基于RL78/I1C、Si4438主控器件的海外智能电表解决方案
概述
智慧城市的发展,离不开电力能源的支持,电力能源的采集和分析,则依靠智能电表来协调,世界各国以电力的稳定高效、节能环保、安全使用为目标,要求智能电表具备高精度,高品质,高寿命,同时也要求集成度高,互联互通等功能。
本方案基于超高性价比的瑞萨电子海外智能电表专用SOC RL78/I1C及瑞萨电子PLC、Silicon labs Wireless通讯的海外智能电表方案,计量精度可达到0.5s等级,数据通讯更流畅,集成度、成本更优,产品更可靠。
优势
· 瑞萨电子16bit SOC RL78/I1C,内置±1%精度晶体振荡器,POR电路和LVD电路,无需外挂高速晶体,复位及电源监控芯片,外围设计电路简单,有效减小PCB面积,节约成本。内置数据存储器,减小外部EEPROM容量。独立的RTC模块及供电,可省去外挂独立RTC芯片,节约成本。市场专用,大客户批量使用,常备库存,比同资源的其他竞争对手有约10%价格优势。
【RL78/I1C】
Renesas introduces the RL78/I1C - Industry’s lowest power microcontrollers for high-end Smart electricity meter market!
RL78/I1C microcontrollers feature integrated functions for high precision smart electricity metering, such as 24-bit Delta-Sigma A/D operation, AES H/W integration, up to 256 KB flash line-up, a 32-bit MAC (Multiply and Accumulation) function, independent power supply for RTC and enhance battery pin (Vbat) function for AC-off operation, and Hardware zero cross detection. Performance is enhanced with a high temperature coefficient internal reference voltage. A segment LCD driver supports 8-COM.
Key Features:
Item | RL78/I1C | ||||
---|---|---|---|---|---|
Pin Count | 64-pin | 80-pin | 80-pin | 100-pin | |
Part Name | R5F10NLE/G | R5F10NME/G | R5F10NMJ | R5F10NPJ/G | |
Program Flash | 64KB - 128KB | 64KB - 128KB | 256KB | 128KB - 256KB | |
Data flash | 2KB | ||||
SRAM | 6KB - 8KB | 6KB - 8KB | 16KB | 8KB - 16KB | |
System Clock | External | High Speed Clock 1MHz~20MHz, Low Speed Clock 32.768KHz | |||
On Chip Oscillator Clock | HS 1.5MHz~24MHz, MS 1MHz~4MHz, LS 15kHz | ||||
PLL Clock | - | 32KHz | |||
HOCO Clock Frequency Correction Function | Support | ||||
24-bit ΔƩ A/D Convertor | Input Channel Number | 4ch | 3ch | 3ch | 4ch |
SNDR | ~80dB (Gain x 1) | ||||
Sampling Frequency | 3.906kHz/1.953kHz | ||||
PGA | x1, x2, x4, x8, x16, x32 | ||||
Internal Ref. (Temperature coefficient) | 0.8V (10ppm/°C) | ||||
Zero Cross Detection | HW Zero Cross Detection | ||||
8/10-bit A/D Convertor | 4ch | 6ch | |||
32-bit Multiply- Accumulator | Support | ||||
LCD | Segment//COM | 15/8, 19/4 | 30/8, 34/4 | 30/8, 34/4 | 38/8, 42/4 |
LCD Drive Voltage Generation Method | Int. Voltage Boost/ Capacitor Split/ Ext. Resistance Split Division | ||||
Timer Function | 16-bit Timer Array Unit : 8ch, 12-bit Interval Timer: 1ch, 8-bit Interval Timer: 4ch | ||||
Independent Power Supply RTC | 1ch | ||||
Serial I/F | CSI0/UART0/Simple I2C0 | 1ch | |||
CSI1/UART1/ Simple I2C1 | 1ch | ||||
UART2/IrDA | - | 1ch | |||
CSI3/UART3/ Simple I2C3 | 1ch | ||||
Multi-Master I2C | 1ch | ||||
Data Transfer Controller | 29 Sources | 31 Sources | |||
Event Link Controller | Event Generator 22Types, Event Output Selection 5 Types | ||||
Battery Backup Function | CPU | VDD/VBAT | |||
ΔƩ A/D Convertor | VDD/VBAT | ||||
RTC | VRTC (Independent Power Supply) | ||||
Voltage Detection (LVD) | Internal VDD, VDD pin, VBAT pin, VRTC pin, External pin | ||||
AES HW | Cipher Modes GCM/ECB/CBC, Encryption key length 128/192/256-bit | ||||
Key Interrupt Function | 5-pin | 8-pin | |||
Other Peripheral Function | Watch Dog Timer, Power On Reset (POR), Safety Functions | ||||
Power Supply Voltage Range | 1.7V~5.5V | ||||
Operating Ambient Temperature | - 40 to 85°C |
Pin Count / Memory Size Lineup:
Program Flash
SRAM
256KB 16KB | ● | ● | |
