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运算放大器 -工业控制精度的应用需求

由  Keith Spence 发布  - 2019-07-31 

工业电子控制的发展要求有测量和精确控制设备位置、角度和旋转的能力。这些应用,如装配机器人、表面和阀门致动器,不仅有潜力提供更高质量的成品,还可以让工人从恶劣的环境中撤离,提高安全。

随着应用从过去的纯机械转向现在的混合机械和电气系统,机械工业设备必须在广泛变化的条件下运行,这提出了挑战。为使工业集成电路能够实现这些能力,在各种环境条件下的精度是绝对要求。这些新系统必须在相同的环境中运行,并且具有与它们所替换的机械系统相同或比其更高的可靠性。

当我们想到机械系统时,首先想到的是运动。一些东西需要转动,它需要向上、向下、向左或向右移动。使用数字控制实现真实世界运动的一个关键要素是解析器,解析器控制系统的运动。驱动解析器的关键半导体器件是运算放大器。这类要求的一个例子如下所示,解析器电路可用于工业机器人手臂等应用。(图1)在这个例子中,信号传递给运算放大器,从而驱动解析器旋转工业机器人的手臂。

1

精确运动、旋转度或直线运动测量不仅要求精密,而且要求时间和温度的一致性。无论世界各地的工厂位置,由过程控制器发起的输入在所有极端环境都产生相同的运动很重要。同样重要的是,从交付的第一天起就有一致的移动,并在整个10多年的工业生命周期中提供一致的运动。

安森美半导体提供两种精密运算放大器NCS21911和NCV21911,是极佳的选择,能在宽温度范围(-40℃至125 ℃)满足精确性能的要求,并在工业市场所需的多年运行中保持这种性能。精密输入偏置电压和精密输入偏置电压随温度漂移的规格支持工业机器人应用于许多领域,如汽车制造。采用的创新技术是零漂移,大多数运算放大器的性能随着温度的变化和产品的老化而不同。零漂移的创新之处在于,运算放大器在内部自校正性能漂移。同样的零漂移技术,用于实现随温度非常低的偏移漂移,也校正了输入偏移电压随时间的漂移。见表1。

1NCV21911

工业系统设计人员的任务是设计必须在极端环境条件下运行的系统,极端环境条件涵盖在北极勘探石油和天然气、安全穿越热带巴拿马运河。NCS(V)21911的零漂移技术旨在通过自校正以前必须由系统设计人员来校正的环境变化,使设计人员的工作更容易。同样的技术也适用于其他应用,包括航空、汽车和体重秤,为每种应用都带来许多好处。

请阅读零漂移精密运算放大器:斩波稳定结构的优势及限制以了解更多。了解关于我们的工业电源及运动方案的更多信息。

标签:Industrial, Automotive
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