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Point Field Detection-based Current Sensor Using Two-layer Shielding for Magnetic Crosstalk and Electric Capacitive Coupling

The sensing accuracy and bandwidth of current sensors are critical to the power converters' current regulation. In electric machine drive applications, point field detection-based current sensing methods are widely used because of galvanic isolation and simple setup. In a highly integrated three-phase power conversion system, the undesired magnetic field coupling and electric field coupling can introduce ripples, phase error, and amplitude error to the current sensors. This research proposed a two-layer shielding setup for the point field detection-based three-phase current sensing. The outer layer is to shield the phase-to-phase magnetic crosstalk. The inner layer is to shield the electric capacitive coupling between the sensor and the busbar. The performance of the proposed shielding setup is simulated with finite element analysis.