參數(shù)資料
型號: 71M6515H-IGTR/F
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 模擬信號調(diào)理
英文描述: SPECIALTY ANALOG CIRCUIT, PQFP64
封裝: LEAD FREE, LQFP-64
文件頁數(shù): 20/60頁
文件大?。?/td> 826K
代理商: 71M6515H-IGTR/F
71M6515H
Energy Meter IC
DATA SHEET
JULY 2011
Page: 27 of 60
2005
2011 Teridian Semiconductor Corporation
1.6
A Maxim Integrated Products Brand
We calculate PHADJ from
φ
S, the desired phase lag:
[
]
[
]
+
=
)
2
cos(
)
2
1
(
1
)
tan(
)
2
sin(
)
2
1
(
)
2
cos(
)
2
1
(
2
)
2
1
(
1
)
tan(
2
0
9
0
9
0
9
2
9
20
T
f
T
f
T
f
PHADJ
S
π
φ
π
φ
Finally, we calculate the new calibration current gain coefficient, including compensation for a slight gain increase in the phase
calibration circuit.
2
9
0
9
0
9
20
)
2
1
(
)
2
cos(
)
2
1
(
2
1
))
2
cos(
)
2
1
(
2
(
2
1
_
+
+
=
T
f
T
f
PHADJ
A
I
CAL
I
CAL
XI
NEW
π
Calibration with Five Measurements
The five measurement method provides more orthogonality between the gain and phase error derivations. This method
involves measuring EV, E0, E180, E60, and E300. Again, set all calibration factors to nominal, i.e. CAL_IA = 16384, CAL_VA =
16384, PHADJ_A = 0..
First, calculate AXV from EV:
1.
1
+
=
V
XV
E
A
Calculate AXI from E0 and E180:
2.
1
)
cos(
1
)
0
cos(
)
0
cos(
0
=
=
S
XI
XV
S
XI
XV
A
IV
A
IV
E
φ
3.
1
)
cos(
1
)
180
cos(
)
180
cos(
180
=
=
S
XI
XV
S
XI
XV
A
IV
A
IV
E
φ
4.
2
)
cos(
2
180
0
=
+
S
XI
XV A
A
E
φ
5.
)
cos(
2
180
0
S
XI
XV
E
A
φ
+
=
6.
)
cos(
1
2
)
(
180
0
S
XV
XI
A
E
A
φ
+
=
Use above results along with E60 and E300 to calculate φS.
7.
1
)
60
cos(
)
60
cos(
60
=
IV
A
IV
E
S
XI
XV
φ
1
)
sin(
)
60
tan(
)
cos(
+
=
S
XI
XV
S
XI
XV
A
φ
8.
1
)
60
cos(
)
60
cos(
300
=
IV
A
IV
E
S
XI
XV
φ
1
)
sin(
)
60
tan(
)
cos(
=
S
XI
XV
S
XI
XV
A
φ
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