锁相技术相关专辑 38册 209M用数字锁相环电路实现高精度宽范围频率控制.pdf
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上传时间: 2014-05-05
上传用户:时代将军
数字处理及显示技术专辑 106册 913M锁相环电路设计和调试心得 4页 0.1M.pdf
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上传时间: 2014-05-05
上传用户:时代将军
开关电源相关专辑 119册 749M开关电源中电流检测电路的探讨.pdf
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上传时间: 2014-05-05
上传用户:时代将军
电学中的测量技术涉及范围非常广,电流测量在电学计量中占有非常重要的位置。如何精确地进行电流测量是精密测量的一大难题。传统的电流检测电路多采用运算放大芯片与片外电流检测电路相结合的方式,电路集成度很低,需要较多的接口和资源才能完成对电路的检测。本文把所有电路部分都集成在一块芯片上,包括检测电阻,运算放大器电路及模拟转数字转换电路,从而在电路内部可以进行电流检测,使电路更好的集成化。前置电路使用二级共源共栅结构的运算放大器,减小沟道长度调制效应造成的电流误差。10位SAR ADC中采用电容驱动能力强的传输门保证了模数转化器的有效精度。比较器模块采用再生锁存器与迟滞比较器作为基础单元组合解决精密测量的问题。本设计可以作为嵌入芯片内的一小部分而检测芯片中的微小电流1mA~100mA,工作电压在1.8v左右,电流检测精度预期达到10uA的需求。The measurement technology in electricity involves a wide range,and current measurement plays a very important position in electrical measurement.How to accurately measure current is a big problem in precision measurement. The traditional current detecting circuit adopts the combination of the operational amplifier chip and theoff-chip current detecting circuit, The circuit integration is very low, and more interfaces and resources are needed tocomplete the circuit detection.This topic integrates all the circuit parts into one chip, including detection resistance, operational amplifier circuit andanalog to digital conversion circuit. Highly integrated circuit makes the external resources on the chip more intensive,so that current detection can be carried out inside the circuit, so that the circuit can be better integrated. Thefront-end circuit of this project uses two-stage cascade operational amplifier and cascade tube to reduce the currenterror caused by channel length modulation effect. In 10-bit SAR ADC, the transmission gate with strong capacitivedriving ability ensures the effective accuracy of the analog-to-digital converter. Comparator module uses regenerativelatch and hysteresis comparator as basic unit to solve the difficult problem of precision measurement. This topic can beused as a small part of the embedded chip to detect the micro-current in the chip 1 mA~100 mA, the working voltageis about 1.8v, and the current detection accuracy is expected to reach the requirement of 10 uA.
上传时间: 2022-04-03
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为适应双向DC/DC功率变换的电流采样需求,一种高精度高边电流采样电路被提出。其基本思想是在功率电路的高边串入采样电阻,借助电流镜原理并引入偏置电流电路,将双向电流均转换为正向电压输出。通过理论分析与仿真结合的方法对电流镜采样原理及4种不同的偏置电流电路方案进行对比,最后通过实验数据验证了高精度高边电流采样电路的有效性。实验数据表明,该采样电路可在-25~75℃的温度工作范围内,针对-10~+10 A范围内的电流采样实现优于5%的采样精度。Current sensing plays an important role in controlling,monitoring or protection functions of power systems.To meet the current sensing requirement of bidirectional DC/DC converters,a high-accuracy bidirectional current sensing circuit is proposed.The proposed current sensing circuit inserts a resistor in the path of the current to be sensed,while the current mirror and biased current circuit are introduced.Therefore,the bidirectional current can be expressed by positive voltage.By theoretical analysis and simulation,the sampling theory is analyzed and four biased current circuits are compared.At last,experimental results verified the proposed method.It is demonstrated that the proposed current sensing circuit can achi...
上传时间: 2022-04-22
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数控直流电流源电路设计图
标签: 数控直流电流源
上传时间: 2022-06-29
上传用户:xsr1983
ACS712电流检测电路和IR2104半桥驱动电路设计电路图
标签: acs712 电流检测电路 ir2104 驱动电路 电路图
上传时间: 2022-07-22
上传用户:XuVshu
介绍了广泛应用于各种电流模式电路的第二代电流控制电流传输器原件的跨导线性环特性和端口特性,以及其基本组成共源共栅电流镜,并提出了基于共源共栅电流镜的新型COMS电流传输器。在此基础上,设计了基于电流控制电流传输器的电流模式积分电路,并利用Hspice软件进行输入为正弦波和方波时的输出波形的仿真验证。
上传时间: 2013-10-22
上传用户:wtrl
介绍了平均电流控制BOOST—PFC电路的原理,建立了电流环和电压环的小信号简化模型,讨论了觑环反馈环节的设计原则和方法,提出最优设计的思想和敷学模型,并以一种BOOSTPFc电路为例进行优化设计,计算模拟结栗显示优化后有关指标好于优化前。
上传时间: 2013-11-08
上传用户:781354052
摘要:分析了影响同步电动机矢m:控制电流控制环动态特性的主要因索.指出同步电动机反电动势是 其中最重要的{一扰因索针对通常采用的F I(比例一积分)电流调 y器因下作频带的限制无法在较高转速时 抑制反电动势的影响.提出了前馈补偿和变电流环增益的设计方法.少}应用于基于数-f_信写处理器的矢m:控 制系统给出了系统结构及软硬件设计方案实验结果表明.该系统硬件简的一控制精l夏高.动态}h I能良好(.caj)
上传时间: 2016-05-22
上传用户:奇奇奔奔