Approach to the Practical Use of Thermoelectric Power Generation

The results of research and development in the Japanese national project “Development for Advanced Thermoelectric Conversion Systems” are summarized, and the approaches to practical use of advanced thermoelectric modules and power generation systems are presented. The 5-year national project was successfully completed in March 2007. Three kinds of high-efficiency cascaded thermoelectric modules and two kinds of innovative Bi-Te thermoelectric modules were successfully developed. Heat cycle tests for three types of modules were also completed. Moreover, four types of advanced thermoelectric power generation systems were experimentally demonstrated for recovery of waste heat from the industrial and private sectors. In order to proceed further, thermoelectric power generation systems using practical heat sources were followed after installation of the developed modules. In parallel, various approaches for practical use by private companies, as well as plans for the next-phase project by the National Institute of Advanced Industrial Science and Technology (AIST) and the Engineering Advancement Association (ENAA), were also followed. The scenarios to proceed to the commercial phase of thermoelectric power generation are discussed on the basis of the results of the national project.     

Experimental Characterization of Thermoelectric Modules and Comparison with Theoretical Models for Power Generation

The interest in thermoelectrics for power generation applications has dramatically increased over the past decade as a result of recent advancements in thermoelectric materials. Although measuring thermoelectric properties of materials has received significant attention, measuring thermoelectric module (TEM) power generation performance has received less attention. Characterizing TEMs is vital for validating module-level models used in optimizing TEM designs. Measurements of module performance can also be used for the optimal incorporation of TEMs into power generation systems. A TEM test apparatus has been developed and characterized to test current and future modules under a wide range of temperature and loading conditions. In addition to temperatures and electrical performance metrics, heat rates, and mechanical loading conditions are monitored. The developed technique extracts module parameters, which can be used for system-level design, to measure performance of advanced TEMs, and to validate theoretical models for module design optimization. Experimental results are compared with standard analytical TEM models and a newly developed model.     

高性能功率铁氧体材料的配方与烧结工艺

根据高频开关电源变压器对高性能功率铁氧体材料的要求,分析研究了主配方、微量添加物和烧结工艺对铁氧体材料的高起始磁导率(μi)、饱和磁通密度(Bs)、低功率损耗(Pc)等特性的影响,得出:通过采取优选主结构原材料配比、掺入适量的CaO、SiO2、TiO2、Co2O3等添加物,并与烧结工艺相匹配等措施,即可制得PC44、PC50等高性能功率铁氧体材料。     

大功率LED散热技术和热界面材料研究进展

LED结温的升高将造成发光强度降低、发光主波长偏移、寿命降低等不利影响,开发高效、紧凑、低成本、高可靠性的散热技术是LED的重点研究内容之一。总结了目前大功率LED不同类型散热技术的原理及其研究现状,包括自然对流、风冷、液冷、热管和热电制冷等,分析了各种散热技术的优缺点。并介绍了目前LED常用的几种热界面材料,指出碳纳米管是一种非常有潜力的热界面材料。     

有源电子式电流互感器高压侧电源的研究

电流互感器是电力系统中的重要设备,介绍一种适用于有源电子式电流互感器的悬浮式直流电源的设计原理。提出一种用补偿线圈和充电电池相结合的方法对母线电流取能方式进行改进的新方案,使电源在更宽的一次侧电流动态范围内满足电子式电流互感器对电源的要求。实验结果表明,该电源能够满足高压侧电子电路的供能要求。该方法是目前解决有源电子电流互感器高压侧电源问题的有效方法之一。     

高精度0～3.5 A大功率激光器测试系统设计

针对大功率激光器设计一种高稳定、0～3．5A连续可调的恒流驱动测试系统。它具有0.5％以下的失真度，稳定可靠；整个系统采用计算机控制，便于操作、调节和使用。同时还有一套有效的电源保护措施，使系统安全可靠，能成为一种适用于大功率激光器的较为理想的测试系统。     

同步送粉大功率激光表面宽带熔覆技术

报道通过积分镜将激光光束聚焦成宽光带、配合同轴保护矩形送粉喷头实现大功率激光宽带熔覆的装置及其工艺试验结果,激光功率为14kw时,单道熔覆层宽度达45mm,厚度达3mm,熔覆层表面平整,厚度均匀.     

Correlation of Electrical Noise with Non—radiative Current for High Power QWLs

The characteristics of low-frequency electrical noise, voltage-current (V-I) and electrical derivation for 980 nm InGaAsP/InGaAs/GaAs high power double quantum well lasers (DQWLs) are measured under different conditions.The correlation of the low-frequency electrical noise with surface non-radiative current of devices is discussed.The results indicate the low-frequency electrical noise of 980 nm DQWLs with high power is mainly 1/? noise and has good relation with the device surface current at low injection.     

