LED车灯窄带辐射电磁干扰的研究

A Research on the Electromagnetic Interferences of Narrowband Radiation on Automotive LED Lights

在10m法暗室内，对汽车的全LED前组合灯进行了整车和部件在窄带辐射电磁干扰下的测试。结果表明，在频率20—220MHz范围内，LED照度随场强增加而衰减，整车测试的照度衰减大于部件测试的照度衰减；不同车灯的激亮频率和阈值不同，部件测试的激亮阈值大于整车测试。根据测试结果，建议对LED车灯采取窄带辐射抗干扰措施，以免引发错误信号，而对于LED车灯窄带辐射抗扰测试，采用整车测试比部件测试更合理。

The full LED front combination lamps are tested both in vehicle and as component alone in a 10- meter semi-anechoic chamber under a narrowband radiated electromagnetic interference. The results show that in a frequency range of 20-220MHz, LED illuminance reduces with the increase of electric field intensity, and the reduc- tion in illuminance in vehicle test is Xarger than that in component test. Different LED lamps have different lit fre- quencies and thresholds, and the lit thresholds in component test are higher than that in vehicle test. Based on test results, it is suggested that measures for the anti-interference of narrow-band radiation should be taken for automo- tive LED lamps to avoid false signals, and for narrowband radiated electromagnetic interference tests, vehicle test is preferable to component one.