射频治疗仪电磁兼容整改

一、行业类别:医疗器械

二、电磁兼容标准YY0505-2012GB9706.4

三、产品名称:射频治疗仪

四、EMC电磁兼容问题要点:

射频治疗仪产品在实施电磁兼容项目时,产品在辐射发射(依据GB9706.4专标要求待机状态)、浪涌和电快速脉冲群等三项电磁兼容测试结果不符项YY0505-2012测试要求。

辐射发射:31MHz38 MHz58 MHz174 MHz等频率段不符合CLASS A限值要求。

脉冲群:产品在实施脉冲群干扰时,显示屏闪烁。

浪涌:产品在实施浪涌时,射频输出功率受影响。

五、电磁兼容评估与分析

在对产品实施脉冲群、浪涌等抗扰度测试,易导致显示屏CLK的电平信号呈高低电平状态,因而出现闪屏或黑屏现象。浪涌泄放电流干扰射频反馈信号或功率调节信号,从而导致功率异常。

辐射发射:主要存在31MHz38 MHz58 MHz174 MHz等频率段超标,主要是直流电源输出线、射频线等相关互连线缆形成天线效应,导致辐射发射在上述频段超标。

六、EMC电磁兼容整改方案

1DETECTION信号两端加RC滤波;

2、在RXD2\TXD25欧电阻,对GND102电容;

3R83\R780欧电阻换成10欧;

4、12VGND102+104, 即在C52的基础上加102电容;

5、AC输入端与隔离变压器之间串一个电源滤波器。

6、射频信号与控制信号做好隔离,切勿相互并行。

七、电磁兼容整改测试结果对比

辐射发射整改前

辐射发射整改后



以上是我公司电磁兼容整改方案原创文本,未经授权请勿它用。

如需技术交流或电磁兼容测试整改,敬请致电18612045558(张先生)或400-687-1580详细沟通。


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