| Power electronics are widely used in all aspects of production and life,effectively cooling is needed during its working.The traditional cooling method is air cooling.The air cooling method has the disadvantages of small heat transfer density,large device volume,vibration and noise,and cooling effect controlled by the ambient temperature.As a new type of high heat flux density cooling device,liquid-cooled backplane overcomes many shortcomings of air-cooled cooling devices and has been applied in recent years to cooling occasions of high-power power electronic devices.Domestic and foreign research on the performance of liquid-cooled backplane less involved,especially in high-power power electronic equipment applications under the cooling performance of the test has not been involved.Therefore,research and design of liquid-cooled backplane performance test bench based on high-power power electronic devices is of great practical significance for the design and optimization of liquid-cooled backplane.The purpose of this thesis is to design a set of liquid-cooled backplane performance test device,which can test different working conditions at the same time in different working stations and meet the requirements of user's testing accuracy,stability,repeatability and automation.Based on this,the paper has done the following main research and work:(1)The working principle and development status of the liquid-cooled backplane are described.The research object of this topic is introduced from the perspective of the feasibility of liquid-cooled backplane in the application of high heat density scenarios.The significance of this topic is clarified.System structure and control algorithm in two aspects of the main research content of this article is established.(2)According to the relevant standards of heat exchanger performance test,combined with the working principle of the liquid-cooled backplane,the main test parameters and analysis indicators of the high-power liquid-cooled backplane performance testing system are determined,which include 112 measuring test parameters,and 38 control parameters on 12 workplaces.Accordingly,the system structure of the test bench is designed,including the host computer,the measuring and controlling instrument,the liquid-cooled unit and the cold liquid pipe network.Different control strategies are designed for different control objects,and equipment selection and integration are carried out.(3)Based on the technologies of virtual instruments,instrumentation and communication,database and so on,the host computer measurement and control software is designed on the Lab VIEW platform.The software is divided into five modules: data acquisition,system control,experiment interaction,data processing and user management.The functions of data acquisition and control,experimental condition setting,system stability,data display and query,report output,user login and registration are realized in 12 measurement stations.(4)The algorithm structure and model of PID controller are described in detail,and the thermostatic water tank is used as the measurement and control point.The Z-N parameter setting PID algorithm and fuzzy PID self-tuning algorithm are simulated by MATLAB / Simulink.Simulation results show that compared with the tuning method of Z-N parameters,the overshoot of fuzzy PID is smaller,and the adjustment time and the rising time are shorter.The thesis uses Lab VIEW to realize fuzzy PID self-tuning algorithm.(5)Discusses the system installation and debugging related content,including preparation before debugging,communication module debugging,software joint debugging three parts,focusing on the software functions were tested.The result shows that the performance test system of liquid-cooled backplane designed in this paper has complete functions,friendly interface and meets the needs of users. |
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