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A virtual RLC damper to stabilize DC/DC converters having an LC input filter while improving the filter performance

Zhang, Xin, Zhong, Qing-Chang and Ming, Wen-Long ORCID: 2016. A virtual RLC damper to stabilize DC/DC converters having an LC input filter while improving the filter performance. IEEE Transactions on Power Electronics 31 (12) , pp. 8017-8023. 10.1109/TPEL.2016.2553786

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The LC filter at the input of a dc/dc converter may cause instability when the converter is controlled as a constant power load (CPL) and one of the effective solutions is to reduce the output impedance of the LC input filter with different stabilization dampers. In this letter, the impact of these dampers on the LC filter is analyzed with two-port network analysis and it is found that the existing dampers all degrade the performance of the original LC input filter to some extent. In order to overcome this drawback, an RLC damper is proposed to stabilize the whole system while improving the performance of the LC input filter. In addition, this RLC damper is also designed to achieve high robustness against the parameter variations of the LC input filter. Furthermore, in order to avoid the power loss when implementing the damper physically, a control strategy for the CPL is proposed to implement the RLC damper as a virtual RLC (VRLC) damper. The actual effectiveness of the VRLC damper and its impact on the CPL are fully evaluated via two-port network analysis as well. Finally, experimental results from a 100-W 48-24-V buck converter with an LC input filter are presented to demonstrate the proposed VRLC damper.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
ISSN: 0885-8993
Funders: Engineering and Physical Sciences Research Council, U.K.
Date of Acceptance: 8 April 2016
Last Modified: 02 Nov 2022 11:34

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