降低微型气相色谱仪检测器电路板工作温度的实验结果

Experimental results in lowering circuit board working temperature of micro gas chromatograph detector

在解决新设计的微型气相色谱仪检测器电路板工作温度较高的问题时,试图用强制风冷改善仪器机箱内的散热状况,并对此进行了仿真计算。但在实验过程中发现,加强风冷会导致模块运行时基线产生波动,进一步实验发现,这是因为加强风冷破坏了原有模块温度控制PID的条件所致。因此在本例中,强制风冷是不可行的。经仔细研究和测量,采用了两种新措施,一是将屏蔽盒下的变压器改换成电源芯片,二是在ADC引脚背面加上散热片。新措施成功地降低了电路板的工作温度。

For lowering the working temperature of circuit board in designing new micro gas chromatograph detector, forced air cooling was supposed to improve the heat dissipation in instrument cabinet, and a 3D model was simulated. But it was found in practical experiments that the forced air cooling led to the fluctuation of base line when the circuit board was working. The further experiments found that the cause was that the forced air cooling changed the working condition of temperature control module also. So in this case, the forced air cooling is not feasible. After careful stucly and measurement, two now measures were adopted. First, the transformer under the shielding box was replaced with a power chip, and secondly, a heat sink was added on the back of ACD pins. The circuit board working temperature was lowered successfully with the new measures.