Tolerance Analysis of SEPIC DC-DC Converter

The paper presents tolerance analysis of SEPIC DC-DC converter. Based on a verified model, the influence of the accuracy of the magnetic components and the capacitors on the output indicators of the selected power electronic device is determined. In the study, the variation of the values of the elements was chosen to be performed in pairs, and due to the peculiarities of the power scheme the change of the inductors L1 and L2 is performed jointly, although a variant without magnetic coupling between them was chosen. Accurate quantitative assessment of this impact on the operating mode is presented in tabular form and through 3D graphs. In this way, the optimal selection of circuit elements is made at the design stage. The presented results are also useful for studying the stability and synthesis of optimal control of SEPIC DC/DC converter.