Abstract
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.
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