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參數資料
| 型號： | 71M6521DE-IMR/F |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, QCC68 |
| 封裝： | LEAD FREE, LQFN-68 |
| 文件頁數： | 47/103頁 |
| 文件大小： | 1691K |
| 代理商： | 71M6521DE-IMR/F |
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71M6521DE/71M6521FE
Energy Meter IC
DATA SHEET
OCTOBER 2010
Page: 48 of 103
2005-2010 Teridian Semiconductor Corporation
v1.1
A Maxim Integrated Products Brand
19-5370; 10/10
FUNCTIONAL DESCRIPTION
Theory of Operation
The energy delivered by a power source into a load can be expressed as:
∫
=
t
dt
t
I
t
V
E
0
)
(
)
(
Assuming phase angles are constant, the following formulae apply:
P = Real Energy [Wh] = V * A * cos φ* t
Q = Reactive Energy [VARh] = V * A * sin φ * t
S = Apparent Energy [VAh] =
2
Q
P
+
For a practical meter, not only voltage and current amplitudes, but also phase angles and harmonic content may change
constantly. Thus, simple RMS measurements are inherently inaccurate. A modern solid-state electricity meter IC such as the
Teridian 71M6521DE/FE functions by emulating the integral operation above, i.e. it processes current and voltage samples
through an ADC at a constant frequency. As long as the ADC resolution is high enough and the sample frequency is beyond
the harmonic range of interest, the current and voltage samples, multiplied with the time period of sampling will yield an
accurate quantity for the momentary energy. Summing up the momentary energy quantities over time will result in accumulated
energy.
-500
-400
-300
-200
-100
0
100
200
300
400
500
0
5
10
15
20
Current [A]
Voltage [V]
Energy per Interval [Ws]
Accumulated Energy [Ws]
Figure 15: Voltage. Current, Momentary and Accumulated Energy
Figure 15 shows the shapes of V(t), I(t), the momentary power and the accumulated power, resulting from 50 samples of the
voltage and current signals over a period of 20ms. The application of 240VAC and 100A results in an accumulation of 480Ws
(= 0.133Wh) over the 20ms period, as indicated by the Accumulated Power curve.
The described sampling method works reliably, even in the presence of dynamic phase shift and harmonic distortion.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 71M6521DH | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Energy Meter ICs |
| 71M6521DH-IGT/F | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Energy Meter ICs |
| 71M6521DH-IGTR/F | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Energy Meter ICs |
| 71M6521FE | 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Energy Meter IC |
| 71M6521FE-DB | 功能描述:開發板和工具包 - 8051 71M6521FE Demo Brd RoHS:否 制造商:Silicon Labs 產品:Development Kits 工具用于評估:C8051F960, Si7005 核心: 接口類型:USB 工作電源電壓: |
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