Development of a Wideband High-Precision Current Sensor



In the field of power electronics, especially within the automotive and railway segments, the miniaturization and heightened efficiency of inverters that

In the field of power electronics, especially within the automotive and railway segments, the miniaturization and heightened efficiency of inverters that represent the primary structural component of motor drive systems is among the most important tasks for developers. Wideband gap power semiconductors such as for instance SiC and GaN are likely to feature smaller passive components due to higher switching frequencies and lower loss because of low ON-resistance, thus leading for their use.

The switching frequency of inverters designed with power semiconductors will continue to heighten, which will necessitate power measurement at even wider bandwidths and higher precision. This information discusses the main element options that come with a recently developed wideband high-precision current sensor and provides performance comparisons with competing products.

Classification of Current Sensors by Principle of Operation

High Precision Power Measurement Utilising the Current Sensor Method

To be able to achieve high precision power measurement with high repeatability utilising the current sensor method, it is important to use the following standards as conditions for selecting the appropriate current sensor [1].

(1) The rated current of the present sensor matches the existing amount of the DUT.

(2) The DUT's switching frequency of the present and all of the frequency components including harmonics are within the measurable frequency bandwidth of the existing sensor.

(3) Measurement accuracy of the current sensor is defined across its entire measurable frequency bandwidth, and that the accuracy is sufficiently high.

(4) Uncertainty with respect to the existing sensor's output noise, temperature characteristics, the aftereffect of conductor position, the effect of external magnetic fields, magnetic susceptibility, the effectation of common-mode voltage, etc., are clearly defined and sufficiently small.

Particularly, it is important to note that pertaining to condition (3), many general current sensors define accuracy solely for DC and 50/60Hz signals, while accuracy for other frequencies is stated for typical reference. While using the current sensor solution to measure power with high precision, consideration must be paid to choose both an electrical analyzer [2] and the present sensor that exhibit the appropriate performance levels.

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