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參數(shù)資料
| 型號： | EVAL-ADE7763EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Single-Phase Active and Apparent Energy Metering IC |
| 中文描述： | 單相有功功率和視在電能計量IC |
| 文件頁數(shù)： | 41/56頁 |
| 文件大小： | 1328K |
| 代理商： | EVAL-ADE7763EB |
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ADE7763
Calibrating Phase w
With an accurate source, line cycle accumulation is a good
method of calibrating phase error. The value of LAENERGY
must be obtained at two power factors, PF = 1 and PF = 0.5
inductive.
Rev. A | Page 41 of 56
ith an Accurate Source Example
SET HALF LINE CYCLES FOR ACCUMULATION
IN LINECYC REGISTER ADDR. 0x1C
SET I
TEST
= I
b
, V
TEST
= V
NOM
, PF = 0.5
CALCULATE PHCAL. SEE EQUATION 55.
SET MODE FOR LINE CYCLE
ACCUMULATION ADDR. 0x09 = 0x0080
ENABLE LINE CYCLE ACCUMULATION
INTERRUPT ADDR. 0x0A = 0x04
READ LINE ACCUMULATION ENERGY
ADDR. 0x04
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
INTERRUPT
NO
NO
YES
YES
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
INTERRUPT
WRITE PHCAL VALUE TO THE PHCAL
REGISTER: ADDR. 0x10
-
0
For this example:
Line Frequency:
CF Numerator:
CF Denomina
f
= 50 Hz
L
CFNUM
= 0
tor:
CFDEN
= 489
I
b
= 10 A
Base Current:
Half
PERI D Register:
Expected Line Accumulation at Unity Power Factor (from Watt
Gain ection):
LAENERGY
IB
(
expected
)
= 19186
Acti Energy Reading at PF = 0.5 inductive:
LAENERGY
IB, PF = 0.5
= 9613
LINECYC
IB
= 2000
PERIOD
= 8959
Figure 76. Calibrating Phase with an Accurate Source
Meter Constant:
Line Voltage:
MeterConstant
(imp/Wh) = 3.2
V
nominal
= 220 V
Line Cycles Used at Base Current:
O
s
The error using Equation 52 is
Error
=
0021
.
2
19186
2
19186
9613
=
Phase Er
°
=
07
.
3
0021
.
ror
(°) = Arcsin
Using Equation 55, PHCAL is 11.
PHCAL
=
INT
11
13
2
0x0D
360
8959
07
.
=
+
=
+
°
×
°
Note that PHCAL is a signed, twos complement register.
The phase lead is corrected by 0.08 degrees when the PHCAL
register is set to 11:
n
(°) =
Phase Correctio
PERIOD
PHCAL
°
×
360
)
0x0D
(
Phase Correction
(°) =
°
=
°
×
08
.
8960
360
)
0x0D
11
(
VRMS and IRMS Calibration
VRMS and IRMS are calculated by squaring the input in a
digital multiplier.
)
(59)
2
cos(
)
sin(
V
2
)
sin(
V
2
)
(
t
t
v
2
×
×
ω
=
t
V
V
t
2
2
ω
=
ω
The s
filter
the rms value. An offset correction is provided to cancel noise
and offset contributions from the inpu
s value is extract
t of the output o
2
ass
s
t.
Ther
filter does not completely attenuate the signal. This noise can be
min
by synchronizing the rms register readi
zero crossing of the voltage signal. The IRQ
configured to indicate the zero crossing of the voltage sign
oise from the 2ω term because the low-pass
e is ripple n
quare of the rm
. The square roo
ed from
v
(
t
) by a low-p
f this low-pass filter give
imized
ngs with the
output can be
al.
ngs of the voltage input.
This flowchart demonstrates how VRMS and IRMS readings
are synchronized to the zero crossi
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