Abstract:

The power switching devices of Buck converter will produce high du/dt during the switching process,which will resulte serious conducted common mode electromagnetic interference.To solve the above problems,the anti-phase winding method is proposed to suppress the conducted common mode noise of Buck converter.By analyzing the common mode noise suppression mechanism of the proposed method,the common mode noise suppression equivalent model considering the influence of high-frequency parasitic parameters and its insertion loss mathematical model are established,and the parameter design method of Buck converter anti-phase winding method is proposed accordingly.Taking a high-power industrial lighting LED driving power supply as the test object,the correctness and effectiveness of the proposed method are verified.The experimental results show that the anti-phase winding method can effectively suppress the conducted common mode noise of Buck converter.

Key words: anti-phase winding, common mode noise, insertion loss, electromagnetic interference(EMI)