Accurate prediction of backup time in an UPS and its display on user computer monitor screen

Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475) Pub Date : 1999-07-27 DOI:10.1109/PEDS.1999.794596

P. Mukherjee, B. Majumdar, F. A. Talukdar, A. Ganguly, S. K. Biswas

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Abstract

In an UPS, the battery acts as a reservoir of energy. However the available energy is dependent upon several parameters like the charging time, charging rate, self discharge, aging of the cells and the permitted voltage up to which discharge is to be allowed. Thus the stored energy content must be known accurately to predict the backup operation time left in the event of abnormal mains supply, after which the UPS has to be shut down. This paper presents a method of online calculation of the battery backup time depending on the actual rate of discharge and its terminal voltage. This technique takes into account the charge condition of the battery, the self-discharge aging and change in load current to give a true estimate of backup time. This information is sent to the computer via a serial port and is displayed at one corner of the user monitor screen. Such a facility helps the user to save and close all the running programs before the shut down of the UPS.

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准确预测UPS的备份时间，并将其显示在用户计算机监视器屏幕上

在UPS中，电池起着储存能量的作用。然而，可用能量取决于几个参数，如充电时间、充电速率、自放电、电池老化和允许放电的允许电压。因此，必须准确地知道存储的能量含量，以预测在市电供电异常时的备用运行时间，之后UPS必须关闭。本文提出了一种根据实际放电速率及其端电压在线计算电池备用时间的方法。该方法综合考虑了蓄电池的充电情况、自放电老化和负载电流的变化等因素，给出了准确的备用时间估计。该信息通过串行端口发送到计算机，并显示在用户监视器屏幕的一个角落。该功能可帮助用户在UPS关机前保存并关闭所有正在运行的程序。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)

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