【作者】 高伟；

【导师】 杨杰；

【作者基本信息】 东北大学 ， 微电子学与固体电子学， 2019， 硕士

【摘要】 电源是指为电子设备提供能量的装置,一切电子设备的正常工作都离不开电源。而开关电源由于其体积小、功率密度大、稳定性好等优点,已经成为了应用最为广泛的电源设备之一。随着人类社会的不断发展,表层油气资源逐渐枯竭,深层油气资源将成为为今后重要的能源接替领域。井深的不断增加,使得井下温度越来越高,对开关电源的温度适应性也提出了更高的要求。而且随着半导体技术的发展,能够在宽温度范围内稳定工作的SiC功率器件的普及为高温开关电源的设计提供了更多可能性。本文基于一个井下开关电源项目,设计了能够在0～150℃的环境下稳定工作的宽输入双路输出开关电源模块。文中介绍了高温开关电源设计的整个过程:首先,根据项目的设计指标选择了最合适的反激拓扑并设计了能够满足温度要求的功率电路;然后找到了高温下的控制方案,进行了控制电路和驱动电路的设计并通过利用辅助绕组供电以及设计高温电容分压式启动电路解决了控制部分的供电问题;最后,为了保证输出电压的稳定,设计了高温下的隔离反馈电路,主要包括原边反馈的电路的设计以及系统补偿网络的设计,并在此基础上完成了高温变压器设计。本文在设计的基础上,进行了多个版本的PCB绘制和焊接,并完成了整个电源模块的调试,然后将电源模块的各项指标分别在常温(30℃)和高温(150℃)环境下进行了测试,最后使其通过了 150℃下48小时满载不间断工作测试。通过对测试结果的分析,验证了电源模块的性能能够满足项目需求,并且能够在高温下长时间稳定工作。更多还原

【Abstract】 Power supply refers to the device that supplies energy to electronic devices.All electronic devices cannot work without power.Switching power supply has become one of the most widely used power supply equipment due to its small size,high power density and good stability.With the continuous development of human society,surface oil and gas resources are gradually depleted,and deep oil and gas resources will become an important energy replacement field in the future.The increasing depth of the well makes the underground temperature higher and higher,this puts higher requirements on the temperature adaptability of the switching power supply.Moreover,with the development of semiconductor technology,the popularity of SiC power devices capable of stable operation over a wide temperature range provides more possibilities for the design of high temperature switching power supply.Based on a downhole switching power supply project,this paper designed a wide input dual output switching power supply module that can work stably in the environment of 0～150℃.The whole process of high-temperature switching power supply design was introduced in this paper.Firstly,according to the design index of the project,the most suitable flyback topology was selected and the power circuit that can meet the temperature requirement was designed.Then the control scheme at high temperature was found.The control circuit and drive circuit were designed,and the power supply problem of control part was solved by using auxiliary winding power supply and designing high-temperature start-up circuit using capacitor divider.Finally,in order to ensure the stability of the output voltage,an isolated feedback circuit at high temperature was designed,mainly including the design of the circuit for primary feedback and the design of the system compensation network.And on this basis,completed the design of the high temperature transformer.Based on the design,the PCB was drawn and soldered,and the whole power module was debugged.Then the indicators of the power module were tested at room temperature(30℃)and high temperature(150 ℃).Finally,it passed the 48-hour full load uninterrupted work test at 150℃.Through the analysis of the test results,it is verified that the performance of the power module can meet the project requirements and can work stably for a long time at high temperatures.更多还原