Design of improved double closed-loop controlled interleaved parallel buck circuit

In this paper, the control method and the improved topology of the interleaved parallel buck circuit are studied. Under the condition of large duty cycle, the traditional double-closed-loop control of voltage and current are used to make the output of the system more stable. Then, the discrete inductors are merged into a coupling inductance in the interleaved parallel buck circuit, to reduce the output current ripple and improve the dynamic characteristics and meet the increasing requirement of power density of the system. The simulation results indicate that the coupling coefficient and the double closed-loop control have specific influences on the circuit performance, which verifies the proposed design scheme.