PWM方波边沿时间对机动车流量输出调节系统电磁辐射发射的影响  

Effect of edge time of PWM modulation signal on electromagnetic radiation of flow pump regulation system in vehicle

作　　者：王中[1,2] 赵士桢 郑拓[1,2] Wang Zhong;Zhao Shizhen;Zheng Tuo(Shanghai Institute of Measurement and Testing Technology,Shanghai Key Laboratory of Online Test and Control Technology)

机构地区：[1]上海市计量测试技术研究院 [2]上海市在线检测与控制技术重点实验室

出　　处：《上海计量测试》2023年第3期2-5,共4页Shanghai Measurement and Testing

基　　金：上海市市场监督管理局科技计划项目(2022-10)。

摘　　要：通过对PWM方波导致电磁辐射发射问题的机理进行分析,结合一款PWM控制的流量输出调节系统进行实验验证。结果表明,PWM方波边沿时间在0.01~100μs范围内,对流量输出调节系统在0.1~5 MHz范围内的辐射发射场强幅值影响较大,在100 kHz处最大差异超过30 dB。PWM方波电压幅值在5~16 V范围内,流量输出调节系统的辐射发射场强幅值没有受到明显的影响。通过研究,为涉及PWM控制产品的电磁兼容设计、整改优化等提供理论和技术支撑。The problem was analyzed that the near-field radiation disturbance caused by PWM signal,and verification was carried out with a pump regulation system controlled by PWM.When the PWM edgetime was within 10 ns and 100μs,there was significant difference of peak and average amplitude within 0.1-5 MHz,even more than 30 dB at 100 kHz;whereas there was no significant difference of Vtop amplitude within 5 V and 16 V.It may provide theoretical and technical support for EMC design and optimization.

关 键 词：脉冲宽度调制方波 边沿时间 电压幅值变化率 辐射发射 

分 类 号：O441[理学—电磁学] U463[理学—物理]