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參數資料
| 型號： | ADE7754 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | ADE7754 |
| 中文描述： | ADE7754 |
| 文件頁數： | 16/44頁 |
| 文件大小： | 630K |
| 代理商： | ADE7754 |
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REV. PrG 01/03
PRELIMINARY TECHNICAL DATA
ADE7754
–
16
–
PHASE COMPENSATION
When the HPFs are disabled the phase error between the
current channel (IA, IB and IC) and the voltage channel (VA,
VB and VC) is zero from DC to 3.3kHz. When the HPFs are
enabled, the current channels have a phase response illus-
trated in Figure 16a & 16b. Also shown in Figure 16c is the
magnitude response of the filter. As can be seen from the
plots, the phase response is almost zero from 45Hz to 1kHz,
This is all that is required in typical energy measurement
applications.
-0.01
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0
100
200
300
400
500
600
700
800
900 1000
Frequency (Hz)
Phase
(Degree)
Figure 16a
–
Phase response of the HPF & Phase
Compensation (10Hz to 1kHz)
-0.004
-0.002
0
0.002
0.004
0.006
0.008
0.01
40
45
50
55
60
65
70
Frequency (Hz)
Phase
(Degree)
Figure 16b - Phase response of the HPF & Phase
compensation (40Hz to 70Hz)
-0.004
-0.002
0
0.002
0.004
0.006
0.008
0.01
44
46
48
50
52
54
56
Frequency (Hz)
Phase
(Degree)
Figure 16c
–
Gain response of HPF & Phase Compensation
(deviation of Gain as % of Gain at 54Hz)
However despite being internally phase compensated, the
ADE7754 must work with transducers which may have
inherent phase errors. For example a phase error of 0.1° to
0.3° is not uncommon for a CT (Current Transformer).
These phase errors can vary from part to part and they must
be corrected in order to perform accurate power calculations.
The errors associated with phase mismatch are particularly
noticeable at low power factors. The ADE7754 provides a
means of digitally calibrating these small phase errors. The
ADE7754 allows a small time delay or time advance to be
introduced into the signal processing chain in order to
compensate for small phase errors. Because the compensa-
tion is in time, this technique should only be used for small
phase errors in the range of 0.1° to 0.5°. Correcting large
phase errors using a time shift technique can introduce
significant phase errors at higher harmonics.
The Phase Calibration registers (APHCAL, BPHCAL and
CPHCAL) are 2’s complement 5-bit signed registers which
can vary the time delay in the voltage channel signal path from
–19.2μs to +19.2μs (CLKIN = 10MHz). One LSB is
equivalent to 1.2μs. With a line frequency of 50Hz this gives
a phase resolution of 0.022° at the fundamental (i.e., 360° x
1.2μs x 50Hz).
Figure 17 illustrates how the phase compensation is used to
remove a 0.091° phase lead in IA of the current channel due
to some external transducer. In order to cancel the lead
(0.091°) in IA of the current channel, a phase lead must also
be introduced into VA of the voltage channel. The resolution
of the phase adjustment allows the introduction of a phase
lead of 0.086°. The phase lead is achieved by introducing a
time advance into VA. A time advance of 4.8μs is made by
writing -4 (1Ch) to the time delay block (APHCAL[4:0]),
thus reducing the amount of time delay by 4.8μs -
see
Calibration of a 3-phase meter based on the ADE7754
.
VAP
VN
ADC
PGA2
1
VA
24
LPF2
HPF
IAP
IAN
ADC
PGA1
IA
24
0
7
APHCAL[4:0]
-19.2μs to +19.2μs
PHASE
CALIBRATION
±0.69 @ 50Hz, 0.022
±0.83 @ 60Hz, 0.024
V1
V2
0.1
50Hz
IA
VA
50Hz
0
0
0
1
1
0
1
0
VA delayed by 4.8μs
(-0.086 @ 50Hz)
1Ch
Figure 17
–
Phase Calibration
相關PDF資料 |
PDF描述 |
|---|---|
| ADE7754AR | ADE7754 |
| ADE7754ARRL | ADE7754 |
| ADE7755AN-REF | Energy Metering IC with Pulse Output |
| ADE7755ARSRL | Energy Metering IC with Pulse Output |
| ADE7755 | Energy Metering IC with Pulse Output |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ADE7754AR | 制造商:Analog Devices 功能描述:Energy Measurement 24-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:THREE PHASE ENERGY METER IC W/WATT & VA - Bulk 制造商:Analog Devices 功能描述:IC ENERGY METER |
| ADE7754ARRL | 制造商:Analog Devices 功能描述:Energy Measurement 24-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:THREE PHASE ENERGY METER IC W/WATT & VA - Bulk |
| ADE7754ARZ | 功能描述:IC ENERGY METERING 3PHASE 24SOIC 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:* |
| ADE7754ARZRL | 功能描述:IC ENERGY METERING 3PHASE 24SOIC 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:* |
| ADE7755 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC with Pulse Output |
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