Analysis of input filter interactions in cascade buck converters

Iftikhar, Muhammad; Akin, Bilal; Sadarnac, Daniel; Lefranc, Pierre; Karimi, Charif

doi:10.1109/icit.2008.4608690

Cited by 2 publications

(2 citation statements)

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“…In addition, [37], [40] state that by using an LCL filter the total inductor value is less than that of L and LC filters as it is presented in this paper that there is a 45% inductor reduction with respect to the LC filter. Although [48], [49], [50] introduce the analysis of just LC filters considering the converter effect, they do not include the application and examination of input current ripple for DC-DC converters as given in this paper. Furthermore, as a limitation of the study, the open loop cascaded transfer function of both the filter and DC-DC isolated Ćuk converter have unstable Bode plots.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, some studies in the literature analyze the filter effect and its stability. For example, the effect of an LC filter on a DC-DC buck and boost converter by using Bode plots with small signal analysis and cascading the filter transfer function without applications in [48], [49] and with application for a DC-DC boost converter in [50] is examined. [51] analyzes the LC filter's effect on a DC-DC buck-boost converter by cascading converter and filter transfer function without application.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of LCL Filter Topologies for DC-DC Isolated Cuk Converter at CCM Operation

Şehirli

2022

IEEE Access

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In this study, the application and analysis of LCL filter topologies including an LCL, an LCL with damping, and an LCL trap filter used by a DC-DC isolated Ćuk converter operated at CCM are presented. The converter is designed for 50 W with 42 kHz switching frequency using a SiC MOSFET as a power switch. Although LCL filter topologies are commonly used with an inverter, their use in DC-DC converters has not been studied in detail. The main contribution of the paper is the application, design, and analysis of an LCL trap filter, which is not presented for a DC-DC converter in the literature, as an input filter of a DC-DC isolated Ćuk converter. For exact analysis of the effect of the filter, as a second main contribution of the paper, a state-space average mathematical model, small signal analysis of an isolated Ćuk converter for CCM operation, which was not presented before in the literature, is derived and its transfer function is obtained. In this paper, the practical design and transfer functions of LCL-based filter topologies are also presented. In order to analyze the effect of filter topologies by using linear methods including root locus and Bode graphs, the transfer function of the converter is cascaded with the transfer function of each filter separately, which is the third contribution of the paper because such analysis has not been presented in the literature. Furthermore, each cascaded transfer function and the transfer function of the converter are validated by step responses. All LCL filters, with an LC filter for comparison, are employed in the experimental setup. Owing to the applications, control characteristics and input current ripples are measured. In addition, the efficiencies of each different structure are determined. As a result of the analysis and measurements, the LCL trap filter gives better results in terms of efficiency (86%) and input current ripple (0.96 A peak). Moreover, the LCL with damping filter gives poorer control characteristics, but the maximum gain of the controller avoiding the instability of LCL with damping is 0.0855, which is higher than that of the others. Furthermore, it is shown that each LCL filter topology provides a 45% lower total inductor value compared to the LC filter.

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