温差电器件内阻影响因素分析  

Analysis of influence factors of internal resistance of thermoelectric parts

作　　者：孙夏爽 段玥晨[1] 杨号南 SUN Xiashuang;DUAN Yuechen;YANG Haonan(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou Henan 450001,China;Henan Institute of Intelligent Manufacturing,Zhengzhou Henan 450001,China)

机构地区：[1]郑州大学机械与动力工程学院,河南郑州450001 [2]河南省智能制造研究院,河南郑州450001

出　　处：《电源技术》2021年第11期1505-1509,共5页Chinese Journal of Power Sources

摘　　要：温差电器件工作过程中可以看作一个电源,其电源内阻随负载电阻变化而变化。目前很多学者做温差电器件分析过程中忽略这一因素,将内阻看作一个定值。利用有限元软件COMSOL对温差电器件进行仿真,分析温差电器件内阻的影响因素及内阻变化对温差电器件转换效率和输出功率的影响。结果表明,随着负载电阻减小,电路电流增大,热电偶的内阻会逐渐增加,当电流达到20 A时,电源内阻可增大6.5%。热电臂尺寸因子的改变对温差电器件内阻影响很大,冷热端温差的改变对温差电器件内阻影响较小。Thermoelectric element can be regarded as a power supply in the working process,and the internal resistance of the power supply is changed with the change of the load resistance.At present,many scholars ignore this factor in the analysis of thermoelectric parts and regard the internal resistance as a fixed value.The finite element software COMSOL is used to simulate the thermoelectric device,and the influencing factors of the internal resistance of the thermoelectric device and the influence of the change of the internal resistance on the conversion efficiency and output power of the thermoelectric device are analyzed.The results show that with the decrease of the load resistance and the increase of the circuit current,the internal resistance of the thermocouple will increase gradually.When the current reaches 20 A,the internal resistance of the power supply can increase by 6.5%.The change of size factor of thermoelectric arm has great influence on the internal resistance of thermoelectric parts,while the change of temperature difference between hot and cold ends has little influence on the internal resistance of thermoelectric element.

关 键 词：温差电器件 COMSOL仿真分析 电源内阻 尺寸因子 温差 

分 类 号：TM913[电气工程—电力电子与电力传动]