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參數(shù)資料
| 型號： | ADE7763ARS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 電源管理 |
| 英文描述： | Single-Phase Active and Apparent Energy Metering IC |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20 |
| 封裝： | MO-150AE, SSOP-20 |
| 文件頁數(shù)： | 24/56頁 |
| 文件大?。?/td> | 1328K |
| 代理商： | ADE7763ARS |
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ADE7763
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 50 and
Figure 51. Figure 52 shows the magnitude response of the filter.
As seen from the plots, the phase response is almost 0 from
45 Hz to 1 kHz, which is all that is required in typical energy
measurement applications. However, despite being internally
phase-compensated, the ADE7763 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). Phase errors can vary from part to part and must be
corrected in order to perform accurate power calculations. The
errors associated with phase mismatch are particularly
noticeable at low power factors. The ADE7763 provides a
means of digitally calibrating these small phase errors by
allowing a short time delay or time advance to be introduced
into the signal processing chain to compensate for these errors.
Because the compensation 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.
Rev. A | Page 24 of 56
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 0Dh, so that writing 0Dh to the register
produces 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 49 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 increments of 0.048°. The phase lead is
achieved by introducing a time advance in Channel 2. A time
advance of 4.44 μs is made by writing 2 (0x0B) to the time delay
block, thus reducing the amount of time delay by 4.44 μs, or
equivalently, a phase lead of approximately 0.1° at line frequency
of 60 Hz. 0x0B represents –2 because the register is centered
with 0 at 0Dh.
1
1
0
1
0
0
1
5
0
PGA1
V1P
V1N
V1
ADC 1
HPF
24
PGA2
V2P
V2N
V2
ADC 2
DELAY BLOCK
2.22
μ
s/LSB
24
LPF2
V2
V1
60Hz
0.1°
V1
V2
CHANNEL 2 DELAY
REDUCED BY 4.44
μ
s
(0.1°LEAD AT 60Hz)
0x0B IN PHCAL [5.0]
PHCAL[5:0]
–102.12
μ
s TO +39.96
μ
s
60Hz
0
Figure 49. Phase Calibration
FREQUENCY (Hz)
P
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–0.1
10
2
10
3
10
4
0
Figure 50. Combined Phase Response of HPF and
Phase Compensation (10 Hz to 1 kHz)
FREQUENCY (Hz)
0.20
40
P
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
0
Figure 51. Combined Phase Response of 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 |
|---|---|
| ADE7763ARSRL | 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP T/R |
| ADE7763ARSZ | 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測量 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:* |
| ADE7763ARSZ | 制造商:Analog Devices 功能描述:IC, SINGLE PHASE ENERGY METER, SSOP-20 |
| ADE7763ARSZRL | 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測量 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:* |
| ADE7763ARSZRL | 制造商:Analog Devices 功能描述:IC, SINGLE PHASE ENERGY METER, SSOP-20 |
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