数字磁耦隔离器的磁场抗扰度评价方法研究

Electromagnetic compatibility evaluation of digital magnetic isolator

在电磁兼容测试领域,缺乏适用于数字磁耦隔离器的磁场抗扰度评价方法。针对此问题,研究数字磁耦隔离器的工作原理,基于电磁兼容原理和IEC等标准,建立一套基于GTEM小室法的针对数字磁耦隔离器的磁场抗扰度评价方法。搭建测试系统,设计电路板,采用测试座法解决抗扰测试中磁场耦合方向不正确和强度不足的问题,定义电平波动和固定0/1两种失效模式和判据,设计结构分析对照表。对GL1200P型号数字磁耦隔离器进行案例验证,验证测试方法可行性,确定器件抗扰失效敏感频率为113 MHz,评级为400 V/m—C级。案例验证说明该方法可以对数字磁耦隔离器抗扰度进行评价。

In the field of EMC testing,there is a lack of magnetic field immunity evaluation methods suitable for digital magnetic isolators.To solve this problem,the following studies were carried out.Firstly,the working principle of the digital magnetic isolator is studied.Based on the principle of electromagnetic compatibility and IEC standards,a set of evaluation methods for the magnetic field immunity of the digital magnetic isolator based on the GTEM small chamber method is established.The test system was built,the circuit board was designed,the test seat method was used to solve the problems of incorrect direction and insufficient strength of the magnetic field coupling in the disturbance rejection test,two failure modes and criteria of level fluctuation,and fixed 0/1 were defined,and the comparison table for structural analysis was designed.Second,the case of the GL1200P digital magnetic isolator was verified to verify the feasibility of the test method,and the device’s anti-disturbance failure sensitive frequency was determined to be 113 MHz,and the rating was 400 V/m—C.The case proves that this method can evaluate the immunity of digital magnetic isolators.