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參數(shù)資料
| 型號(hào)： | ADE7753ARSZRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封裝： | ROHS COMPLIANT, MO-150AE, SSOP-20 |
| 文件頁數(shù)： | 20/60頁 |
| 文件大?。?/td> | 938K |
| 代理商： | ADE7753ARSZRL |
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ADE7753
Rev. C | Page 27 of 60
from these measurements. If the voltage rms offset register does
not have enough range, the CH2OS register can also be used.
PHASE COMPENSATION
When the HPF is disabled, the phase error between Channel 1
and Channel 2 is 0 from dc to 3.5 kHz. When HPF is enabled,
Channel 1 has the phase response illustrated in Figure 58 and
the filter. As can be seen from the plots, the phase response is
almost 0 from 45 Hz to 1 kHz. This is all that is required in
typical energy measurement applications. However, despite
being internally phase compensated, the ADE7753 must work
with transducers, which could have inherent phase errors. For
example, a phase error of 0.1° to 0.3° is not uncommon for a
current transformer (CT). 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
ADE7753 provides a means of digitally calibrating these small
phase errors. The ADE7753 allows a small time delay or time
advance to be introduced into the signal processing chain to
compensate for small phase errors. Because the compensation is
in time, this technique should be used only 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 register (PHCAL[5:0]) is a twos comple-
ment signed single-byte register that has values ranging from
0x21 (–31d) to 0x1F (31d).
The register is centered at 0x0D, so that writing 0x0D to the
register gives 0 delay. By changing the PHCAL register, the time
delay in the Channel 2 signal path can change from –102.12 μs
to +39.96 μs (CLKIN = 3.579545 MHz). One LSB is equivalent
to 2.22 μs (CLKIN/8) time delay or advance. A line frequency of
60 Hz gives a phase resolution of 0.048° at the fundamental (i.e.,
360° × 2.22 μs × 60 Hz). Figure 57 illustrates how the phase
compensation is used to remove a 0.1° phase lead in Channel 1
due to the external transducer. To cancel the lead (0.1°) in
Channel 1, a phase lead must also be introduced into Channel 2.
The resolution of the phase adjustment allows the introduction
of a phase lead in increment of 0.048°. The phase lead is achieved
by introducing a time advance into Channel 2. A time advance
of 4.48 μs is made by writing 2 (0x0B) to the time delay block,
thus reducing the amount of time delay by 4.48 μs, or equiva-
lently, a phase lead of approximately 0.1° at line frequency of 60 Hz.
0x0B represents –2 because the register is centered with 0 at 0x0D.
1
0
1
0
1
50
PGA1
V1P
V1N
V1
ADC 1
HPF
24
PGA2
V2P
V2N
V2
ADC 2
DELAY BLOCK
2.24s/LSB
24
LPF2
V2
V1
60Hz
0.1°
V1
V2
CHANNEL 2 DELAY
REDUCED BY 4.48s
(0.1°LEAD AT 60Hz)
0Bh IN PHCAL [5.0]
PHCAL [5:0]
--100s TO +34s
60Hz
02875-0-056
Figure 57. Phase Calibration
FREQUENCY (Hz)
PH
A
SE
(D
egrees)
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–0.1
102
103
104
02875-0-057
Figure 58. Combined Phase Response of the HPF and
Phase Compensation (10 Hz to 1 kHz)
FREQUENCY (Hz)
0.20
40
PH
A
SE
(
D
egrees)
0.18
0.16
0.14
0.12
0.10
0.08
0
0.02
0.04
0.06
45
50
55
60
65
70
02875-0-058
Figure 59. Combined Phase Response of the HPF and
Phase Compensation (40 Hz to 70 Hz)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADE7753-ARSZRL | 制造商:Analog Devices 功能描述: |
| ADE7753XRS | 制造商:Analog Devices 功能描述: |
| ADE7754 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Poly-phase Multi-Function Energy Metering IC with Serial Port |
| 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 |
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