Thermal Analysis And Virtual Wiring For High Frequency Auxiliary Power

During the design of electrical product, the components’layout has a directly effect on ventilation and heat dissipation as well as wiring of the equipment, and then affects device performance. Therefore the research of the method to evaluate the rationality of for components’layout plays an important role in promoting improvement of quality and efficiency of design.This paper proposes that evaluating the rationality of the components’layout design from the ventilation and heat dissipation of device and the wiring simulation. On the basis of computational fluid dynamics (CFD) and heat transfer fundamentals, and combing with power electronics to research key technologies of modeling thermal analysis, which includes mathematical models for heat losses and three-dimensional model for thermal analysis of power devices. On the one hand, the ventilation and heat dissipation of device is measured by solving temperature distribution, which can verify the rationality of the layout design from one hand. On the other hand, the rationality also can be verified by establishing a three-dimensional virtual wiring diagram of device to simulate wiring with digital technology.This paper combines with project on high frequency auxiliary power supplied for a Metro vehicle, uses SolidWorks Flow Simulation software as tool of thermal analysis. According to structure characteristics of high frequency auxiliary power, the component modules are simplified reasonably, and the parameters of thermal analysis are obtained and the corresponding model is established, then the temperature distribution is solved, in addition, the results are compared with the convention for evaluating the effect of ventilation and heat dissipation. Finally it is proved that the design of components’layout meets the requirements on ventilation and heat dissipation. Simultaneously, the three-dimensional virtual wiring diagrams of equipment master circuit are created with SolidWorks Routing software as support platforms.This thesis establishes a conduction convection model of a long pole and uses conduction differential equation and thermal analysis software to solve the problem of temperature distribution, which verifies the validity of thermal analysis with SolidWorks Flow Simulation. Meanwhile, the design of components’layout of the power supply equipment has been improved by using virtual wiring. According to the practice, it shows that the evaluation method worked out in this thesis is valid and practical.