PERFORMANCE AND NOISE ATTENUATION MECHANISM OF NOISE-REDUCTION TRANSFORMER

This paper describes a fundamental study of noise reduction transforme rs with a filter function for electrical surge noise. Three kinds of p rototype noise reduction transformer are proposed. The noise attenuati on mechanism are discussed by experiments and by circuit analysis usin g spice. This is useful to determine a method for the optimum design o f the noise reduction transformer. The main results are as follows: (1 ) The noise attenuation of the prototype transformer is above -15 dB. (2) The leakage inductance and the stray capacitance are dominant fact ors to increase the noise attenuation.