高频热合机电磁辐射抑制技术的研究

Study on suppression technologies of the electromagnetic radiation of high frequency welder

根据国家电磁兼容标准(GB4824-2004-2A),针对传统高热合机在主频、二倍频和三倍频处的辐射强度严重超标的问题,结合高频热合机的工作原理对其电磁兼容性进行深入的研究,通过采取三种措施:1)在热合机机头部位设计制作谐振电路衰减器,通过建立陷波槽和反作用场的方法,削弱和吸收热合机机头强辐射电磁场,使电磁泄漏辐射场强得到衰减;2)采用电磁辐射屏蔽衰减技术,对高频功率的铜片馈线进行屏蔽;3)重新设计高频振荡电路,减少振荡输出的谐波分量。试验结果证明:采取对电磁辐射抑制措施后高频热合机的输出频率符合国家规定的频率标准,解决了目前高频热合机工作时的电磁泄露辐射污染问题,带来了很好的社会、环境和经济效益。

Based on the nation＇s electromagnetic compatibility standard （ GB4824-2004-2A ）, dealing with traditional high frequency welder＇s severely exceeding the standard in its radiant intensity of its basic fi＇equency, duplicate frequency and triplicate frequency, studies deeply on the electromagnetic compatibility with the help of the working principle of high frequency welder, and three measures come out： 1） to make a resonance circuit damper on the head of the hot-sealing machine , through the building of wave trap and choking field,to weaken and absorb the high radiant electromagnetic field ,thus to weaken the intensity of the radiant field made by electromagnetic leak ;2）to screen the high-frequency sheet copper feeder, using the technique of weakening and screening the electromagnetic radiation ;3 ）to redesign high-frequency oscillation circuit ,thus to decrease harmonic made by surge. The result shows that after the inhibition of electromagnetic radiation, the output frequency of high frequency welder accords with nation＇s prescriptive frequency standard. It solves the problem of radiation pollution made by electromagnetic leek when high frequency hot-sealing machine is working , and brings good social, environmental and economic benefits.