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參數(shù)資料
| 型號(hào)： | ADE7758ARWZRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 模擬信號(hào)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： | LEAD FREE, MS-013-AD, SOIC-24 |
| 文件頁(yè)數(shù)： | 49/68頁(yè) |
| 文件大?。?/td> | 1584K |
| 代理商： | ADE7758ARWZRL |
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ADE7758
Step 8: Read all six xWATTHR (0x01 to 0x03) and xVAHR
(0x07 to 0x09) energy registers after the LENERGY interrupt
and store the values.
Rev. A | Page 49 of 68
Step 8a: Calculate the values to be written to xWG registers
according to the following equation.
( )
×
×
θ
×
×
×
,
×
=
600
,
000
cos
4
2
12
TEST
V
TEST
I
MC
xWG
[
]
WDIV
xWATTHR
AccumTime
×
0
:
11
(42)
where
Accumulation Time
is
[
]
Selected
Phases
of
No.
Frequency
Line
2
LINECYC
AccumTime
×
×
=
0
:
15
(43)
MC
is the meter constant, θ is the angle between the current
and voltage,
Line Frequency
is read from the FREQ register or is
known, and the
No. of Phases Selected
are the number of ZXSEL
bits set to Logic 1 in LCYCMODE (0x17).
Step 8b: Calculate the values to be written to the xVAG registers
according to the following equation.
( )
×
×
θ
×
×
,
×
,
×
=
600
000
cos
4
2
12
AccumTime
×
11
TEST
V
TEST
I
MC
xVAG
[
]
VADIV
xVAHR
0
:
(44)
Step 9: Write to xWG and xVAG.
Step 10: Set the test system for
I
TEST
,
V
NOM
, and zero power factor
(calibrate VAR gain).
Step 11: Repeat Step 7.
Step 12: Read the xVARHR (0x04 to 0x06) after the LENERGY
interrupt and store the values.
Step 13: Calculate the values to be written to the xVARG
registers (to adjust VARCF to the expected value).
( )
×
×
θ
×
×
,
×
,
×
=
600
000
sin
4
2
12
AccumTime
×
11
TEST
V
TEST
I
MC
xVAG
[
]
VADIV
xVAHR
0
:
(45)
Step 14: Write to xVARG.
Step 15: Calculate the Wh/LSB, VARh/LSB, and VAh/LSB
constants.
xWATTHR
AccumTime
V
I
LSB
Wh
NOM
×
TEST
×
×
600
=
,
(46)
xVAHR
AccumTime
V
600
I
LSB
VAh
NOM
TEST
×
×
×
,
=
(47)
xVARHR
AccumTime
V
600
I
LSB
VARh
NOM
TEST
×
×
×
=
,
(48)
Example—Watt Gain Calibration Using Line Accumulation
This example only shows Phase A watt calibration. The steps
outlined in the Gain Calibration Using Line Accumulation
section show how to calibrate watt, VA, and VAR. All three
phases can be calibrated simultaneously because there are nine
energy registers.
For this example,
I
TEST
= 10 A,
V
NOM
= 220 V,
Power Factor
= 1,
Frequency
= 50 Hz, LINECYC (0x1C) is set to 1FF, and
MC
= 3200 imp/kWhr.
To set APCFNUM (0x45) and APCFDEN (0x46) to the
calculated value to perform a coarse adjustment on the
imp/kW-hr ratio, use Equation 27 to Equation 29:
54
.
130
10
500
220
kH
16
=
×
×
=
z
APCF
NOMINAL
( )
θ
Hz
95
.
cos
600
,
000
,
220
10
×
200
,
=
×
×
×
=
EXPECTED
APCF
227
Hz
95
.
Hz
541
=
=
INT
APCFDEN
Under the test conditions above, the AWATTHR register value
is 24008d after the LENERGY interrupt. Using Equation 42 and
Equation 43, the value to be written to AWG is 02d.
s
AccumTime
7
=
3
50
2
FF
×
1
x
0
×
=
268
.
1
008
,
24
7
600
,
000
,
1
220
10
×
200
,
4
2
12
=
×
×
×
×
×
×
×
=
s
xWG
Using Equation 46, the Wh/LSB constant is
5
–
10
33
.
008
,
24
600
,
7
×
220
×
10
×
=
×
=
LSB
Wh
Phase Calibration Using Line Accumulation
The ADE7758 includes a phase calibration register on each
phase to compensate for small phase errors. Large phase errors
should be compensated by adjusting the antialiasing filters. The
ADE7758’s phase calibration is a time delay with different
weights in the positive and negative direction (see the Phase
Compensation section). Since a current transformer is a source
of phase error, a fixed nominal value may be decided on to load
into the xPHCAL (0x3F to 0x41) registers at power-up. During
calibration, this value can be adjusted for CT-to-CT error.
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