高功率因数、低谐波、高转换效率单晶炉电源

介绍了几种常用的单晶炉整流电源的结构方式,重点介绍了不同整流电源的特点,通过实际应用及测试分析了各种电源的能耗及功率因数、谐波、转换效率;最终提出了高效节能的新型整流电源。     

用双闸流管运行的高功率铜蒸气激光器电源的研究

介绍了采用双闸流管作主放电开关的高功率铜蒸气激光器电源的原理、实验和结果。输入电源的功率达到10kW,输出激光平均功率最高达到100W,国产闸流管可以有效、正常地工作。     

带电平位移电路的H桥高端功率管栅极驱动电路

提出了一种带高压电平位移电路的H桥高端功率管栅极驱动电路.电平位移电路采用脉冲下拉方式实现高压电平位移,与一般的方波下拉方式相比,有效地减小了电路的功耗.分析了脉冲下拉方式电平位移电路的工作原理与实现方式,以此为基础,设计了H桥高端驱动电路.基于5μm高压BCD工艺,采用Spectres进行电路仿真,完成了电路版图设计和流片测试.结果显示,设计的高端驱动电路能很好地实现高端功率管栅极电位的悬浮抬升.     

用于米波雷达发射机的高功率同轴谐振方腔

介绍了在米波雷达发射机中使用电子管FU-113F作为放大管、采用共栅电路的同轴谐振方腔的设计,重点介绍了构成同轴谐振方腔的输入匹配电路、输出匹配电路和中和电路,叙述了谐振方腔和电子管采用的风冷方法,最后给出了电子管工作时的测试结果.     

神光Ⅲ强激光能源模块高储能密度电容器的快速保护

分析了大功率激光脉冲电源高储能密度电容器快速保护的必要性 ,提出了电感和特种熔断器快速保护技术路线 ,介绍了快速保护熔断器设计方法。试验表明 ,所研制的熔断器故障情况下可在四分之一周期时间内快速动作 ,使电容器反向电压不超过 10 %,已成功应用于神光Ⅲ能源模块高储能密度电容器的保护。     

一种新型大驱动、低功耗和高精度的电荷泵电路

提出一种适用于NOR结构快闪存储器应用的,具有大驱动能力、低功耗和高精度特性的电荷泵系统。它通过对八个子电荷泵的并联来提高电荷泵的驱动能力,并采用电容分离法来动态地自洽改变每个子电荷泵的驱动能力,仿真结果表明,在擦除模式、一位编程模式和八位编程模式工作下,其瞬态平均电流分别约为2.5mA、4 mA和12 mA,电荷泵的输出高压精度可达±2.3%以下,达到了节省功耗和提高输出高压精度的目的。     

A Ka‐Band 6‐W High Power MMIC Amplifier with High Linearity for VSAT Applications

A Ka‐band 6‐W high power microwave monolithic integrated circuit amplifier for use in a very small aperture terminal system requiring high linearity is designed and fabricated using commercial 0.15‐μm GaAs pHEMT technology. This three‐stage amplifier, with a chip size of 22.1 mm² can achieve a saturated output power of 6 W with a 21% power‐added efficiency and 15‐dB small signal gain over a frequency range of 28.5 GHz to 30.5 GHz. To obtain high linearity, the amplifier employs a class‐A bias and demonstrates an output third‐order intercept point of greater than 43.5 dBm over the above‐mentioned frequency range.     

工业用便携式低功耗高精度数字温度计设计

介绍了一种通过热电偶、A/D转换电路和单片机相结合设计低成本宽量程的低功耗高精度数字式温度计的方法 ,给出了硬件设计原理图和部分程序     

新型介质阻挡放电平面光源高压窄脉冲逆变电源的设计与研究

为了提高介质阻挡放电型平面光源的放电效率,本文设计并给出了一种可用于介质阻挡型平面光源及基于介质阻挡原理的气体放电器件的高压窄脉冲产生电路.该逆变电路包含两个全桥逆变电路部分,通过控制两全桥逆变电路输出脉冲的相位差来实现高压窄脉冲的输出.设计并验证了基于12英寸介质阻挡放电平面光源的电路原型.实验结果表明,该逆变电路可以实现最小脉宽为800 ns,脉冲幅值为4.5 kV的高压窄脉冲;亮度及发光效率随工作频率的升高而升高;当输入功率为36.4W时,亮度可达3200 cd/m2,此时系统发光效率为13.4 lm/W.     

1.08μm波长低阈值高效率强度差压缩光产生的实验研究

用倍频稳频ＮｄＹＡＰ激光器作泵浦源，经ＫＴＰ晶体构成的半整块ＯＰＯ腔，在９０°非临界相位匹配情况下获得高量子相关孪生光束，实测强度差噪声压缩度在１．５ＭＨｚ附近达８０％（７ｄＢ），阈值泵浦功率为８０ｍＷ。