4.8 Article

Common-Mode Noise Reduction and Capacitor Voltage Auto-Balance Using Bridged Midpoints and Coupled Inductor in a 3-L Buck-Boost Converter

Journal

IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 38, Issue 10, Pages 12365-12369

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2023.3296335

Keywords

Buck-boost converter; common-mode (CM); coupled inductor; dc-link capacitor; electromagnetic interference (EMI); Input-output midpoint interconnection; multilevel; voltage balancing

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This letter presents a method to further reduce common-mode noise and achieve DC voltage auto-balance in a symmetric three-level buck-boost converter. By connecting the input and output midpoints, the noise can be trapped inside the power converter, resulting in a significant reduction in common-mode noise. Additionally, a combination of bridged midpoints and coupled buck-boost inductor allows the converter to achieve the desired DC voltage auto-balance feature.
The symmetry principle has been widely used to mitigate the power stage common-mode (CM) emissions. Based on a symmetrical three-level (3-L) buck-boost converter in [1], this letter finds a midpoints interconnection that can reduce the CM noise further and realized the dc-link voltage auto-balance at the same time. By bridging the input and output midpoints, the noise is trapped inside the power converter and a 30 dB CM noise reduction is achievable on the line impedance stabilization network (LISN) side. Also, a combination of bridged midpoints and coupled buck-boost inductor grants the converter with a desirable dc-link capacitor voltage auto-balance feature. Furthermore, uniquely the voltage ratio between the split dc-link capacitors is tightly related to the turn ratio of the coupled inductor, meaning the auto-balance nature is valid also for asymmetrical dc-link voltage cases. Detailed modeling and analysis are provided in this letter to explain the observations. All the analyses are verified on a custom built SiC-based 30 kHz 50 kW prototype. This letter is accompanied by two videos to visualize the discussed voltage balancing feature.

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