Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title A Study on Characteristics Analysis of Common-Mode Choke with Reduced Parasitic Capacitance
Authors Jae-Sun Won ; Hee-Seung Kim ; Jong-Hae Kim
DOI 10.6113/TKPE/2015.20.2.137
Page pp.137-143
ISSN 1229-2214
Keywords Common-mode choke; High frequency model of cm choke; Parasitic capacitance; Impedance characteristic; Multi-section type; EMI characteristic
Abstract This paper presents the intra capacitance modeling based on the winding method and section bobbin for CM choke capable of EMI attenuation of broad bands from lower to higher frequency bands and high frequency type common-mode choke capable of EMI attenuation of high frequency band used in the EMI Block of LED-TV SMPS. The case of high frequency type CM choke can be explained by the parasitic capacitance of three types of CM choke. The winding method of section bobbin type is smaller than the others. The first resonant frequency of the proposed CM choke tends to increase as the parasitic capacitance becomes small and its impedance characteristics improved performance as the first resonant frequency increases. The CM chokes of the proposed section bobbin type shows that in the future, the method may have practical use in LED/LCD-TV SMPS and in several applications, such as LED lighting, adapters, and so on.