參數(shù)資料
型號(hào)： ADE7758ARW
廠商： ANALOG DEVICES INC
元件分類： 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： MS-013-AD, SOIC-24
文件頁(yè)數(shù)： 50/68頁(yè)
文件大?。?/td> 1584K
代理商： ADE7758ARW
ADE7758
Figure 82 shows the steps involved in calibrating the phase
using the line accumulation mode.
Rev. A | Page 50 of 68
Step 6: Calculate xPHCAL and write to the xPHCAL registers
(0x3F to 0x41).
0
STEP 1
SET LCYCMODE,
LINECYC AND MASK
REGISTERS
STEP 2
SET UP SYSTEM FOR
I
TEST
, V
NOM
, PF = 0.5
STEP 3
RESET STATUS
REGISTER
STEP 4
READ ALL XWATTHR
REGISTERS AFTER
LENERGY
INTERRUPT
STEP 5
CALCULATE PHASE
ERROR IN DEGREES
FOR ALL PHASES
STEP 6
CALCULATE AND
WRITE TO ALL
XPHCAL REGISTERS
( )
( )
°
×
°
×
μ
=
Error
Phase
Period
s
xPHCAL
1
360
4
–
(51)
The period is available in the ADE7758 frequency register if it is
not known. Equation 37 shows how to determine the value
written to xPHCAL using the period register measurement (see
the Phase Calibration Using Pulse Output section). In Equation
37, the 2.4 μs is for phase errors that are negative. For positive
phase error, the 2.4 μs is replaced by 4.8 μs (see the Phase
Compensation section).
Example—Phase Calibration Using Line Accumulation
This example shows only Phase A phase calibration. All three
PHCAL registers can be calibrated simultaneously using the
same method.
For this example,
I
TEST
= 10 A,
V
NOM
= 220 V,
Power Factor
= 0.5
inductive, and
Frequency
= 50 Hz.
Figure 82. Phase Calibration Using Line Accumulation
With
I
TEST
,
V
NOM
, and 0.5 inductive power factor, the example
ADE7758 meter shows 12036d in the AWATTHR (0x01)
register. For unity power factor (after gain calibration), the
meter shows 24020d in the AWATTHR register. This is
equivalent to 26 LSBs of error.
Step 1: If the values were changed after gain calibration, Step 1,
Step 3, and Step 4 from the gain calibration should be repeated
to configure the LCYCMODE and LINECYC registers.
Step 2: Set the test system for I
TEST
, V
NOM
, and 0.5 power factor.
The
Phase Error
in degrees using Equation 50 is 0.07°.
Step 3: Reset the interrupt status register by reading RSTATUS
(0x1A).
( )
°
°
=
=
07
.
–
3
00215
.
sin
–
Arc
Error
Phase
Step 4: The xWATTHR registers should be read after the
LINECYC interrupt. Measure the percent error in the energy
register readings (AWATTHR, BWATTHR, and CWATTHR)
compared to the energy register readings at unity power factor
(after gain calibration) using Equation 49. The readings at unity
power factor should have been repeated after the gain
calibration and stored for use in the phase calibration routine.
Using Equation 37, the value written to APHCAL (0x3F), if at
50 Hz the FREQ (0x10) register = 2083d, is 21d.
21
07
.
s
6
×
2083
°
1
360
s
4
=
μ
×
°
×
μ
=
APHCAL
2
2
–
1
1
5
=
=
=
=
PF
PF
PF
xWATTHR
xWATTHR
xWATTHR
Error
(49)
Power Offset Calibration Using Line Accumulation
Power offset calibration should be used for outstanding
performance over a wide dynamic range (1,000:1). Calibration
of the power offset is done at or close to the minimum current.
The ADE7758 has power offset registers for watts and VAR,
xWATTOS (0x39 to 0x3B) and xVAROS (0x3C to 0x3E).
Offsets in the VA measurement are compensated by adjusting
the rms offset registers (see the Calibration of IRMS and VRMS
Offset section). Figure 83 shows the steps to calibrate the power
offsets using the line accumulation mode.
Step 5: Calculate the
Phase Error
in degrees using the following
equation.
( )
°
=
3
–
Error
Arcsin
Error
Phase
(50)
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