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A new approach to measure the grid and load impedance of converters in-situ at frequency range 2k–150 kHz has been developed. It is called three-probe approach. This approach allows impedance measurements of power supplies and electric appliances without interrupting their normal operations. The measurement accuracy is improved by proper Fast Fourier Transform (FFT) process to obtain both amplitude...
In this paper an improved dual-probe approach is proposed to measure the source impedance of conducted EMI noise. Two-impedance method, which can reduce the influence of testing cable loss caused by high frequency, instead of short-circuit method is used to minimize the measurement errors of conducted EMI noise source impedance. A switched-mode power supply (SMPS) is taken to measure its conducted...
Based on a two-probe measurement approach, the noise source and noise termination impedances of a switched-mode power supply (SMPS) under its normal operating condition are measured. With the accurate noise source and noise termination impedances, an electromagnetic interference (EMI) filter can be optimally designed. A practical example of the design of an EMI filter to comply with a regulatory conducted...
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