一、概述峰值保持电路是一种能跟随输入信号变化并能将最大值记忆下来的电路。在工业过程自动检测中往往需要将某些物理量如温度、压力等最大值保留下来,以供记录、分析用。如钢水测温,一般采用消耗式热电偶进行插入式测量。热电偶在伸入钢水、测得最高温的瞬间有可能烧断,使信号突然消失,影响测量。若能将热电偶烧断前的瞬时温度值保留,则可避免断偶时的影响。下面介绍的峰值保持电路提供了保留瞬时值的手段。二、峰值保持电路工作原理各类峰值保持电路主要由比较器、寄存器、模拟开关或传输门等组成,如图1所示。寄存器中内容的 I. Overview The peak hold circuit is a circuit that follows the change of the input signal and can memorize the maximum value. In the industrial process of automatic detection often need some physical quantities such as temperature, pressure and other maximum retained for recording and analysis purposes. Such as molten steel temperature, the general consumption of thermocouple plug-in measurement. Thermocouple into the molten steel, the highest temperature measured the moment may blow, the signal suddenly disappear, affecting the measurement. If you can thermocouple before the instantaneous temperature value is retained, you can avoid the impact of broken even. The peak hold circuit described below provides a means of preserving the instantaneous value. Second, the peak hold circuit works Various types of peak hold circuit mainly by the comparator, registers, analog switches or transmission gate and other components, shown in Figure 1. The contents of the register