Common Mode Noise Reduction for Input-Parallel Output-Series Full-Bridge Converter Based on Noise Source Clamping
Song Meng1, Qin Suxin1, Zhu Zirui2, Liu Tao2, Wu Hongfei1
1. Center for More Electric Aircraft Power System Nanjing University of Aeronautics and Astronautics Nanjing 210016 China; 2. State Key Laboratory of Space Power-Sources Shanghai Institute of Space Power-Sources Shanghai 200245 China
Abstract：DC power systems with series and/or parallel-connected power modules have been widely used to achieve scalable voltage, current, and power ratings and improve the reliability of power systems. In high-voltage output scenarios, employing the output-series structure can reduce the voltage stress of the device. However, the series connection of the output rectifier circuits would deteriorate common-mode (CM) noise, thereby increasing the volume and cost of the power system due to the additional CM filter. This article focuses on the input-parallel output-series (IPOS) full-bridge converter. An improved topology of the IPOS full-bridge converter based on noise source clamping is proposed to solve the degraded CM noise issue caused by traditional output-series structures. The series connection of high-frequency rectifier circuits exacerbates dv/dt noise sources, leading to severe CM noise issues. By establishing the typical topology and CM noise model of the IPOS full-bridge converter, it is found that the noise source on the input side can be eliminated based on the cancellation principle. However, noise sources on the output side induce additional CM noise due to the superposition structure. Specifically, in the absence of the clamping of noise sources on the output side, when the voltage level of one noise source changes abruptly, it triggers voltage level changes in the noise source without clamping, thereby generating additional CM current. A stable reference ground for noise sources is constructed by adjusting the position of the output inductor. The system's differential mode (DM) filtering characteristics and output voltage ripples remain unchanged. The CM noise model of the improved topology is established, and no direct serial path exists between the equivalent noise sources. The noise sources are directly connected to the secondary ground in the CM equivalent model, suppressing the additional CM noise generated by the serial accumulation of noise sources in the traditional output-series structure. The proposed topology of noise source clamping mitigates the deterioration of CM noise. The principles of the proposed structure and CM noise model are analyzed. An experimental prototype of the two-phase IPOS full-bridge converter verifies the effectiveness of the proposed CM noise suppression method based on noise source clamping for the IPOS full-bridge converter.
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2025, Vol. 40 
