Improving The Performance of Quadratic Boost Converter By Adding Auxiliary Inductor

Abstract

This paper suggests a new method to achieve input current ripple (ICR) reduction of the quadratic boost converter (QBC). The planned converter is represented by adding an auxiliary inductor connected in a series with the bootstrapping diode to a QBC. The benefit of this arrangement is to implement the interleaving concept to lessen ICR, while the quadratic concept is to attain the voltage gain within the required level. However, this modification will slightly affect the output voltage; the effect depends on two factors: the duty cycle and the auxiliary inductor value. The performance improvement includes increasing dynamic response speed, reducing reverse recovery and conduction losses in semiconductor devices and less oscillation observed by ICr, leading to better stability than the conventional converter. Therefore, the converter's overall efficiency is improved. A comparison with a typical QBC was presented using the LTspice program to demonstrate the improvement.