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减少功耗芯片散热器的辐射是PCB板电磁兼容设计必须解决的问题之一。文中建立了铝制带鳍散热器物理模型,应用有限元法分析了芯片与散热器间能量耦合机理,鳍叶走向、激励源施加方向的改变对散热器辐射方向的影响,研究了屏蔽板最佳尺寸、放置位置对辐射的抑制效果。计算结果表明:制约散热器主辐射方向的是激励源施加方向,与鳍叶走向无关。正确放置的屏蔽板越长,放置位置离散热器越近,对辐射抑制越有利;屏蔽板理想高度是与散热器等高:散热器辐射强度与屏蔽板厚度无线性关系,取值与鳍叶等厚是合理选择。
Reduce the power consumption of the chip radiator radiation PCB design is one of the issues must be solved electromagnetic compatibility. The physical model of aluminum finned radiator is established in this paper. The influence of the energy coupling mechanism between the chip and the radiator, the direction of the fin and the direction of the excitation source on the radiation direction of the radiator are analyzed by finite element method. Good size, placement of radiation on the inhibitory effect. The calculation results show that the direction of the excitation source is restricted by the main radiation direction of the radiator, which has nothing to do with the direction of the fin. The longer the shielding plate is placed correctly, the closer it is placed to the radiator, the more advantageous to the radiation suppression. The ideal height of the shielding plate is the height of the radiator: the radiation intensity of the radiator has no linear relationship with the thickness of the shielding plate, Equal thickness is a reasonable choice.