不间断电源解决方案

Release time:2018-07-17
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source:Ameya360
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1、前言

不间断电源是将蓄电池(多为铅酸免维护蓄电池)与主机相连接,通过主机逆变器等模块电路将直流电转换成市电的系统设备。主要用于给单台计算机、计算机网络系统或其它电力电子设备如电磁阀、压力变送器等提供稳定、不间断的电力供应。当市电输入正常时,不间断电源将市电稳压后供应给负载使用,此时的 UPS 就是一台交流式电稳压器,同时它还向机内电池充电;当市电中断(事故停电)时, 不间断电源立即将电池的直流电能,通过逆变器切换转换的方法向负载继续供应 220V 交流电,使负载维持正常工作并保护负载软、硬件不受损坏。不间断电源设备通常对电压过高或电压过低都能提供保护。

不间断电源解决方案

2、方案概述

Ameya360 不间断电源解决方案使用单片机控制的在线式 UPS 系统结构框图。该在线式不间断电源系统有两种工作模式。在通常情况下,市电是正常的,这时输入功率因数校正部分和输出逆变部分同时工作。但是当市电故障时,蓄电池为负载提供电源。这时蓄电池电压经过 DC/DC 隔离后产生的电压在提升得到逆变部分要求的直流电压,该电压再由逆变部分逆变成交流电给负载供电。基于单片机的在线不间断电源系统的电路由带输入功率因数校正的整流滤波部分、逆变部分和 DC/DC 部分组成,其中逆变和 DC/DC 部分由单片机进行控制的双环控制系统,即一个电流环和一个电压环结合控制。并配有由单片机控制的报警及显示电路,使得不间断电源的检测和使用更加可靠方便。在工作过程中,单片机通过 MAX232 实现电平转换,从而可以与 PC 机进行通讯。

不间断电源解决方案

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