發(fā)布時間：2019-05-06 14:16

【摘要】：隨著電子行業(yè)的發(fā)展,電力半導體器件向著小型化、緊湊化、高性能的方向發(fā)展,使得單個器件熱流密度和表面溫度越來越高,所以,研究功率半導體器件的散熱有重要意義。單純依靠理論計算的方法難以獲得半導體器件較為精確的性能指標,需要通過實驗來研究其散熱性能。本文根據(jù)電力半導體器件相關國家標準及工程實際要求,設計出了一套自動化程度高、測量準確、操作簡便的電力半導體器件風冷散熱系統(tǒng)實驗裝置,其包括風道設計、風機選型及空氣加熱器設計、測量系統(tǒng)設計和自動控制系統(tǒng)設計。本文根據(jù)所需測量半導體散熱器的特性,設計計算出測試風道,包括前穩(wěn)定段、測試段、后穩(wěn)定段,其中測試段可以旋轉一定角度。合理選型并布置各類傳感器、空氣加熱器、風機以及配套的變頻器和調功調壓器,使達到測試要求。設計自動控制系統(tǒng)對實驗平臺進行控制,并設置“自動”和“手動”兩種操作模式,實現(xiàn)自動控制試驗段進口風溫,風道內風速,并自動調節(jié)參數(shù)。為此選擇西門子S7-200系列PLC作為本測試平臺的下位機,應用STEP 7Micro/WIN編程軟件創(chuàng)建相應項目,以工控機為上位機,通過編程電纜與下位機連接。工控機裝有組態(tài)王軟件,能夠在軟件中控制測試平臺的啟停,應用PID調節(jié),可以對風機頻率和加熱器功率進行控制和調節(jié),軟件能夠實時顯示、存儲各種參數(shù)曲線及數(shù)據(jù),具有對歷史數(shù)據(jù)進行查詢、分析等智能功能,同時軟件還有擴展功能,以適應以后更高的設計要求。最后,對測試平臺的實驗裝置進行調試,通過對調試過程出現(xiàn)的PLC干擾問題的進行分析,給出解決方案。以熱管散熱器為例,依據(jù)傳熱學基礎理論,建立傳熱性能的理論模型,分析計算熱管和肋片的傳熱熱阻,為散熱器的實驗研究奠定理論基礎。應用測試平臺分別對典型的型材散熱器和熱管散熱器的熱阻流阻進行測試,與相關文獻結論相近,由此驗證本設計的準確性及合理性。
[Abstract]:With the development of electronic industry, power semiconductor devices are developing towards miniaturization, compactness and high performance, which makes the heat flux density and surface temperature of single device more and more high. Therefore, it is of great significance to study the heat dissipation of power semiconductor devices. It is difficult to obtain the more accurate performance index of semiconductor devices by the method of theoretical calculation, so it is necessary to study the heat dissipation performance of semiconductor devices by experiments. In this paper, according to the relevant national standards of power semiconductor devices and the practical requirements of engineering, a set of high automation, accurate measurement, simple operation of the power semiconductor device air-cooled cooling system experimental device is designed, which includes the design of air duct. Fan selection and air heater design, measurement system design and automatic control system design. According to the characteristics of the semiconductor radiator needed to be measured, the test duct is designed and calculated, including the front stability section, the test section and the post stability section, in which the test section can be rotated at a certain angle. Reasonable selection and arrangement of all kinds of sensors, air heaters, fan, frequency converter and power regulator to meet the test requirements. The automatic control system is designed to control the experimental platform, and two operating modes of "automatic" and "manual" are set up to automatically control the inlet air temperature and the wind speed in the air duct of the test section, and adjust the parameters automatically. For this reason, the Siemens S7x200 series PLC is chosen as the lower computer of the test platform, and the corresponding project is established by using STEP 7Micro/WIN programming software. The industrial computer is used as the upper computer and connected with the lower computer through the programming cable. The industrial control computer is equipped with configuration King software, which can control the start and stop of the test platform in the software. Applying PID regulation, the frequency of fan and heater power can be controlled and adjusted. The software can display and store all kinds of parameter curves and data in real time. It has intelligent functions such as querying and analyzing historical data. At the same time, the software also has extended functions to meet the higher design requirements in the future. Finally, the experimental equipment of the test platform is debugged. Through the analysis of the PLC interference in the debugging process, the solution is given. Taking the heat pipe radiator as an example, according to the basic theory of heat transfer, the theoretical model of the heat transfer performance is established, and the heat transfer resistance of the heat pipe and fin is analyzed and calculated, which lays a theoretical foundation for the experimental research of the radiator. The thermal resistance of the typical profile radiator and heat pipe radiator is tested by using the test platform, which is similar to the conclusion of the related literatures, thus validating the accuracy and rationality of the design.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN303

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本文編號：2470238