研究了高压LTCF变压器的测试原理与方法,并进行了相应的硬件电路设计与试验验证。该方法基于反激式变换电路,从理想变压器电路出发,推导了高压LTCF变压器输出电压公式,分析了各参量的影响。针对LTCF变压器的大漏感所造成的电压尖峰突出...研究了高压LTCF变压器的测试原理与方法,并进行了相应的硬件电路设计与试验验证。该方法基于反激式变换电路,从理想变压器电路出发,推导了高压LTCF变压器输出电压公式,分析了各参量的影响。针对LTCF变压器的大漏感所造成的电压尖峰突出问题,采取增大寄生电容的方式予以抑制。最后,对电科九所生产的高压LTCF变压器进行实际测试,设计了开环电路测试变压器最大输出能力,闭环电路实现了1.2 k V稳定电压输出。展开更多
采用双层硅胶加盖不锈钢材质层压板的层压方法制备功率型低温共烧铁氧体(LTCF)变压器。通过断面显微结构、电感值及耐压的测试,研究了层压方法对其结构及性能的影响。结果表明,相对于传统的层压方法,新方法制作的变压器层压受力均匀、...采用双层硅胶加盖不锈钢材质层压板的层压方法制备功率型低温共烧铁氧体(LTCF)变压器。通过断面显微结构、电感值及耐压的测试,研究了层压方法对其结构及性能的影响。结果表明,相对于传统的层压方法,新方法制作的变压器层压受力均匀、表面不平整度≤±5μm/10 mm,无凸起、分层,排胶烧结过程中未出现开裂、翘曲等缺陷,显微结构理想。变压器性能为,初级电感:≥60μH、次级电感:≥2.6 m H、漏感:≤35μH、耐压:≥1500V(DC),且满足高低温应用环境(-55^+85℃)下磁性能使用可靠性和环境适应性要求。展开更多
毫米波环行器作为雷达、通讯等微波系统中的必备元件之一,起着信号定向传输、收发双工的作用。随着雷达、通信和电子对抗一体化等平台的发射接收系统对"阵列化、高度集成、无源化"等应用需求,对环行器提出了小型化、表贴要求...毫米波环行器作为雷达、通讯等微波系统中的必备元件之一,起着信号定向传输、收发双工的作用。随着雷达、通信和电子对抗一体化等平台的发射接收系统对"阵列化、高度集成、无源化"等应用需求,对环行器提出了小型化、表贴要求。本文介绍了一种基于低温共烧铁氧体工艺(LTCF,Low Temperature Co-fire Ferrites)制作的新型通讯用表贴环行器,该类产品的特点是体积小、重量轻,便于集成。展开更多
Layered tin chalcogenide frameworks (LTCFs) have attracted great attention due to the stable structure and effective integration of porosity with semiconducting properties.Though they have a much suitable band gap and...Layered tin chalcogenide frameworks (LTCFs) have attracted great attention due to the stable structure and effective integration of porosity with semiconducting properties.Though they have a much suitable band gap and rich structures,the significance of LTCFs in photoelectrochemical applications and “structure-property” studies is highly undervalued.Herein,we report an example of “structure-property” correlations in photoelectrochemical applications using three subtly regulated LTCFs that show nuances in the intralayer architecture and packing mode of layers.Of particular interest is the huge difference in their photoelectric responses despite the same secondary building block (Sn_(3)S_(4)),linkers (shared Sn_(2)S_(2)) and 2D honeycomb-type topology.In particular,LTCF-3 has the highest photocurrent density,which is nearly five times that of LTCF-2.Enhanced photoelectric response for LTCF-3 was attributed to the elongated distance between adjacent clusters,which dramatically decreased the recombination of photo-induced carriers.This deduction was supported by precise structure analysis,UV-vis absorption spectroscopy and theoretical calculations.展开更多
文摘研究了高压LTCF变压器的测试原理与方法,并进行了相应的硬件电路设计与试验验证。该方法基于反激式变换电路,从理想变压器电路出发,推导了高压LTCF变压器输出电压公式,分析了各参量的影响。针对LTCF变压器的大漏感所造成的电压尖峰突出问题,采取增大寄生电容的方式予以抑制。最后,对电科九所生产的高压LTCF变压器进行实际测试,设计了开环电路测试变压器最大输出能力,闭环电路实现了1.2 k V稳定电压输出。
文摘采用双层硅胶加盖不锈钢材质层压板的层压方法制备功率型低温共烧铁氧体(LTCF)变压器。通过断面显微结构、电感值及耐压的测试,研究了层压方法对其结构及性能的影响。结果表明,相对于传统的层压方法,新方法制作的变压器层压受力均匀、表面不平整度≤±5μm/10 mm,无凸起、分层,排胶烧结过程中未出现开裂、翘曲等缺陷,显微结构理想。变压器性能为,初级电感:≥60μH、次级电感:≥2.6 m H、漏感:≤35μH、耐压:≥1500V(DC),且满足高低温应用环境(-55^+85℃)下磁性能使用可靠性和环境适应性要求。
文摘毫米波环行器作为雷达、通讯等微波系统中的必备元件之一,起着信号定向传输、收发双工的作用。随着雷达、通信和电子对抗一体化等平台的发射接收系统对"阵列化、高度集成、无源化"等应用需求,对环行器提出了小型化、表贴要求。本文介绍了一种基于低温共烧铁氧体工艺(LTCF,Low Temperature Co-fire Ferrites)制作的新型通讯用表贴环行器,该类产品的特点是体积小、重量轻,便于集成。
基金financial support from National Natural Science Foundation of China(22201117)Shandong Province Natural Science Foundation(ZR2022QB003)+1 种基金Doctoral Program of Liaocheng University(No.318052049)Jiangsu Specially Appointed Professorship and the startup funding from Nanjing Normal University,and the Development Project of Youth Innovation Team in Shandong Colleges and Universities(2019KJC031).
文摘Layered tin chalcogenide frameworks (LTCFs) have attracted great attention due to the stable structure and effective integration of porosity with semiconducting properties.Though they have a much suitable band gap and rich structures,the significance of LTCFs in photoelectrochemical applications and “structure-property” studies is highly undervalued.Herein,we report an example of “structure-property” correlations in photoelectrochemical applications using three subtly regulated LTCFs that show nuances in the intralayer architecture and packing mode of layers.Of particular interest is the huge difference in their photoelectric responses despite the same secondary building block (Sn_(3)S_(4)),linkers (shared Sn_(2)S_(2)) and 2D honeycomb-type topology.In particular,LTCF-3 has the highest photocurrent density,which is nearly five times that of LTCF-2.Enhanced photoelectric response for LTCF-3 was attributed to the elongated distance between adjacent clusters,which dramatically decreased the recombination of photo-induced carriers.This deduction was supported by precise structure analysis,UV-vis absorption spectroscopy and theoretical calculations.
