An Interleaved Boost Converter With an Integrated Active Ripple Cancellation Filter

In this article, an interleaved boost converter with an integrated active ripple cancellation filter (IARCF) is presented, which is able to offer nearly duty-cycle-independent and switching-frequency-independent switching ripple cancellation capability. The inter-bridge positive coupling and inter-phase negative coupling of the integrated filter actively cancel the switching current ripple by generating mutual-inductance voltage to offset the switching voltage on the main inductor in a wide voltage range. An integrated magnetic core structure is proposed to implement the active filter, which is able to achieve partial flux cancellation and convert the ripple cancellation condition into adjusting the winding turn ratio, thereby making parameter matching easier. The accuracy of the theoretical analysis and the validity of the proposed converter and the magnetic core structure are verified by simulation and experimental results. Importantly, the proposed interleaving IARCF and magnetic core structure are versatile and can be readily applied to inverter and rectifier applications.