Improving the sensitivity of a PCB Rogowski coil current sensor with split-plate summation.

Area of Science:

• Electrical Engineering
• Sensor Technology
• Electromagnetics

Background:

• Printed circuit board (PCB) Rogowski coils offer advantages for high-frequency pulsed current monitoring, including wide bandwidth and saturation immunity.
• A key challenge is the inherent trade-off between optimizing bandwidth and enhancing sensitivity in these sensors.
• Existing designs often struggle to achieve both high sensitivity and wide bandwidth simultaneously.

Purpose of the Study:

• To design a high-sensitivity, wide-bandwidth current sensor based on PCB Rogowski coil technology.
• To analyze the structural parameters and develop an optimal design for improved performance.
• To propose and validate a novel method for enhancing sensor sensitivity and accuracy.

Main Methods:

• Analysis of the PCB Rogowski coil structure and its distribution parameter model.
• Selection of optimal sampling resistance and design of a second-order RC integration circuit.
• Investigation of key parameters (resistance, capacitance, coil turns, PCB thickness, coil dimensions) influencing performance.
• Development and testing of a multi-PCB Rogowski coil split-board output method.

Main Results:

• Optimal sampling resistance and a new second-order RC integration circuit were identified.
• Parameter analysis provided insights into optimizing PCB Rogowski coil design for bandwidth and sensitivity.
• Simulation and experimental results confirmed the effectiveness of the proposed split-board output method.
• The multi-PCB split-board method significantly improved sensitivity and measurement accuracy.

Conclusions:

• The developed PCB Rogowski coil sensor effectively addresses the bandwidth-sensitivity trade-off.
• The multi-PCB Rogowski coil split-board output method is a viable strategy for enhancing sensor performance.
• This research provides a foundation for designing advanced current sensors for demanding applications.