---|---|---|---|
128KB 8KB | ● | ● | ● |
64KB 6KB | ● | ● | |
Pins Package | 64 LFQFP | 80 LFQFP | 100 LFQFP |
Block Diagram:
· 瑞萨电子电力线载波模块CPX2,内置PHY和DSP,完全支持G3、PRIME标准,支持多个频段(CENELEC,FCC,ARIB) ,专用于海外电力通讯市场。优越的动态范围和灵敏度保证高通讯速率和稳定。开放式架构,允许灵活的系统分区,集成度高,外围器件少,可选择最适合的单片机降低方案成本。提供完整的测试实用程序和应用笔记(原理图,PCB刻录文件),软件调制解调器库,使客户设计简单,缩短研发周期。
· Silicon Labs 无线收发器SI4438,针对仪器仪表行业425Mhz~525MHhz 频率范围;发射功率20dBm,接收灵敏度-124dBm,整体链路预算可达到144dBm,空旷环境下实测3.2km的通信距离@490MHz、2.4kbps、 4.8k Deviation、RSSI -65dBm,通讯稳定且灵敏度还有较大余量。功耗非常低,standby 模式寄存器保持功耗仅40nA,节省系统能耗;RF 射频链路包含开关最多只需12个器件,方便布局布线和硬件设计。开发设计采用GUI配置,开发简单,缩短开发周期。大批量客户使用,供货充足,超高性价比。
【Si4438】
HIGH-PERFORMANCE, LOW-CURRENT TRANSCEIVER
Features
> Frequency range = 425–525 MHz
> Receive sensitivity = –124 dBm
> Modulation
》(G)FSK
》OOK
> Max output power
》+20 dBm
> Low active power consumption
》14 mA RX
> Ultra low current powerdown modes
》30 nA shutdown, 50 nA standby
> Data rate = 100 bps to 500 kbps
> Fast wake and hop times
> Power supply = 1.8 to 3.6 V
> Excellent selectivity performance
》58 dB adjacent channel
》75 dB blocking at 1 MHz
> Antenna diversity and T/R switch control
> Highly configurable packet handler
> TX and RX 64 byte FIFOs
> Auto frequency control (AFC)
> Automatic gain control (AGC)
> Low BOM
> Low battery detector
> Temperature sensor
> 20-Pin QFN package
> IEEE 802.15.4g ready
> China regulatory
Applications
> China smart meters
Description
Silicon Laboratories' Si4438 is a high-performance, low-currenttransceivers covering the sub-GHz frequency bands from 425 to525 MHz. The Si4438 is targeted at the Chinese smart meter market andis especially suited for electric meters. This device is footprint- andpin-compatible with the Si446x radios, which provide industry-leadingperformance for worldwide sub-GHz applications. The radios are part ofthe EZRadioPRO® family, which includes a complete line of transmitters,receivers, and transceivers covering a wide range of applications. Allparts offer outstanding sensitivity of –124 dBm while achieving extremelylow active and standby current consumption. The 58 dB adjacent channelselectivity with 12.5 kHz channel spacing ensures robust receiveoperation in harsh RF conditions. The Si4438 offers exceptional outputpower of up to +20 dBm with outstanding TX efficiency. The high outputpower and sensitivity results in an industry-leading link budget of 144 dBallowing extended ranges and highly robust communication links.
Functional Block Diagram
【智能电表】
智能电表是智能电网的智能终端,它已经不是传统意义上的电能表,智能电表除了具备传统电能表基本用电量的计量功能以外,为了适应智能电网和新能源的使用它还具有双向多种费率计量功能、用户端控制功能、多种数据传输模式的双向数据通信功能、防窃电功能等智能化的功能,智能电表代表着未来节能型智能电网最终用户智能化终端的发展方向。
作为经济刺激计划的一部分,国家电网在2009年7月确定了智能电网的发展规划。2009-2011年为规划试点阶段,重点完成坚强智能电网的整体规划,开展关键性、基础性、共用性技术研究,进行技术和应用试点;2012-2015年为全面建设阶段,加快特高压电网和城乡配电网建设,初步形成智能电网运行控制和互动服务体系;2016-2020年为引领提升阶段,全面建成统一的“坚强智能电网”。
2009年8月和2010年2月,国家电网公司先后启动了第一批9项和第二批12项试点工程。这些试点工程的开展为“十二五”期间坚强智能电网的全面建设,打下了良好基础。
根据规划,“十二五”期间,国家电网公司电网智能化投资的总额为2861.1亿元,年均投资为572.2亿元,较“十一五”250亿元的年均投资大幅翻番,涉及到发电、输电、变电、配电、用电及调度等六个环节。随着智能电网建设的展开,智能化投资将明显增加,二次设备投资占比将由不足5%提升至12%-15%。
中国智能电网进入了全面建设阶段,对智能电表产生了巨大的市场需求。
目前国家电网已经连续多年对智能电表进行招投标采购。2012年,国家电网对智能电表的招标量达到7588.69万只,完成了规划量的138%,同比增长12.17%。这种增长主要源于政府从2012年4月开始大规模投资基础设施建设,以及全国7月份全面实施阶梯电价制度。预计智能电表采购活动将保持增长势头,未来三年安装速度将加快。
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