时域电磁探测发射机损耗及热分析设计

电磁探测技术广泛应用于矿产勘察、考古研究、环境安全检测等多个领域,而时域电磁探测技术更有着深度大、效率高、成本低的特点,有广泛的应用前景.针对常见的时域电磁探测系统发射功率大、损耗及热效能较大,如何降低损耗和热效能的问题,利用PLECS仿真软件操作简便、稳定性好、器件全面以及仿真速度快等优点,从理论上计算了全桥变换器逆变电路的损耗,设计了一种新型的时域电磁探测发射机的热仿真模型,分析了不可控制整流电路和全桥变换器逆变电路的平均损耗,并计算了高频变压器两侧散热器最大热阻值.实验仿真表明,该方法简单准确,可以有效防止散热器过度设计,提升系统设计效率和工作效率,确保系统稳定,为进一步搭建样机模型提供了热仿真基础,很大程度上缩短了搭建模型的试验过程.

Loss and thermal analysis and design of a time-domain electromagnetic detection transmitter

Electromagnetic detection technologies is widely used in mineral exploration, archaeological research, environmental safety testing and other fields. As one of the electromagnetic detection technologies, the time domain electromagnetic detection technology has characteristics of great depth, high efficiency and low cost, so it has a broad application prospect. Because of the great power of the time-domain electromagnetic detection system, the loss and thermal efficiency is large. How to reduce the loss and thermal efficiency has become the focus of the study. By using PLECS with multiple advantages, such as simple operation, good stability, well-equipped devices and fast simulation speed, the theory calculated the average loss of inverter circuits of full-bridge converters. Our study designed a thermal simulation model of time-domain electromagnetic detection transmitter. On this basis, this research analyzed the average loss of uncontrollable rectifier circuits and inverter circuits of full-bridge converters, and calculated the maximum thermal resistance value of radiators on both sides of a high frequency transformer. The simulation shows that the proposed method is simple and accurate. It effectively prevents the excessive design of radiators, improves the design efficiency of the system and ensures the stability of the system. Besides, it also provides a thermal simulation basis for further establishing a prototyping model and shortens the experimental process of the model establishment.