浮动式Boost DC-DC变换器共模噪声分析  

Analysis of Common Mode Noise in Floating Boost DC-DC Converters

作　　者：王一帆 刘雪山 奉榆杰 Wang Yifan;Liu Xueshan;Feng Yujie(College of Electrical Engineering Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电气工程学院,成都610065

出　　处：《电工技术学报》2025年第2期477-487,503,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(62371320)。

摘　　要：目前,针对非隔离型DC-DC变换器的共模噪声研究主要集中在通过运用噪声抵消、疏导等方法减小变换器的传导噪声,对于输出浮动式DC-DC变换器的共模噪声产生机理尚无明确的分析和研究。首先,该文通过分析输出浮动式Boost DC-DC变换器在正常工作状态下各节点对参考点之间的电位变化,得出输出浮动式Boost变换器高传导共模噪声的成因;其次,在考虑变换器各元件寄生参数的情况下,构建共模噪声等效模型并对其进行简化,分析不同噪声源引起的共模电流大小和方向;最后,搭建4台不同拓扑的实验样机,测试了各样机传导共模噪声的幅值并进行对比,验证了理论分析的正确性。Output-floating DC-DC converters are widely studied in new energy fields such as photovoltaics,fuel cells,and energy storage systems due to their high voltage gain.Taking the output-floating Boost DC-DC converter as the research object,this paper deeply analyzed the mechanism of common mode conducted noises and derived an equivalent model considering circuit parasitic parameters.Under the premise of adding a linear impedance stable network on the input side,the working mode analysis of four boost circuit topologies shows that the output-floating topology structure has three more high dv/dt nodes in the circuit compared to the input-output static point connection structure.With the switching state of the converter,the common mode noise current corresponding to these high dv/dt nodes can generate the common mode noise current flowing towards the ground on the flow path.A model of an output-floating Boost circuit topology was established,taking into account the equivalent series resistance and equivalent series inductance of the input and output capacitors of the converter,as well as the parasitic capacitance of the switching transistor.Based on the substitution theorem and Kirchhoff voltage law,a common mode noise model for an output-floating Boost converter was derived by equivalently replacing a normally operating device containing parasitic parameters with voltage and current sources of the same waveform.At the same time,using the superposition theorem,the common mode noise model was simplified by considering a single noise voltage or current source.Based on Kirchhoff’s current law,the common mode noise acoustic current flowing through the parasitic capacitance of each converter node under the action of a single noise source and the total mode noise current on the linear impedance stable network sampling resistor were derived.Four experimental prototypes with a rated power of 48 W were built.The output voltage,inductance current,and driving voltage were tested under 24 V input voltage working conditions.In a t

关 键 词：共模噪声 输出浮动式变换器 等效模型 寄生参数 

分 类 号：TM46[电气工程—电器]