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| 型号： | 71M6511-DB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/115页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO 71M6511 ENERGY METER |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | 71M6511 |
| 已供物品： | 2 个板，线缆，CD，电源 |
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71M6511/71M6511H Demo Board User’s Manual
1.8.2 USING THE DEMO BOARD FOR ENERGY MEASUREMENTS
The 71M6511/6511H Demo Board was designed for current transformer (CT), current shunt, or current
shunt/CT combinations. The demo code is designed to support both operating modes. The Demo Boards
are normally shipped in CT configuration .
1.8.3 USING THE DEMO BOARD IN CT MODE
The Demo Board may immediately be used with current transformers having 2,000:1 winding ratio and is
programmed for a Kh factor of 1.0 and (see Section 1.8.4 for adjusting the Demo Board for transformers with
different turns ratio).
Once voltage is applied and load current is flowing, the red LED D5 (controlled by pin DIO6) will pulse each
time an energy sum of 1.0 Wh is collected. The LCD display will show the accumulated imported energy in
Wh when set to display mode 3 (command >M3 via the serial interface). If no energy is displayed, reversed
polarity of the current channel may be the reason. The command >M4 will display the exported energy.
Similarly, the red LED D6 (controlled by pin DIO7) will pulse each time a reactive energy sum of 1.0 VARh is
collected. The LCD display will show the accumulated energy in VARh when set to display mode 5
(command >M5 via the serial interface).
1.8.4 ADJUSTING THE DEMO BOARD TO DIFFERENT CURRENT TRANS-
FORMERS
The Demo Board is prepared for use with 2000:1 current transformers (CTs). This means that for the
unmodified Demo Board, 208A on the primary side at 2000:1 ratio result in 104mA on the secondary side,
causing 177mV at the 1.7 ? resistor pairs R24/R25, R36/R37, R56/R57 (2 x 3.4 ? in parallel).
In general, when IMAX is applied to the primary side of the CT, the voltage V in at the IA or IB input of the
71M6511 IC is determined by the following formula:
V in = R * I = R * IMAX /N
where N = transformer winding ratio, R = resistor on the secondary side
If, for example, IMAX = 208A are applied to a CT with a 2500:1 ratio, only 83.2mA will be generated on the
secondary side, causing only 141mV. The steps required to adapt a 71M6511 Demo Board to a transformer
with a winding ratio of 2500:1 are outlined below:
1)
2)
3)
The formula R x = 177mV/(IMAX/N) is applied to calculate the new resistor R x . We calculate Rx to
2.115 ?
Changing the resistors R24/R25, R106/R107 to a combined resistance of 2.115 ? (for each pair) will
cause the desired voltage drop of 177mV appearing at the IA, or IB inputs of the 71M6511 IC.
WRATE should be adjusted to achieve the desired Kh factor, as described in 1.8.2.
Simply scaling IMAX is not recommended, since peak voltages at the 71M6511 inputs should always be in
the range of 0 through ±250mV (equivalent to 177mV rms). If a CT with a much lower winding ratio than
1:2,000 is used, higher secondary currents will result, causing excessive voltages at the 71M6511 inputs.
Conversely, CTs with much higher ratio will tend to decrease the useable signal voltage range at the
71M6511 inputs and may thus decrease resolution.
Revision 5.4
? 2005-2007 TERIDIAN Semiconductor Corporation
Page: 25 of 115
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 71M6511H | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Single-Phase Energy Meter IC |
| 71M6511H-DB | 功能描述:开发板和工具包 - 8051 71M6511H Demo Brd RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:C8051F960, Si7005 核心: 接口类型:USB 工作电源电压: |
| 71M6511H-IGT | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Single-Phase Energy Meter IC |
| 71M6511H-IGT/F | 功能描述:计量片上系统 - SoC Highly Integrated SoC w/MCU Core RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel |
| 71M6511H-IGTR | 制造商:Maxim Integrated Products 功能描述:RESID. HI PRECISION METR (1P, .1%) - Tape and Reel |
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