A novel integrated CM inductor for parallel converters with interleaved carrier

Paralleling power converters increases the power rating and reliability of the overall system. Interleaving the carrier in parallel converters helps in reduction of output current distortion, and in reduction of EMI noise. This paper presents a common-mode inductor design for parallel interleaved converters, which integrates the inter-phase and boost inductors together in a novel structure. It is shown that the proposed magnetic structure accommodates a wider range of desirable electromagnetic parameters. Step by step design procedure to optimize the size and the weight of the proposed integrated common-mode inductor (ICMI) is presented. The design reduces the size and the cost of overall system. The proposed ICMI is compared with the design available in literature using a design example. It is shown that the existing design procedure imposes constraints on the core geometry that are not suitable for high power designs. The proposed design makes use of standard cores that improves manufacturability. Experimental results from a 7.5kW parallel single phase converter show the effectiveness of the proposed integrated common-mode inductor.