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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)： | 37/60頁 |
| 文件大?。?/td> | 938K |
| 代理商： | ADE7753ARSZRL |
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ADE7753
Rev. C | Page 42 of 60
LAENERGYIB(expected) =
))
1
(
/
8
2
/
(
)
(
+
×
CFDEN
CLKIN
PERIOD
LINECYC
CF
INT
IB
expected
IB
The calculated Wh/LSB ratio for the active energy register,
using Equation 39 is 6.378 × 104:
4
10
378
.
6
imp/Wh
200
.
3
)
1
489
(
1
LSB
Wh
×
=
+
=
Watt Offset
Offset calibration allows outstanding performance over a wide
dynamic range, for example, 1000:1. To do this calibration two
measurements are needed at unity power factor, one at Ib and
the other at the lowest current to be corrected. Either
calibration frequency or line cycle accumulation measurements
can be used to determine the energy offset. Gain calibration
should be performed prior to offset calibration.
Offset calibration is performed by determining the active
energy error rate. Once the active energy error rate has been
determined, the value to write to the APOS register to correct
the offset is calculated.
APOS =
CLKIN
Rate
Error
AENERGY
35
2
×
(49)
The AENERGY registers update at a rate of CLKIN/4. The twos
complement APOS register provides a fine adjustment to the
active power calculation. It represents a fixed amount of power
offset to be adjusted every CLKIN/4. The 8 LSBs of the APOS
register are fractional such that one LSB of APOS represents
1/256 of the least significant bit of the internal active energy
register. Therefore, one LSB of the APOS register represents 233
of the AENERGY[23:0] active energy register.
The steps involved in determining the active energy error rate
for both line accumulation and reference meter calibration
options are shown in the following sections.
Calibrating Watt Offset Using a Reference Meter Example
Figure 82 shows the steps involved in calibrating watt offset
with a reference meter.
WRITE APOS VALUE TO THE APOS
REGISTER: ADDR. 0x11
MEASURE THE % ERROR BETWEEN THE
CF OUTPUT AND THE REFERENCE METER
OUTPUT, AND THE LOAD IN WATTS
SET ITEST = IMIN, VTEST = VNOM, PF = 1
02875-A-008
CALCULATE APOS. SEE EQUATION 49.
Figure 82. Calibrating Watt Offset Using a Reference Meter
For this example:
Meter Constant:
MeterConstant(imp/Wh) = 3.2
Minimum Current:
IMIN = 40 mA
Load at Minimum Current:
WIMIN = 9.6 W
CF Error at Minimum Current:
%ERRORCF(IMIN) = 1.3%
CF Numerator:
CFNUM = 0
CF Denominator:
CFDEN = 489
Clock Frequency:
CLKIN = 3.579545 MHz
Using Equation 49, APOS is calculated to be 522 for this
example.
CF Absolute Error = CFIMIN(nominal) CFIMIN(expected)
(50)
CF Absolute Error =
(%ERRORCF(IMIN)) × WIMIN ×
3600
(imp/Wh)
ant
MeterConst
(51)
CF Absolute Error =
Hz
000110933
.
0
3600
200
.
3
6
.
9
100
%
3
.
1
=
×
Then,
AENERGY Error Rate (LSB/s) =
CF Absolute Error ×
1
+
CFNUM
CFDEN
(52)
AENERGY Error Rate (LSB/s) =
0.000110933 ×
05436
.
0
1
490 =
Using Equation 49, APOS is 522.
APOS
=
522
10
579545
.
3
2
05436
.
0
6
35
=
×
APOS
can be represented as follows with CFNUM and WDIV
set at 0:
APOS
=
CLKIN
CFDEN
ant
MeterConst
W
ERROR
IMIN
CF
35
)
(
2
)
1
(
3600
(imp/Wh)
)
(%
×
+
×
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|---|---|
| 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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