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 principal structural component of motor drive systems is among the main tasks for developers. Wideband gap power semiconductors such as for instance SiC and GaN are anticipated to feature smaller passive components due to raised switching frequencies and lower loss as a result of low ON-resistance, thus leading for their use.
The switching frequency of inverters designed with power semiconductors will continue steadily to heighten, which will necessitate power measurement at even wider bandwidths and higher precision. This informative article discusses the main element features of 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 Using the Current Sensor Method
To be able to achieve high precision power measurement with high repeatability utilising the current sensor method, it is very important to use the following standards as conditions for selecting the right current sensor [1].
(1) The rated current of the present sensor matches the existing degree of the DUT.
(2) The DUT's switching frequency of the current and every one of the frequency components including harmonics are within the measurable frequency bandwidth of the current sensor.
(3) Measurement accuracy of the present sensor is defined across its entire measurable frequency bandwidth, and that the accuracy is sufficiently high.
(4) Uncertainty regarding the present sensor's output noise, temperature characteristics, the effectation of conductor position, the aftereffect of external magnetic fields, magnetic susceptibility, the effect of common-mode voltage, etc., are clearly defined and sufficiently small.
Specifically, it is important to see that pertaining to condition (3), many general current sensors define accuracy solely for DC and 50/60Hz signals, while accuracy for all the frequencies is only stated for typical reference. While using the current sensor method to measure power with high precision, attention must certanly be paid to pick both an electrical analyzer [2] and the existing sensor that exhibit the appropriate performance levels.
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