An evaluation platform for the CM noise suppression characteristics of high-frequency transformer was established,which was suitable for batch applications in engineering. The conduction mechanism of common-mode(CM) noise in a transformer was analyzed,and the conduction characteristics of CM noise along the coupling path in the transformer was investigated for evaluating the transformer's capability of suppressing the CM noise. First,a function generator was used to generate a high-frequency voltage pulsation signal,which was assigned on the primary winding of the transformer to simulate the transmission characteristics of CM noise. Then,an oscilloscope was used to capture the voltage drop generated by the CM signal on the sampling resistor to judge the suppression effect of the transformer on the CM noise,so as to analyze the influence of the sampling resistor selection on the evaluation results. The effectiveness of the proposed evaluation method for the CM noise suppression characteristics of transformer was verified by comparing the evaluation results with the test results of conducted electromagnetic interference spectrum.
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