Analysis of Inductor Peak Current Based on the Quadratic Buck-Boost Converter with Switched Inductor Network in the Entire Dynamic Range

Abstract

According to the working principle of the proposed quadratic Buck-Boost Converter with Switched Inductor Network, the converter is divided into continuous conduction mode (CCM) and discontinuous conduction mode (DCM) according to whether the minimum current flowing through the inductor L3 is equal to zero. Subsequently, the inductor peak current in the two modes are derived. Based on the quadratic Buck-Boost Converters with Switched Inductor Network, a entire dynamic range inductor peak current analysis method is proposed within a given input voltage and load range. Meanwhile, In terms of different value ranges of the inductor L3, the working area of the converter is divided into three parts, and the maximum inductor peak current in the three working conditions are compared. By analyzing the relationship between the maximum inductor peak current and the value of the inductor L3, it is concluded that L3 = L3CA is the critical inductance at which the maximum inductor peak current of the converter reaches the minimum in the entire dynamic range. Finally, the experimental results demonstrate the reasonability and correctness of the proposed theoretical analysis.