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參數資料
| 型號： | ADE7762 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Polyphase Energy Metering IC with Phase Drop Indication |
| 中文描述： | 多相電能計量IC降表明了相 |
| 文件頁數： | 21/28頁 |
| 文件大?。?/td> | 363K |
| 代理商： | ADE7762 |
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Preliminary Technical Data
ADE7762
DIGITAL-TO-FREQUENCY CONVERSION
After multiplication, the digital output of the low-pass filter
contains the active power information of each phase. However,
since this LPF is not an ideal brick wall filter implementation, the
output signal also contains attenuated components at the line
frequency and its harmonics, that is, cos(hωt), where h = 1, 2, 3 ….
Rev. PrB | Page 21 of 28
The magnitude response of the filter is given by
1
|
|
( )
f
2
8
1
+
=
f
H
(10)
where the 3 dB cutoff frequency of the low-pass filter is 8 Hz.
For a line frequency of 50 Hz, this would give an attenuation of
the 2ω(100 Hz) component of approximately 22 dB. The
dominating harmonic is twice the line frequency, that is,
cos(2ωt), due to the instantaneous power signal. Figure 30
shows the instantaneous active power signal at the output of the
CF, which still contains a significant amount of instantaneous
power information, cos(2
ω
t).
This signal is then passed to the digital-to-frequency converter
where it is integrated (accumulated) over time to produce an
output frequency. This accumulation of the signal suppresses or
averages out any non-dc component in the instantaneous active
power signal.
The average value of a sinusoidal signal is zero. Thus, the
frequency generated by the ADE7762 is proportional to the
average active power. Figure 30 shows the digital-to-frequency
conversion for steady load conditions, that is, constant voltage
and current.
The frequency output CF varies over time, even under steady load
conditions (see Figure 30). This frequency variation is primarily
due to the cos(2ωt) components in the instantaneous active power
signal. The output frequency on CF can be up to 160× higher than
the frequency on F1 and F2. The higher output frequency is
generated by accumulating the instantaneous active power signal
over a much shorter time, while converting it to a frequency. This
shorter accumulation period means less averaging of the cos(2ωt)
component. Therefore, some of this instantaneous power signal
passes through the digital-to-frequency conversion.
Where CF is used for calibration purposes, the frequency counter
should average the frequency to remove the ripple and obtain a
stable frequency. If CF is being used to measure energy, for
example, in a microprocessor-based application, the CF output
should also be averaged to calculate power. Because the outputs F1
and F2 operate at a much lower frequency, significant averaging of
the instantaneous active power signal is carried out. The result is a
greatly attenuated sinusoidal content and a virtually ripple-free
frequency output on F1 and F2, which are used to measure energy
in a stepper-motor based meter.
LPF TO EXTRACT
REAL POWER
(DC TERM)
Σ
Σ
MULTIPLIER
LPF
MULTIPLIER
LPF
MULTIPLIER
LPF
Σ
DIGITAL-TO-
FREQUENCY
DIGITAL-TO-
FREQUENCY
F1
F2
CF
VA
IA
VB
IB
VC
IC
F
CF
F
TIME
F1
ω
cos(2
ω
t)
ATTENUATED BY LPF
2
ω
FREQUENCY – RAD/S
2
V× I
0
INSTANTANEOUS REAL POWER SIGNAL
(FREQUENCY DOMAIN)
|X|
|X|
|X|
ABS
TIME
0
Figure 30. Active Power-to-Frequency Conversion
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| ADE7762ARW | Polyphase Energy Metering IC with Phase Drop Indication |
| ADE7762ARW-RL | Polyphase Energy Metering IC with Phase Drop Indication |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADE7762ARW | 制造商:AD 制造商全稱:Analog Devices 功能描述:Polyphase Energy Metering IC with Phase Drop Indication |
| ADE7762ARW-RL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Polyphase Energy Metering IC with Phase Drop Indication |
| ADE7762ARWZ | 功能描述:IC ENERGY METERING 3PHASE 28SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測量 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:* |
| ADE7762ARWZ-RL | 功能描述:IC ENERGY METERING 3PHASE 28SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測量 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:* |
| ADE7763 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Single-Phase Active and Apparent Energy Metering IC |
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