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2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)最新文献

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13.56 MHz class E power amplifier with 94.6% efficiency and 31 watts output power for RF heating applications 13.56 MHz E类功率放大器,效率94.6%,输出功率31瓦,适用于射频加热应用
Pattrawut Srimuang, N. Puangngernmak, S. Chalermwisutkul
Radio frequency power amplifiers (RF PA) are widely used for several applications e.g. wireless communication, wireless power transmission (WPT) and radio frequency heating. In general, the choice of power amplifier's operating class is based on requirements regarding linearity and power efficiency. For applications in which linearity is not a critical issue whereas high efficiency is desired, switched-mode amplifier e.g. class E is suitable. Switched-mode operation of class E offers high efficiency with a simple topology, leading to optimal costs of production and system operation. This work presents design and implementation of a high power and high efficiency 13.56 MHz class E power amplifier with parallel load circuit. As a power device, LDMOS was chosen. The fabricated class E PA provides Power-Added Efficiency (PAE) of 94.6% with 21.92 power gain when maximum output power of 44.92 dBm (31 W) is delivered to the load. Industrial, Scientific and medical (ISM) bands Class E PA with parallel load circuit.
射频功率放大器(RF PA)广泛应用于无线通信、无线电力传输(WPT)和射频加热等领域。一般来说,功率放大器工作等级的选择是基于对线性度和功率效率的要求。对于线性度不是关键问题而需要高效率的应用,可以使用E类开关模式放大器。E类的切换模式操作以简单的拓扑结构提供了高效率,从而实现了生产和系统运行的最佳成本。本文设计并实现了一种带并联负载电路的高功率、高效率13.56 MHz E类功率放大器。功率器件选择了LDMOS。当最大输出功率为44.92 dBm (31 W)时,制造的E级PA可提供94.6%的功率附加效率(PAE)和21.92的功率增益。工业,科学和医疗(ISM)带epa级并联负载电路。
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引用次数: 24
A flat monopole over rectangle box ground plane 矩形箱形地平面上的扁平单极子
D. Srimoon
This paper presents a flat monopole over rectangle box ground plane. The monopole element is contributed from copper that coated on surface of the FR4 and rectangle box ground plane is contributed from brass sheets. The antenna provides the frequency range of 1.4-3.4 GHz with the return loss <;-15 dB and average gain of 5.5 dBi. The HPBW is 108 degrees in the horizontal plane and 88 degrees in the vertical plane at the central band. The front-to-back ratios are greater than 8 dB across operating band with the ground plane of 80 mm × 50 mm and height of 35 mm. The antenna is suitable to use as a base station antenna.
本文提出了矩形箱形地平面上的平面单极子。单极元件由镀在FR4表面的铜提供,矩形盒接平面由黄铜片提供。天线的工作频率范围为1.4-3.4 GHz,回波损耗< - 15db,平均增益5.5 dBi。在中心波段,HPBW在水平面上为108度,在垂直平面上为88度。工作频带前后比大于8db,接平面为80mm × 50mm,高度为35mm。该天线适合作为基站天线使用。
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引用次数: 0
The bandwidth enhancement of rectangular slot antenna with H and T-shaped slot tuning for ultrawideband applications 超宽带应用中H型和t型槽调谐矩形槽天线的带宽增强
W. Naktong, Supatinee Kronsing, A. Ruengwaree
This article presents the enhancement of bandwidth for rectangular slot antenna with an H and T-shaped slot tuning. The bandwidth was increased from the original antenna by using the T-shaped slot tuning technique and adding the tuning stubs on the both sides of ground plane. The proposed antenna can be applied to ultra-wideband frequency range between 3.1-10.6 GHz based on the IEEE 802.15.3a standard with compact antenna dimension of 30×35 mm2. In designing the antenna, the simulation software, CST Microwave Studio, was used to study and analyze various parameters and characteristics. The simulation and measurement results were agreed fairly well and they showed that the impedance bandwidth was about 130.49% (2.82-13.41 GHz) which was increased from the original antenna by 53.35%, with the average gain of 4.76 dBi possessing bi-directional radiation pattern.
本文介绍了用H型和t型缝隙调谐提高矩形缝隙天线带宽的方法。采用t型槽调谐技术,在接地面两侧增加调谐桩,在原有天线的基础上增加带宽。该天线可应用于基于IEEE 802.15.3a标准的3.1-10.6 GHz的超宽带频率范围内,天线尺寸紧凑,为30×35 mm2。在天线设计中,利用CST Microwave Studio仿真软件对天线的各项参数和特性进行了研究和分析。仿真与测量结果吻合较好,阻抗带宽约为130.49% (2.82 ~ 13.41 GHz),比原天线增加53.35%,平均增益为4.76 dBi,具有双向辐射方向图。
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引用次数: 6
Effect due to down-tapering on the hybrid mode power confinement in liquid crystal optical fiber 下锥效应对液晶光纤混合模功率约束的影响
M. Ghasemi, Pankaj Kumar Choudhury
The paper presents analysis of the wave propagation through down-tapered three-layer liquid crystal optical fiber in respect of power confinement due to the hybrid modes supported by the guide. The inner two regions are homogeneous and isotropic dielectrics whereas the outermost layer being composed of radially anisotropic liquid crystal material. It has been found that the guide supports relatively very high amount of power in the liquid crystal region, which indicates the possible use of such microstructures in varieties of optical applications. The effects on confinement due to the positive and the negative (illustrating the taper type) values of taper slopes are reported.
