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參數(shù)資料
| 型號： | ADE7758ARW |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Poly Phase Multifunction Energy Metering IC with Per Phase Information |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | MS-013-AD, SOIC-24 |
| 文件頁數(shù)： | 52/68頁 |
| 文件大?。?/td> | 1584K |
| 代理商： | ADE7758ARW |
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ADE7758
Step 11: Calculate the value written to the xVAROS registers
according to the following equations.
Rev. A | Page 52 of 68
Calibration of IRMS and VRMS Offset
IRMSOS and VRMSOS are used to cancel noise and offset
contributions from the inputs. The calibration method is the
same whether calibrating using the pulse outputs or line
accumulation. Reading the registers is required for this
calibration since there is no rms pulse output. The rms offset
calibration should be performed before VAGAIN calibration.
The rms offset calibration also removes offset from the VA
calculation. For this reason, no VA offset register exists in the
ADE7758.
TEST
MIN
MIN
TEST
I
I
I
xVARHR
I
xVARHR
Offset
–
–
×
×
=
(54)
29
2
4
CLKIN
]
:
11
[
×
×
×
+
AccumTime
Offset
xVAROS
(55)
Example—Power Offset Calibration Using Line
Accumulation
This example only shows Phase A of the phase active power
offset calibration. Both active and reactive power offset for all
phases can be calibrated simultaneously using the method
explained in the Power Offset Calibration Using Line
Accumulation section.
The low-pass filter used to obtain the rms measurements is not
ideal, therefore it is recommended to synchronize the readings
with the zero crossings of the voltage waveform and to average a
few measurements when reading the rms registers.
The ADE7758 IRMS measurement is linear over a 500:1 range,
and the VRMS measurement is linear over a 20:1 range. To
measure the voltage VRMS offset (xVRMSOS), measure rms
values at two different nonzero current levels, for example,
V
NOM
and V
NOM
/20. To measure the current rms offset
(IRMSOS), measure rms values at two different nonzero current
levels, for example, I
TEST
and I
MAX
/500). This translates to three
test conditions: I
TEST
and V
NOM
, I
MAX
/500 and V
NOM
, I
TEST
and
V
NOM
/20. Figure 84 shows a flow chart for calibrating the rms
measurements.
For this example,
I
TEST
= 10 A,
I
MIN
= 100 mA,
V
NOM
= 220 V,
Power Factor
= unity,
Frequency
= 50 Hz, and LINECYC =
0xFFF.
At I
TEST
, the example ADE7758 meter shows 192489d in the
AWATTHR (0x01) register after gain calibration at 0xFFF line
cycles. At I
MIN
, the meter shows 1919d in the AWATTHR
register. By using Equation 52, this is equivalent to the 6 LSBs of
offset, therefore, using Equation 53, the value written to
AWATTOS is 94d.
95
.
10
–
1
1
489
,
–
10
1919
=
×
×
=
Offset
39
.
94
2
MHz
10
65
.
13
4
6
×
29
=
×
×
=
AWATTOS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| ADE7758ARWRL | 制造商:Analog Devices 功能描述:Energy Measurement 24-Pin SOIC W T/R 制造商:Analog Devices 功能描述:IC ENERGY METER |
| ADE7758ARWZ | 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(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:* |
| ADE7758ARWZ | 制造商:Analog Devices 功能描述:ENERGY METERING IC 制造商:Analog Devices 功能描述:IC, POLY-PHASE ENERGY METERING, SOIC-24 |
| ADE7758ARWZ | 制造商:Analog Devices 功能描述:IC ENERGY METER 3 PHASE SOIC-24 |
| ADE7758ARWZRL | 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(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:* |
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