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參數資料
| 型號： | 71M6543H-IGTR/F |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP100 |
| 封裝： | LEAD FREE, LQFP-100 |
| 文件頁數： | 131/157頁 |
| 文件大?。?/td> | 2178K |
| 代理商： | 71M6543H-IGTR/F |
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71M6543F/H and 71M6543G/GH Data Sheet
v1.2
2008–2011 Teridian Semiconductor Corporation
75
3
Functional Description
3.1
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 71M6543 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 yields an accurate
quantity for the momentary energy. Summing-up the momentary energy quantities over time results in
accumulated energy.
Figure 24: Voltage, Current, Momentary and Accumulated Energy
Figure 24 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 20 ms. The application of 240 VAC and
100 A results in an accumulation of 480 Ws (= 0.133 Wh) over the 20 ms 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.
3.2
Battery Modes
Shortly after system power (V3P3SYS) is applied, the 71M6543 is in mission mode (MSN mode). MSN
mode means that the part is operating with system power and that the internal PLL is stable. This mode
is the normal operating mode where the part is capable of measuring 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]
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| 71M6545 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Four-Quadrant Metering, Phase Metrology Processors Flash/RAM Size |
| 71M6545H | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Four-Quadrant Metering, Phase Metrology Processors Flash/RAM Size |
| 71M6545HT-IGT/F | 制造商:Maxim Integrated Products 功能描述:METROLOGY PROCESSORS - Rail/Tube |
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