Lithium battery internal resistance detection based on transition process analysis

以常用的锂电池模型为研究对象,通过对电池放电过程瞬间电流阻断产生的过渡过程的分析,提出了一种锂电池模型参数估算方法,进而实现对锂电池内阻的在线实时辨识。通过实验,获得了电池内阻在不同工况下的变化趋势。Based on used lithium battery model, by the analysis of transition process produced by current blocking-up in the process of battery discharge, a lithium battery model parameter estimation method was put forward.Online real-time identification of lithium battery internal resistance was realized.Through experiments, the trend of the internal resistance of the battery in different operating conditions was obtained.厦门市科技计划项目(3502Z20123013

Study on properties of armature current for micro DC motors and multiple features of fault diagnosis

针对直流微电机生产线上故障检测环节难以自动化的问题,提出一种基于故障多特征量的直流微电机故障诊断模型。通过分析空载和稳态下直流微电机的动态数学模型,推导出电枢电流的时域解析式,确定基于电枢电流的频域故障多特征量。以数台直流微电机为实验样本,分析其电枢电流时频域特征,对典型故障直流微电机运用定义的故障多特征量进行故障分析。实验结果表明不同故障电机的多特征量变化率明显不同,该故障多特征量可以被用来诊断直流微电机。A fault diagnostic model for the micro direct-current motor( MDCM) was presented,which is used to solve the problem that MDCMs can't be automatically inspected on the production line.The method was based on multiple features of the armature current.The analytical expression for the armature current was obtained from the dynamic model of MDCM under no-load and steady-state operation conditions.The multiple features based on the armature current were confirmed.The experiments on several motors with the representative failures were studied.The time-frequency domain features of the current for the MDCM were analyzed.The fault mechanism were analyzed by using the multiple features mentioned above.The experimental results show that the relative changes of the multiple features in different fault cases are different and the multiple features can be utilized as the fault diagnostic indices.福建省科技厅重大项目(2014H6026); 贵州教育厅自然科学研究项目(黔教合KY字(2012)075号

A Technique of Automatic Current Sharing for Parallel Switching Power Supply

为了解决大功率开关电源模块并联运行时均流问题,给出了一种应用于并联开关电源的电流自平衡控制方案。介绍了电源并联系统拓扑结构,分析了并联系统模块间环流、功率调节等关键性问题,设计了采用电流自平衡并联技术构成的恒压电源及恒流电源试验。仿真与试验表明,电源模块输出电压、电流波动分别小于0.83%和0.53%,模组之间电流不平衡度小于3.78%,瞬态响应快、稳定性好。In order to solve the problem of the current sharing of parallel high power supplies,a digital current sharing control technique for parallel modularized switching power supply operation was investigated.The structure of the parallel system was presented,and a series of key problems,such as the circumfluence of paralleled system,characteristics of the power regulation were analyzed.The paper also designed some experiments based on automatic current sharing technique for constant voltage power supply and constant current power supply.Through the simulation and experiments,satisfactory dynamic and static performance of the power supply was obtained.The fluctuation of the voltage and current is less than 0.83% and 0.53% respectively,and the difference between the sub modules is less than 3.78%.What's more,the system has fast transient response and good stability

应用调整的膳食平衡指数评价厦门市区成年居民膳食质量

目的利用调整的中国膳食平衡指数(dbI-07)综合评价厦门市城区18~65岁居民膳食质量,为开展营养干预提供依据。方法采用多阶段分层整群抽样方法于2010年10—12月对厦门市区6个社区居委会成年居民进行调查,采用连续3天24 H回顾法对其中的520人进行了膳食调查,采用dbI-07的评分方法评价厦门城区成年居民膳食质量水平。结果被调查的厦门市城区成年居民的膳食质量处于中度失衡状态,摄入不足和摄入过量并存;女性的摄入不足程度高于男性;各年龄段中,40~50岁人群摄入不足程度最高,摄入过量程度最低。结论被调查的厦门市城区成年居民水果、奶类及豆类摄入不足,肉类、食用油及盐类摄入过量;成年居民的主要膳食模式为A模式,且A模式反映了膳食中摄入不足与摄入过量的问题均较少,为最优模式。中央财政转移支付地方项

A Double Time Constant Charge and Discharge Modeling and Simulation of Lithium Battery

根据动力锂离子电池充放电特性建立了一种采用快慢电容回路模拟充放电双时间常数动力锂电池的电池模型.详述了模型建立的理论推导过程,经仿真表明,该模型能够准确地反映动力锂电池充电及放电特性以及荷电状态(SOC)的动态变化.According to charging and discharging characteristics of lithium batteries,this paper develops a lithium battery model to simulate the charge and discharge process with fast and slow capacitance double-time constant circuit,and details the theoretical derivation procedure that has developed the model.The simulation result shows that the model can accurately reflect lithium battery charge and discharge characteristics and dynamic changes of the charge state.厦门市科技计划项目(3502Z20123013

Fiber Temperature Sensor for Contact Terminal of High-voltage Circuit Breaker

针对10kV断路器在线温度监测难的问题,提出一种基于反射式强度调制的光纤温度传感器系统,温度敏感元件为双金属片.利用双金属对温度敏感的变形特性,将温度变化量调制到接收光纤输出光通量上,通过对红外接收管输出电压的检测,实现对温度的测量.通过理论推导,证实了测量系统输出电压与温度变化具有线性关系.文中详述了传感器系统的结构,给出了实验装置,进行了30~120℃内的测试实验,实验结果与理论推导吻合,且显示出较优良的特性,其测量误差小于5%,重复性良好.最后给出了在断路器触头的测温安装方法和实验结果.In order to achieve on-line temperature monitoring for the 10 kV circuit breaker,this paper proposes a type of optical fiber temperature sensor systems,which are based on the changing of reflective intensity modulation.A bimetal strip is used as the temperature sensitive element.In this system,the luminous flux of the receiving optical fiber will be changed when the bimetal deforms following temperature changes.Through detecting the voltage of the infrared receiving tube,we could achieve temperature measurements.This measurement system has been demonstrated through theoretical derivation that the output voltage has a linear relationship with the temperature change.The experimental result is in conformity with the theoretical derivation.Moreover,it indicates that this system enjoys a measurement error lower than 5% and high repeatability.福建省科技计划项目(2014H6026

MG转轮收集探测系统的检验实验

利用SFC提供的束流对新建的转轮系统进行了检验实验,得到了相关的实验结果.实验证明了该装置的可靠性,为进一步开展超重核的研究完成了预实验