近些年来，随着我国居民住宅建设的迅速发展，城市楼房所用电能表的数量也日益增多。现行建筑电气设计常将单块电能表集中挂成一面“表墙”，体积较大，维护管理不便[1]。如在智能小区、学生公寓等场所，分户计量时每层需安装多块电表，
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给施工、抄表、控制等带来诸多困难。本文设计出一种计量精度高、功能全、性能可靠的多回路电能管理终端，并已经在实际中应用中得到了肯定。
1 功能介绍：
本文设计的多回路电能管理终端的主要包括以下功能：
计量：可计量每个回路的尖、峰、平、谷各时段的电能及总电能，精度为1级。
检测：实时检测各回路的相电压、有功功率、无功功率、功率因数、电压频率等。
设置：可以自由设置复费率的时段、时间及通讯参数。
显示：实时显示各回路的用电量。
通信：通过RS485接口进行远程抄表，可支持Modbus与DL/T 645-2007协议。
2 设计方案
本终端的设计包括硬件设计与软件设计两个部分。
2.1硬件设计
主控部分硬件包括：MCU、LED数码显示、时钟电路、RS485通讯、按键输入。其中，显示界面采用的是LED数码管，用户可以通过轮显显示来了解当前的使用电量和剩余电量；通讯采用两路RS485，一路为主控模块与电脑、通讯管理机等设备之间的通讯，另外一路为主控模块与计量模块之间的通讯。
计量部分硬件包括：计量芯片、铁电存储、磁保持控制电路、有功脉冲输出、信号输入。其中，计量芯片对电压、电流信号分别进行采集，并将有功电能数据存储至铁电中，用于后续数据的查看、对比。每个计量部分和主控部分之间采用RS485通讯，以进行数据处理和控制。多回路计量终端采集到的电能最终会存储至铁电中。具体的硬件处理流程如图1所示。
KLA-Tencor AIT 2 4-Channel Motor Control 261408 working
KLA TENCOR IMAGE DATA STORAGE SYSTEM 710-612545-004/?AA
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KLA-Tencor 370-21860-001 Pwr Arcts Power Supply PS-1122
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KLA-Tencor AIT 2 Front Collector Assy. 0032131-001
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KLA-Tencor Lower Octopole/Wein Lens 780-14108-000
KLA-Tencor AIT 2 Rear Collector Assy. 0032129-000
NEAT 330UP Motion Controller KLA-Tencor CRS1010
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