Abstract
This paper presents the overall concept of a wideband and cost-effective current sensor. The sensor consists of a paralleled Hall-based current sensor (LEM) and a wideband current transformer (CT). A significant improvement of the band range and the moderate cost of the proposed sensor enable it to be used both to measure the instantaneous value in order to precisely plot the current and to obtain signals for a closed-loop control system of high-frequency power electronic converters. The sensor should be considered as an Augmented LEM Current Sensor (ALCS), which allows it to measure low- and high-frequency current signals. Finally, it allows for the measurement of a bipolar current up to 40 A. The overall cost of the sensor, along with the previously mentioned benefits, is an important feature of the proposed sensor. The present paper presents the analytical concept of the sensor (ALCS), a theoretical approach using simulation analysis, and the experimental results, which clearly demonstrate the wide range of the sensor in dynamic and static measurements.
Highlights
The sensor should be considered as an Augmented LEM Current Sensor (ALCS), which allows it to measure low- and high-frequency current signals
Comparing the current transformers and current shunt resistors, it can be concluded that both Current shunt resistors (CSR) and High-Frequency Current Transformers (HFCTs) have wide transmission bands, which allow them to be used to measure the currents in power electronic systems [9]
Where n is the number of turns, R Fe is the resistance representing the losses in the core, RCu is the resistance representing the losses in copper, and Rm is the measuring resistor
Summary
The LEM sensors provide galvanic isolation and allow for the measurement of bipolar currents. A current transformer has been added to the LEM sensor order to transfer fast-changing current components. The entire measuring system will The output signals will be summed in an analog circuit to produce a bipolar voltage signal consist of two sensors (LEM + CT) and provide two current measurement signals. The sensor transmittance Hsensor (s) will consist of output signals will the be sum summed in anHLEM analog circuit to produce a bipolar voltage signal of the LEM the current transformer. CT (s) transmittances: Before the summation signals, the gains of the measure(s) =operation. TLEM s+1 sensor, an RC low-pass filter (HRC (s)) was introduced (Figure 1), whose gain andtime shift constant characteristics significant: The values of the
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