共查询到19条相似文献,搜索用时 78 毫秒
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近年来,新一代功率半导体器件进入电力电子领域后,交流变频调速逆变装置、开关电源等日渐普及,原有的电流检测元件已不适应中、高频、高di/dt电流波形的传递检测。霍尔电流传感器模块是近几年发展起来的测量、控制电流的新一代工业用传感器,是弥补这一空缺的高性能电流 相似文献
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《电子技术与软件工程》2019,(14)
本文分析了几种外磁场自抑制技术,设计了一种外磁场自抑制霍尔电流传感器。研制的传感器在80Gs磁场下,零点输出变化在0.6%FS以内,传感器抗磁场干扰能力大大提高。 相似文献
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为了解决现有闭环霍尔电流传感器需要双电源供电,无法直接应用在单电源系统的问题,设计了一种单电源供电电压输出型的高精度闭环霍尔电流传感器。理论说明了其设计方案,磁路上考虑了磁环材料、几何尺寸及开口宽度,并用有限元对其进行了仿真,电路上应用由双运放组成的桥式驱动电路驱动反馈线圈,采用电压检测芯片将反馈电流转化为电压输出,为验证方案可行性?制作了量程为±50A的实验样机。实验结果表明,该霍尔电流传感器灵敏度可达40mV/A,其线性度和精度分别为0.15%和0.25%,适用于单电源系统。 相似文献
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霍尔电流传感器在家用电器电气参数测试中的应用 总被引:2,自引:0,他引:2
首先介绍了霍尔器件及两种工作模式的霍尔电流传感器的基本工作原理,然后说明了已研制成功的两种智能化测试仪器——热态电气强度测试仪和接地电阻测试仪的结构组成与应用情况。 相似文献
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介绍闭环霍尔电流传感器的工作原理及其在地面车用电源系统中的应用,实现了对车用电源系统输出电流的隔离测量和控制,解决了地面车辆中大功率发电系统的限流保护问题. 相似文献
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基于霍尔电流传感器原理设计飞机点火电流测试系统,将该系统与互感器、分流器进行比较,发现霍尔传感器系统响应时间较短,且测试流程简单,精确度高。同时阐述了霍尔电流传感器的原理,提出短时间内大电流非侵入式测试。在具体的测试过程中可有效屏蔽外界电磁干扰,获得较为准确的火花电流数据图,且具有良好的重复性。 相似文献
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某构件为多层窄间隙结构的容器装置,为测试在具有一定压力的高速流场中流体诱发的内层板振动情况,基于电涡流原理设计了一种屏蔽式电涡流传感器,完成了屏蔽式电涡流传感器的探头线圈参数和探头壳体结构参数的优化设计、装配调试和第三方校准。试验结果表明:研制的屏蔽式电涡流传感器,在不干扰"流场",对装置结构不构成影响的前提下,实现了板间窄间隙振动的测试,传感器可靠有效。 相似文献
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Automatic calibration of Hall sensor microsystems 总被引:1,自引:0,他引:1
In many applications, a Hall element is used for contact-less measurement such as linear and angular positions, electrical current, power and energy, etc. The Hall element fabricated by means of CMOS technology features mediocre characteristics [R.S. Popovic, Z. Randjelovic, D. Manic, Integrated Hall-Effect Magnetic Sensors, EMSA, Germany, 2000; R.S. Popovic, Hall Effect Devices, Adam Hilger, Bristol, Philadelphia, New York, 1991]. It gives a weak output signal of the order of a few mV. This signal is often corrupted by sensor offset, noise, temperature and aging drift. This paper deals with the state of the art and main techniques capable to detect and compensate these issues. Case studies using mentioned techniques are also summarized. 相似文献
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传感光纤中的残余线性双折射、温度和振动敏感性严重影响着Sagnac 式全光纤电流传感器的精度。设计了一种可用于全光纤电流传感器的扭转高双折射光纤,该光纤由两端变速率扭转部分和中间匀速率扭转部分组成。其中,变速扭转部分能实现线偏振光和圆偏振光之间的相互转化,具有/4 波片功能;匀速扭转部分,具有较小的光纤固有线性双折射和圆保偏功能,从而可更为精确地感应法拉第效应。将这种扭转高双折射光纤绕制成特殊结构传感光纤环, 解决了Sagnac 效应以及电流导体位置对全光纤电流传感器测量结果的影响。理论上建立了扭转高双折射光纤的耦合模方程,模拟了线偏振光入射该光纤时光波偏振状态演化情况。在此基础上设计一种新型的抗振型Sagnac 式电流传感器。 相似文献
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In the future increasingly more sensors will be used for the control of engines. To that purpose positions, velocities or accelerations of moving components will have to be monitored in very harsh environments. In our work an electromagnetic sensor based on the eddy current principle has been designed. Most of the simulations of the physical behavior were performed using the finite-elements program ANSYS. In a first step the sensor’s geometry and its mounting position were adapted to the shape and motion of the component. To that purpose, a modal analysis of the part was performed. In a next step the sensor’s function was evaluated and the sensitivity to be expected was computed. Furthermore the functional optimization yielded the optimum electrical parameters for the subsequent circuit design. In addition to these optimizations the finite elements software was also used for an improvement of the assembly and packaging technology. The most critical issue was the reliability under high temperature operating conditions. With the corresponding simulations different assembly solutions and packaging materials are evaluated. These include ceramic technologies (low temperature cofired ceramic) in comparison to conventional coil designs. On the specific example the paper outlines the prospects and requirements of hardware design for microsystems by consistent application of simulation techniques. 相似文献
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Jeong Beom Kim Sung Je Hong Jong Kim 《Solid-State Circuits, IEEE Journal of》1998,33(8):1266-1272
IDDQ testing can cover the traditional stuck-at-faults as well as other defects that may affect reliability. One of the most critical issues in IDDQ testing is a built-in current sensor (BICS) that can be used to detect abnormal static currents. The most serious problem in the conventional current sensor is performance degradation. The purpose of this work is to present an effective BICS, which has a very small impact on the performance of the circuit under test (CUT). The proposed BICS works in two-modes, the normal mode and the test mode. In the normal mode, our BICS is totally isolated from the CUT. Thus there Is absolutely no performance degradation of the CUT. In the testing mode, our BICS detects the abnormal current caused by permanent manufacturing defects. Furthermore, the BICS requires neither an external voltage reference nor a current source. Hence, the BICS requires less area and is more efficient than the conventional current sensors. The validity and effectiveness of the proposed RIGS are verified through the HSPICE simulation and the chip test. The fabrication was done through “CMPSC8” 0.8 μm n-well process. The testing results show that our BICS operates at a speed of 25 MHz 相似文献
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提出了一种适用于电池供电设备管理的高精度电流传感器。该电流传感器使用SCΔΣADC对10mΩ芯片上金属分流电阻上的比例电压降落进行模数转换。动态带隙基准电路提供了ADC的基准电压,并且检测了分流器温度补偿方案所需的分流器温度。利用相关双采样(CDS)、系统级斩波以及低漏电前端设计使ADC变得更加精确,利用斩波、动态原件匹配(DEM)以及单一室温调节有效抑制了动态带隙基准电路中的误差源。该电流传感器采用标准0.13 μm CMOS工艺制成,面积为1.15mm2,在1.5 V电压条件下电流损耗为55 μA。测量结果显示,相比传统的电流传感器,提出的电流传感器在-5 A至+5 A的电流范围以及-50℃至+85℃的温度范围内,最大偏差为16 μA,最大增益误差为±0.3%,精确度得到了显著提升。 相似文献