本文分析了下锥型三层液晶光纤中由于波导支撑的混合模式所造成的功率限制问题。内两层为均匀各向同性介质,而最外层为径向各向异性液晶材料。研究发现,该波导在液晶区支持相对非常高的功率,这表明这种微结构在各种光学应用中的可能用途。报道了正、负(说明锥度类型)锥度斜率值对约束的影响。
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引用次数: 0
The Design of a Wristband Screen application for interface with Android systems 与Android系统接口的腕带屏幕应用程序的设计
Wuttinan Sereethavekul, M. Ekpanyapong
Smartphone has overcome human life very quickly at this moment since Android was introduced to the world in April 2009. Because of being a smartphone, people can make use of it in vary ways. It can be used as a cellphone, a media player, an internet browser or even a gaming console. It makes people life easier by having it. The Design of Wristband Screen for Android is especially made for getting more accessibility in using Android devices, for instance, view or control a device from a distance. Wristband Screen for Android helps users to keep in touch with their Android devices all the time while those Android devices may be lying down inside a pocket or a backpack. The Wristband Screen for Android itself displays the exact screen of an Android device and users can control their devices from this screen as well. Wristband Screen for Android System is a wearable device prototype.
自从2009年4月安卓系统问世以来,智能手机已经很快地征服了人类的生活。因为它是智能手机,人们可以用不同的方式使用它。它可以被用作手机、媒体播放器、网络浏览器,甚至是游戏机。它让人们的生活更轻松。Android的腕带屏幕设计是专门为Android设备的使用提供更多的可访问性而设计的,例如,从远处查看或控制设备。Android的腕带屏幕可以帮助用户在安卓设备躺在口袋里或背包里的时候,始终与他们的安卓设备保持联系。Android的腕带屏幕本身显示了Android设备的确切屏幕,用户也可以从这个屏幕上控制他们的设备。Android系统的腕带屏幕是一个可穿戴设备的原型。
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引用次数: 1
Insulation level and clearances for 230 kV air insulated substation 230kv空气绝缘变电站的绝缘等级和绝缘间隙
T. Thanasaksiri
This paper analyzes the insulation level and air clearances of 230 kV air insulated substation. In order to get the BIL, the crest voltage at any equipment are required. By applying simplified calculation method taken from IEEE Std. 1313.2-1999 and IEEE Std. 1427-2006 compared with digital simulation. The simulations have been implemented using simplified models via EMTP-ATP. The BIL required and BIL selected from simplified calculation may give the insulation level not in the range, so the digital simulation would be the better choice. The effect of elevation from sea level as well as the switching surge have been considered for insulation levels and clearances.
分析了230kv空绝缘变电站的绝缘等级和空气间隙。为了得到BIL,任何设备的峰值电压都是必需的。采用IEEE标准1313.2-1999和IEEE标准1427-2006的简化计算方法,对数字仿真结果进行了比较。利用EMTP-ATP进行了简化模型的仿真。所需的BIL和简化计算中选择的BIL可能会给出不在范围内的绝缘等级,因此数字模拟是较好的选择。考虑了海拔高度和开关浪涌对绝缘水平和间隙的影响。
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引用次数: 3
Estimation of the autonomic nerve activity with facial thermogram 用面部热像图估计自主神经活动
S. Kawazura, N. Itakura, K. Mito, M. Uchida, Tota Mizuno, A. Nozawa, H. Asano
In this study, a technique designed to estimate of the autonomic nerve activity with a facial thermogram has been conducted a research and development. Workers feel more mental work-load (: MWL) by advanced information society. Preventing human errors and health hazards with MWL is important. Research activities about MWL, there is the method using thermogram. Thermogram can be taken by non-contact thermometer easily such as a thermography. It can take in the shop floor or life log. But the method needs to measures time-series data at all process of experiment. In addition, if a subject is out of focus of thrmography, it is difficult to estimate MWL. Therefore, measurement environment is limited. In this study, new method are proposed to estimate of the autonomic nerve activity with facial thermogram. If new method with facial thermogram can estimate MWL to high quality, it can use in various situation. Thermograms was taken when a subject solved the issue of a mental arithmetic calculation. And the proposed method has been analyzed by thermograms. As a result of this experiment, proposed method is more sensitive than past technique.
