一种半桥谐振变换拓扑变压器最大磁感应强度的测试方法  

A Testing Method for Maximum Magnetic Induction Intensity of Half Bridge Resonant Transformer Topology

作　　者：鞠耀武 邹学军 JU Yaowu;ZOU Xuejun(SELF Electronics Co.,Ltd.,Ningbo 315103,China)

机构地区：[1]赛尔富电子有限公司,浙江宁波315103

出　　处：《中国照明电器》2025年第2期54-56,共3页China Light & Lighting

摘　　要：变压器是开关电源的核心部件,其工作状态影响开关电源的可靠性,变压器最大磁感应强度是否小于磁芯的饱和磁感应强度,是评价开关电源可靠性的关键指标。本文通过对半桥谐振开关电源的变压器相关磁路公式进行推导,得出可以通过示波器测试变压器绕组两端电压的波形和大小,再利用示波器本身带有的积分运算功能,得到变压器的伏秒积,伏秒积等同于变压器的工作磁通链,这个工作磁通链的最大变化量除以该线圈的匝数得到的商再除以磁芯的有效截面积,最后再乘以0.5就得到了该变压器的最大磁感应强度。该方法便捷、高效、可靠,适合开关电源的可靠性评估。The transformer is the core component of a switching power supply,and its working state affects the reliability of the switching power supply.Whether the maximum magnetic induction intensity of the transformer is less than the saturation magnetic induction intensity of the magnetic core is a key indicator for evaluating the reliability of the switching power supply.This article derives the magnetic circuit formula related to the transformer of a half bridge resonant switching power supply,and concludes that the waveform and magnitude of the voltage at both ends of the transformer winding can be tested by an oscilloscope.Then,using the integration function of the oscilloscope itself,the voltage second product of the transformer can be obtained.The voltage second product is equivalent to the working magnetic flux chain of the transformer.The quotient obtained by dividing the maximum change of this working magnetic flux chain by the number of turns of the coil is divided by the effective cross-sectional area of the magnetic core,and finally multiplied by 0.5 to obtain the maximum magnetic induction intensity of the transformer.This method is convenient,efficient,and reliable,suitable for the reliability evaluation of switch mode power supplies.

关 键 词：最大磁感应强度 饱和磁感应强度 磁芯的有效截面积 磁通链 

分 类 号：TM13[电气工程—电工理论与新技术]