描述
4)數(shù)據(jù)存儲模塊
該功能模塊主要由支持I2C總線的可擦寫EEP-ROM(AT25C256)和掉電保護(hù)電路組成,主要用于存儲計(jì)算出來的電壓、電流、有功等實(shí)時(shí)值以及每個時(shí)段的有功電能值,還有掉電時(shí)間記錄、電壓電流越上下限報(bào)警記錄和歷史記錄等等。如果模塊掉電,系統(tǒng)中的掉電保護(hù)電路會自動切換到后備電池給外部RAM供電,以保證RAM里所有的數(shù)據(jù)不丟失。
(5)電源
為確保電能表穩(wěn)定可靠的運(yùn)行,電源是電能表設(shè)計(jì)的一個關(guān)鍵。本設(shè)計(jì)采用一路9V電源和一路5V電源來分別給AVRMega16和RS485通信單元供電。通信單元、計(jì)量單元和MCU之間的通信采用光耦進(jìn)行隔離,可提升整個系統(tǒng)的抗干擾能力。眾所周知,電能表的干擾源主要有電網(wǎng)的電壓波動、閃電沖擊和變壓器產(chǎn)生的電磁感應(yīng)等。本設(shè)計(jì)采用壓敏電阻來吸收瞬問高壓沖擊。電源進(jìn)線處則使用磁環(huán)來防止高頻電磁脈沖對電路的干擾和破壞。
2.3軟件設(shè)計(jì)
整個電能表的軟件程序由主程序、系統(tǒng)初始化、電量處理模塊、數(shù)據(jù)存儲、鍵盤中斷、LCD顯示模塊、通信模塊等組成。通過主程序或通過中斷方式可以調(diào)用子程序,以實(shí)現(xiàn)系統(tǒng)的整體功能。
其中主程序可用于完成啟動和系統(tǒng)初始化(包括FLASH、RAM、LCD的設(shè)置、SCI及RTC等的初始化),以及判定時(shí)段,在LCD上顯示電量和時(shí)間等
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①Allen-Bradley(美國AB)系列產(chǎn)品》
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③General electric(通用電氣)系列產(chǎn)品》
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結(jié)構(gòu)的zui現(xiàn)代化的容錯控制器。
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NEW ABB SACE S6 S6N 600 AMP CIRCUIT BREAKER
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ABB EHDB 280 EHDB280C2P-1L 280A DC 120V coil*NEW
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ABB TB84EC Conductivity Analyzer TB84EC2000300
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ABB ASEA BROWN BOVERI DSQC-230,tested warranty
ABB MOTOR DRIVE ACS501-010-4-00?P2
ALLEN BRADLEY 1326AB-B520E-21 1326ABB520E21 SERVO MOTOR
ABB/MOD 300 Graphics Converter,120VAC,PN-GC315AB/A
ABB/MOD 300 Graphics Converter,220VAC,PN-GC315AB/B
ABB ELMO 3HAB4041-1 SERVO MOTOR 3HAB40411
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ABB M33A 090 LB-2 MOTOR NEW M33A090LB2