參數(shù)資料
型號： ADE7753ARSZRL
廠商： ANALOG DEVICES INC
元件分類： 模擬信號調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO20
封裝： ROHS COMPLIANT, MO-150AE, SSOP-20
文件頁數(shù)： 40/60頁
文件大?。?/td> 938K
代理商： ADE7753ARSZRL
ADE7753
Rev. C | Page 45 of 60
Calibrating Phase with an Accurate Source Example
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.
SET HALF LINE CYCLES FOR ACCUMULATION
IN LINECYC REGISTER ADDR. 0x1C
SET ITEST = Ib, VTEST = VNOM, PF = 0.5
CALCULATE PHCAL. SEE EQUATION 59.
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
YES
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
INTERRUPT?
WRITE PHCAL VALUE TO THE PHCAL
REGISTER: ADDR. 0x10
02875-A-011
Figure 85. Calibrating Phase with an Accurate Source
For this example:
Meter Constant:
MeterConstant(imp/Wh)
= 3.2
Line Voltage:
Vnominal = 220 V
Line Frequency:
fl = 50 Hz
CF Numerator:
CFNUM = 0
CF Denominator:
CFDEN = 489
Base Current:
Ib = 10 A
Half Line Cycles Used at Base Current:
LINECYCIB = 2000
PERIOD Register:
PERIOD = 8959
Expected Line Accumulation at Unity Power Factor (from Watt
Gain Section:
LAENERGYIB(expected) =
19186
Active Energy Reading at PF = .5 inductive:
LAENERGYIB, PF
= .5
= 9613
The error using Equation 56 is
Error =
0021
.
0
2
19186
2
19186
9613
=
Phase Error (°) = Arcsin
°
=
07
.
0
3
0021
.
0
Using Equation 59, PHCAL is calculated to be 11.
PHCAL = INT
11
13
2
0x0D
360
8959
07
.
0
=
+
=
+
°
×
°
Note that PHCAL is a signed twos complement register.
The phase lead is corrected by 0.08° when the PHCAL register
is set to 11:
Phase Correction (°) =
PERIOD
PHCAL
°
×
360
)
0x0D
(
Phase Correction (°) =
°
=
°
×
08
.
0
8960
360
)
0x0D
11
(
VRMS and IRMS Calibration
VRMS and IRMS are calculated by squaring the input in a
digital multiplier.
)
2
cos(
)
sin(
V
2
)
sin(
V
2
)
(
t
V
t
v
2
ω
×
=
ω
×
ω
=
(63)
The square of the rms value is extracted from v2(t) by a low-pass
filter. The square root of the output of this low-pass filter gives
the rms value. An offset correction is provided to cancel noise
and offset contributions from the input.
There is ripple noise from the 2ω term because the low-pass
filter does not completely attenuate the signal. This noise can be
minimized by synchronizing the rms register readings with the
zero crossing of the voltage signal. The IRQ output can be
configured to indicate the zero crossing of the voltage signal.
This flowchart demonstrates how VRMS and IRMS readings
are synchronized to the zero crossings of the voltage input.
SET INTERRUPT ENABLE FOR ZERO
CROSSING ADDR. 0x0A = 0x0010
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
INTERRUPT?
NO
YES
02875-A-003
READ VRMS OR IRMS
ADDR. 0x17; 0x16
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
Figure 86. Synchronizing VRMS and IRMS Readings with Zero Crossings
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