基于Icepak的点火电路热分析

Thermal Analysis of Ignition Circuit Based on Icepak

点火电路的特点是工作时间短、瞬时电流大、可靠性要求高,其中接插件导线和PCB走线的设计,一般是以稳定工作电流为基准并加以修正确定相关参数,但结果偏差大。针对点火电路实际工作工况与设计工况不一致的问题,利用Icepak对某点火电路的接插件导线和PCB走线在短时间、大电流工作时的温度场进行了数值模拟,研究了导线横截面参数对导线温升的影响。研究结果显示,载流为6 A时,PCB走线宽为0.8 mm,厚为70μm为宜,接插件导线截面积选用0.12 mm 2即可,并且电路的可靠性很高。针对点火线路中导线参数的确定,提出了从热力学角度进行研究并进行数值模拟仿真的方法,给产品的设计提供了数据支持。

Ignition circuit is characterized by short working time,large instantaneous current and high reliability.The design of conductor wire and PCB routing is generally based on the stable working current and corrected to determine relevant parameters,but the result deviation is large.In order to solve the inconsistency between the actual working condition and the design working condition of the ignition circuit,the temperature field of the conductor wire and PCB routing of an ignition circuit was numerically simulated based on Icepak and the influence of the cross-section parameters on the temperature rise of the wire was studied.The results show that when the current carrying capacity is 6 A,the optimal PCB routing width is 0.8 mm,the thickness is 70μm and the cross-section area of the connector wire is 0.12 mm 2.At this time,the circuit reliability is very high.A thermodynamics research and numerical simulation method is put forward to determine the wire parameters in ignition circuit.It provides data support for product design.