Visualization of noise current propagation in a power module with scanning time-synchronized near magnetic field measurement

Abstract

This study investigates noise current propagation in a power module accompanied with its switching operation. The noise current can be estimated from the measured near magnetic field. The proposed measurement system is developed to identify the time-dependent near magnetic field distribution in a power module. The system scans near magnetic field spatially and acquires its time-synchronized frequency spectrum. Propagation of the noise current in the power module is visualized as a time series of the noise current spectrum distribution in the power module. The developed system can help realize electromagnetic compatibility (EMC) design of a power module.

Application of Frequency-Domain Noise-Source Model to Simulation of Time-Synchronized Near-Magnetic-Field Distribution above a Power Circuit

“…EMI noise of an integrated circuit is analyzed in [10] and [11], while that of a power circuit is analyzed in [12]- [16] and [18]- [23]. The authors of [22] and [23] developed a measurement system for the timesynchronized near-magnetic-field distribution. A near-magneticfield distribution map for a specific time and frequency can be visualized by the measurement system.…”