate Magnetometer for Current Sensing

Garcha, Preet; Schaffer, Viola; Haroun, Baher; Ramaswamy, S.; Wieser, James B.; Lang, Jeffrey H.; Chandrakasan, Anantha P.

doi:10.1109/jssc.2022.3156572

Cited by 12 publications

(10 citation statements)

References 13 publications

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“…Except for FG (which can be considered as the most linear and accurate magnetic-based current sensor [ 9 , 13 , 28 , 54 ]), most magnetic-field detectors have linearity limitations due to their physics (especially HE and AMR [ 28 ]). Moreover, the output of a current sensor should be free of noise when it comes to accuracy, as noisy readings tend to indicate inaccurate measurements.…”

Section: Current Sensor Integration Concerns In Wbg Power Electronicsmentioning

confidence: 99%

“…The reason for this is that micro-FG sensors require compensation current to equilibrium magnetic fields within its magnetic core to attain a high degree of linearity. Since on-chip FG may need high powers, they are not suitable for loss-limited conditions, particularly in applications related to the Internet of Things (IoT), but according to [ 54 ], they designed and implemented an FG IC with only 13 mW power consumption for those applications.…”

Section: Current Sensor Integration Concerns In Wbg Power Electronicsmentioning

confidence: 99%

“… Potential bandwidth of different current-sensing methods [ 9 , 11 , 12 , 13 , 14 , 18 , 19 , 20 , 21 , 52 , 53 , 54 , 55 ]. …”

Section: Figurementioning

confidence: 99%

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Current Sensor Integration Issues with Wide-Bandgap Power Converters

Sirat

Parkhideh

2023

Sensors

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Precise current sensing is essential for several power electronics’ protection, control, and reliability mechanisms. Even so, WBG power converters will likely struggle to develop a single current-sensing scheme to measure various types of currents due to the limited space and size of these devices, the required high sensing speed, and the high electromagnetic interference (EMI) emissions they cause. Analysis of existing current sensors was conducted in such terms with the objective of understanding the challenges associated with their integration into WBG power converters. Since each of these requirements has different design tradeoffs, it is challenging to consider one specific method of current sensing to be perfect for all situations; thus, the possibility of developing novel methods to improve the performance of these single-scheme current sensors is further explored.

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Section: Current Sensor Integration Concerns In Wbg Power Electronicsmentioning

confidence: 99%

Section: Current Sensor Integration Concerns In Wbg Power Electronicsmentioning

confidence: 99%

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Current Sensor Integration Issues with Wide-Bandgap Power Converters

Sirat

Parkhideh

2023

Sensors

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“…We added a fully integrated 3D anisotropic magnetoresistance (AMR) magnetometer [21], and a fully integrated tunneling magnetoresistance (TMR) magnetometer [22]. The next group consisted of fluxgates: a commercial fully integrated device [23], a recent academic prototype with the coil on a separate chip [24]. We added a 3D magneto-impedance (MI) sensor [25], partially integrated with 3 coils off-chip, and treated it as part of the fluxgate category.…”

Section: A Device Selectionmentioning

confidence: 99%

A Benchmark of Integrated Magnetometers and Magnetic Gradiometers

Brajon,

Gasparin,

2023

IEEE Access

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This survey paper compiles and benchmarks the performance of integrated magnetic sensors, in terms of their noise and full-scale magnetic field. In total, we collected performance metrics of 31 sensors realized in various technologies. For each sensor, we derived a noise model to estimate the noise under the same conditions. We obtained a comprehensive benchmark with a focus on integrated devices. We also measured the noise spectrum of 11 of those sensors to confirm our noise model. Given that for many emerging applications, such as tactile, current, torque and biomagnetic sensing, the signal of interest is the field gradient to reject magnetic stray fields, we extended the benchmark to gradiometers. We developed a low-noise measurement setup and a low-field gradient (full scale: 10 μT/mm) generation setup to characterize magnetic gradiometers in this regime. The paper discusses the key sensor trade-off between precision and range, and summarizes the technology trends graphically on a trade-off curve, providing broad insight.

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“…separate integrated devices, and calibration is required before use. The off-chip current sensing methods mentioned above all require additional devices to implement and cannot be highly integrated, which increases the cost and area of the system [7][8][9][10]. The MOSFET RDS(on) method requires no additional devices or circuit structures, enabling simple and low-cost current detection [4].…”

Section: Introductionmentioning

confidence: 99%

An On-chip Integrated Current Sensing Technology for Real-time Detection of Phase Current in BLDC Motors

Wen,

Wang

2023

PIER M

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This paper presents an on-chip integrated sensing circuit for real-time detection of phase currents in three-phase brushless direct current (BLDC) motors. The three-phase sinusoidal currents generated in the motor winding are detected by an innovative Sense FET technology, which can accurately measure the currents of high side and low side power transistors simultaneously. A dynamic matching elimination method is proposed for the detection current mismatch problem due to the large difference in aspect ratio. Using a 90 nm BCD process for design and verification, the detection circuit of the high side and low side can well follow the change of sine wave phase current of the three-phase motor. The detection accuracy is above 96%, and the best accuracy can reach 99.219%. The elimination effect of circuit current mismatch is obvious, and the error of the sensing current can be reduced by 38.9%.

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A Duty-Cycled Integrated-Fluxgate Magnetometer for Current Sensing

Cited by 12 publications

References 13 publications

Current Sensor Integration Issues with Wide-Bandgap Power Converters

Current Sensor Integration Issues with Wide-Bandgap Power Converters

A Benchmark of Integrated Magnetometers and Magnetic Gradiometers

An On-chip Integrated Current Sensing Technology for Real-time Detection of Phase Current in BLDC Motors

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