前言
FOXBORO PCP-89-V0國內(nèi)民用單相表一般可分為機(jī)械式電能表(感應(yīng)式電能表)和電子式電能表兩大類。過去機(jī)械式電能表的市場保有量比較大，但由于機(jī)械式電能表存在重量大、成本高、信息采集不方便等缺點(diǎn)，因而正在逐漸退出市場；而電子式電能表經(jīng)過近20年的發(fā)展，在技術(shù)上正日趨成熟。
FOXBORO PCP-89-V0 新一代電子式電能表也稱智能電表，該產(chǎn)品具備諸多優(yōu)點(diǎn)，例如功能擴(kuò)展方便；便于信息化集中管理；節(jié)約材料能源；靈敏度高；精度高；一致性好；誤差曲線平穩(wěn)；便于自動化生產(chǎn)；耐機(jī)械振動能力強(qiáng)；重量輕等。因此隨著技術(shù)日趨成熟，此類產(chǎn)品的市場認(rèn)知度顯著提升，現(xiàn)已經(jīng)成為國內(nèi)民用單相表的主流。近幾年來，國內(nèi)各省陸續(xù)推出自己的技術(shù)規(guī)范，但各省的技術(shù)規(guī)范有一定的差異。農(nóng)網(wǎng)表是智能電表的一種，目前國家電網(wǎng)公司已統(tǒng)一了農(nóng)網(wǎng)表的技術(shù)規(guī)范。本文介紹的農(nóng)網(wǎng)表方案完全滿足國家電網(wǎng)公司智能電能表技術(shù)規(guī)范的要求，該方案基于上海海爾集成電路有限公司開發(fā)的一款8位閃存MCU HR6P71F?！?br />
系統(tǒng)方案設(shè)計(jì)
1、基本功能
FOXBORO PCP-89-V0基于微控制器HR6P71F的農(nóng)網(wǎng)表方案主要實(shí)現(xiàn)有功電能信號的采集、電量存儲與顯示，并通過RS485或者紅外的方式通信，實(shí)現(xiàn)信息傳輸?shù)裙δ?。該方案的電能?jì)量部分采用ADE7755芯片，通過對電壓電流回路信號的采集，將電能值轉(zhuǎn)換成相應(yīng)的電能脈沖信號，MCU通過對電能脈沖信號采集和計(jì)算，轉(zhuǎn)換為相應(yīng)的計(jì)量數(shù)值，同時(shí)具備正、反相有功電能計(jì)量的功能。MCU采集到電能信號后，及時(shí)存儲到EEPROM中，保證存儲的數(shù)據(jù)不被丟失，并且能保持10年以上，通過LCD顯示信息，例如電量總數(shù)等。支持RS485通信和紅外通信。在RS485通信情況下，自動抄表系統(tǒng)可根據(jù)電表地址實(shí)現(xiàn)遠(yuǎn)程自動抄表功能，通信距離：不小于1,200m(每兩個(gè)接點(diǎn)之間)，為了安全保護(hù)電表，RS485通信接口必須和電表內(nèi)部電路實(shí)行電氣隔離，并有失效保護(hù)電路。紅外通信距離應(yīng)該大于 5米，通信角度≥±15°，紅外通信和 RS485 通信在物理層必須獨(dú)立，一種通信信道的損壞不得影響另一信道。
2、硬件設(shè)計(jì)
FOXBORO PCP-89-V0該方案在硬件上由三部分組成，一是電能計(jì)量部分，二是MCU控制部分，三是通信部分。電能計(jì)量部分與MCU控制部分通過光電耦銜接，實(shí)現(xiàn)完全隔離，電能計(jì)量部分主要完成有功電能脈沖輸出，用于校表、采集電能量；無源光電隔離型輸出端口；波形是標(biāo)準(zhǔn)方波， 脈沖寬度為80ms±20ms。RS485通信部分與MCU控制部分也是通過光電耦銜接，實(shí)現(xiàn)完全隔離；紅外通信部分與MCU控制部分共同使用一個(gè)電源，沒有隔離。
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