Influence of high frequency loss in an accumulating choke of boost power factor correction conventers under using of non-filter cancellation of conductive noise

Abstract

In the paper, the influence of high frequency loss in a real accumulating input choke (AIC) of boost power factor correction converters on the capacitance in the circuit of converter’s parasitic capacitance cancellation is considered. The parasitic capacitance mentioned above causes the spreading of noise CM voltage generating by a converter, into a main. Under the studying of high frequency loss influence in the AIC it was analyzed the equivalent circuit of the converter containing the real AIC (with parasitic winding capacitance and high frequency loss) as a source of CM noise. The expression for the optimal capacitance which provides minimization of converters common mode noise was obtained, and correctness of the said expression was checked with the aid of PSPICE. The simulation confirmed the correctness of the expression mentioned above. As a result of investigations carried out and described in the paper it is estimated that for real values of the AIC parasitic parameters the optimal capacitance does not practically depend on its high frequency loss.