本研究对利用面部热像图估计自主神经活动的技术进行了研究和开发。随着信息社会的发展,劳动者的心理负担越来越重。用MWL防止人为错误和健康危害是很重要的。关于MWL的研究活动,有热成像的方法。热像图可以用非接触式温度计轻松地拍摄,如热像仪。它可以记录车间或生活日志。但该方法在实验的各个过程中都需要测量时间序列数据。此外,如果受试者不在血压计的焦点上,则很难估计MWL。因此,测量环境是有限的。本研究提出了利用面部热像图估计自主神经活动的新方法。如果基于面部热像图的新方法能够高质量地估计出MWL,则可以在各种情况下使用。当受试者解决了心算问题时,就会拍下热像图。并用热图对该方法进行了分析。实验结果表明,该方法比以往的方法灵敏度更高。
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引用次数: 6
Discrimination of chicken freshness using electronic nose combined with PCA and ANN 结合PCA和ANN的电子鼻鸡肉新鲜度判别
Kriengkri Timsorn, C. Wongchoosuk, Pakaket Wattuya, Sansoen Promdaen, Suwimol Sittichat
We have developed a portable electronic nose (E-nose) based on eight metal oxide gas sensors for classification and prediction of meat freshness. In this study, the E-nose was applied to predict chicken freshness during different storage days. Principal component analysis (PCA) and artificial neural network (ANN) were used to analyze the experiment data. The PCA method can classify the chicken freshness related to storage days. The ANN result shows good agreement with the PCA result. The correct rate in classification of ANN is 97.92%. From PCA and ANN results, it indicates that the E-nose can well classify and predict the freshness of chicken and owns many advantages over other methods including easy operation, rapid detection, high accuracy, and safety for meat.
我们开发了一种基于八个金属氧化物气体传感器的便携式电子鼻(E-nose),用于肉类新鲜度的分类和预测。在本研究中,利用电子鼻预测不同贮藏天数的鸡肉新鲜度。采用主成分分析(PCA)和人工神经网络(ANN)对实验数据进行分析。主成分分析法可以对鸡肉新鲜度与储存天数的关系进行分类。人工神经网络的结果与主成分分析的结果吻合较好。人工神经网络的分类正确率为97.92%。从主成分分析和人工神经网络的结果来看,电子鼻能很好地对鸡肉的新鲜度进行分类和预测,与其他方法相比,具有操作简单、检测速度快、准确率高、对肉类安全等优点。
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引用次数: 13
Real-time obstacle avoidance for car robot using potential field and local incremental planning 基于势场和局部增量规划的汽车机器人实时避障
Sittichai Boonyarak, P. Prempraneerach
Integration of local incremental planning and potential field is proposed for a motion planning of the car-like robot in this research so that obstacle avoidance and goal seeking could be achieved in real time. The feedback linearization control using a desired trajectory generated from the virtual force of potential function could help accomplishing these objectives. Both attractive and repulsive forces are function of both relative position and velocity between robot-obstacle and robot-target. The motion planning of the car-like robot has been demonstrated using this new local incremental planning when the unknown and dynamics environment contains either fixed multiple obstacles or moving obstacles. Results, demonstrated in Matlab simulation, reveal that the car-like robot can reach the target point and avoid moving obstacles at the same time, which could be implemented for a real car robot in near future.
本研究提出了将局部增量规划与势场相结合的类车机器人运动规划方法,实现了机器人的实时避障和目标寻优。利用势函数虚力产生的期望轨迹的反馈线性化控制可以帮助实现这些目标。引力和斥力都是机器人-障碍物和机器人-目标之间的相对位置和相对速度的函数。在未知和动态环境中包含多个固定障碍物或移动障碍物时,利用这种新的局部增量规划方法对类车机器人进行了运动规划。Matlab仿真结果表明,该仿车机器人可以同时到达目标点并避开移动障碍物,在不久的将来可以在真正的汽车机器人上实现。
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引用次数: 2
A transient-free structure for Lagrange-type variable fractional-delay digital filter 拉格朗日型可变分数延迟数字滤波器的无瞬变结构
Parinya Soontornwong, S. Chivapreecha, C. Pradabpet
This paper presents a new structure for Lagrange-type variable fractional-delay (VFD) filter. A new structure is formulated from discrete Pascal transform (DPT) and its Pascal interpolation. The computational complexity which obtained from proposed structure is linear function of VFD filter order as same as the so-called Taylor's series structure and also be modular structure. Unfortunately, Taylor's series structure is suffered from transient error that caused from changing delay parameter but the proposed structure can online adjust delay parameter without transient error. Therefore, a transient-free structure will be the new choice for Lagrange-type VFD filters structure which is suitable for real-time application such as sampling rate conversion (SRC) and timing recovery in digital receiver.
提出了一种新的拉格朗日型可变分数延迟(VFD)滤波器结构。从离散帕斯卡变换(DPT)及其帕斯卡插值出发,提出了一种新的结构。该结构的计算复杂度与泰勒级数结构相同,是VFD滤波器阶数的线性函数,也是模结构。Taylor级数结构存在由于延迟参数变化而引起的暂态误差,但该结构可以在线调整延迟参数而不产生暂态误差。因此,无瞬变结构将成为拉格朗日型VFD滤波器结构的新选择,适合于数字接收机中采样率转换(SRC)和定时恢复等实时应用。
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引用次数: 1
期刊
2014 11th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON)
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