PCB-Embedded Spiral Pattern Pick-Up Coil Current Sensor for WBG Devices

This paper proposes a current sensor for wide bandgap (WBG) devices. The current of a power semiconductor device is mainly measured using a Rogowski coil, an active current transformer, and a coaxial shunt resistor. The Rogowski coil and active current transformer are not suitable for the current measurement of surface mount WBG devices due to their operating principle. The coaxial shunt resistor causes parasitic inductance. Since WBG devices are more sensitive to parasitic inductance than silicon devices, parasitic inductance may affect circuit operation. To overcome these problems, this paper proposes a printed circuit board (PCB)-embedded spiral pattern pick-up coil current measurement for WBG devices. The proposed pick-up coil has high mutual inductance compared to the conventional pick-up coil, so the measurement sensitivity is high. In addition, there is no need for additional processing outside the PCB. Experimental results using a double pulse tester circuit are provided to verify the performance of the proposed current sensor.

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Rogowski Coil for Current Measurement in a Cryogenic Environment

Measurement Science Review ◽

10.1515/msr-2015-0012 ◽

2015 ◽

Vol 15 (2) ◽

pp. 77-84 ◽

Cited By ~ 1

Author(s):

Tao Ma ◽

Shaotao Dai ◽

Jingye Zhang ◽

Lianqi Zhao

Keyword(s):

Output Voltage ◽

Rogowski Coil ◽

Measurement Precision ◽

Current Measurement ◽

Current Sensor ◽

Coil Current ◽

Large Bandwidth ◽

Current Sharing ◽

Primary Current ◽

Better Than

Abstract A Rogowski coil based sensor for current measurement in a cryogenic environment and results of its application for paralleled high temperature superconducting (HTS) coil current sharing are presented. The current sensor consists of a Rogowski coil and an integrator, where the coil output voltage is proportional to the derivative of primary current and the integrator transfers the differentiation to normal state. The Rogowski coil has promising applicability at cryogenic circumstance because its body is made of low temperature materials. The integrator ensures a large bandwidth with feasible magnitude, which is vital for dynamic current measurement during the quench of the HTS coil. The proposed current sensor is used for current sharing measurement of two paralleled Bi2223 HTS coils, and the experimental results show that the measurement precision is better than 0.5%.

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PCB-Based Current Sensor Design for Sensing Switch Current of a Nonmodular GaN Power Semiconductor

Energies ◽

10.3390/en13195161 ◽

2020 ◽

Vol 13 (19) ◽

pp. 5161

Author(s):

Ui-Jin Kim ◽

Min-Soo Song ◽

Rae-Young Kim

Keyword(s):

Transient Response ◽

Printed Circuit Board ◽

High Efficiency ◽

High Sensitivity ◽

Power Converter ◽

Rogowski Coil ◽

Circuit Board ◽

Current Sensor ◽

Measurement Sensitivity ◽

Power Semiconductor

GaN-based power semiconductors exhibit small on-resistance and high dv/dt of the switch characteristics, thereby enabling the construction of high-efficiency, high-density semiconductor systems with fast switching and low power loss characteristics and miniaturization of passive devices. However, owing to the characteristics of GaN devices that result in them being significantly faster than other devices, the accuracy of the switching transient response significantly affects the noise or inductance in the device. Therefore, securing sufficient sensor bandwidth is considerably important for accurate current measurement in GaN-based devices. Conversely, the current sensor in the form of a non-insulated coil must secure sufficient bandwidth and overcome the tradeoff relationship with measurement sensitivity; moreover, the sensor configuration must be applicable to various power semiconductor types. This study proposes a current sensor model that applies the principle of the printed circuit board Rogowski coil to a surface mount device-type GaN-based half-bridge structure. This structure is applicable to a nonmodular power converter and is designed to secure sufficient bandwidth with a minimum area while simultaneously exhibiting high sensitivity. For the coil design, mutual inductances with existing coil structures were compared and analyzed, and the frequency response and magnetic analysis were evaluated. Experimental verification was performed and the transient response characteristics in various DC voltage ranges are discussed.

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Design and Analysis of PCB Rogowski Coil Current Transformer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.672-674.984 ◽

2014 ◽

Vol 672-674 ◽

pp. 984-988

Author(s):

Biao Su ◽

Li Xue Li ◽

Yi Hui Zheng ◽

Xin Wang ◽

Yan Liu ◽

...

Keyword(s):

Power System ◽

High Sensitivity ◽

Current Transformer ◽

Rogowski Coil ◽

Electromagnetic Current ◽

Current Transformers ◽

Coil Current ◽

Electronic Current ◽

Rogowski Coils ◽

Electronic Current Transformers

Electronic current transformers are more suitable for the development of power system compared with traditional electromagnetic current transformers. Rogowski coil current transformer is one of three electric current transformers. According to the measurement principle of Rogowski coils, the equivalent circuit of PCB Rogowski coils is analyzed. By using four PCB Rogowski coils combined, a PCB Rogowski coil current transformer is designed and tested. The results show that the designed PCB Rogowski coil transformer has good linearity and high sensitivity and measurement accuracy and it can meet the requirement of power system.

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