电子式计数器停电记忆功能电路分析

针对电子式计数器类仪器仪表在突然断电或欠压时,如何才能实现保存断电之前的计数数据,并在供电恢复后从停电之前的数据状态开始继续工作的问题,在分析了工业控制领域实现停电记忆的各种方法及各自的优、缺点的基础上,着重分析了CT系列电子式计数器停电记忆功能的实现方法,通过对CT系列电子式计数器的集成电路芯片工作电压分别为5 V和3.3 V两种情况下的停电记忆部分的电路进行比较,建立起了在这两种不同的工作电压下,因断电时电压变化不同而导致停电记忆信号具有差异的关系。接着从功耗上对使用这两种不同工作电压的集成电路的优劣进行了评价。研究结果表明,CT系列电子式计数器的停电记忆装置简单实用,使用工作电压为3.3 V的集成电路芯片能获得更稳定的停电记忆效果。

Analysis of electronic counter with power-off memory function circuit

Aiming at the problem that the electronic counter instruments in a sudden power failure or undervohage, how can be stored count data before the power off, and the power is restored from the data state before the power off began to continue the work, in recent decades and in the field of industrial control, a variety of methods of the power-off memory function and their advantages and disadvantages were listed. Focuses on the implementation method of CT series electronic counter power-off memory function, through the integrated circuit chip operating voltage of CT series electronic counter respectively circuit power-off memory part of the 5 V and the 3.3 V two kind of situations were compared, and was set up in the two different working voltage, change of voltage after switch off with different, and caused power-off memory signal has the difference. Then, it was evaluated from the power consumption on the use of the two different working voltage integrated circuit performance. The results indicate that power-off memory device of CT series electronic counter is simple and practical, use the working voltage of integrated circuit chip 3.3 V can obtain the power-off memory effect is more stable.