參數(shù)資料
型號： ADE7758
廠商： Analog Devices, Inc.
英文描述： Poly Phase Multifunction Energy Metering IC with Per Phase Information
中文描述： 多相多功能電能計量IC每相位信息
文件頁數(shù)： 47/68頁
文件大?。?/td> 1584K
代理商： ADE7758
ADE7758
Example—Offset Calibration of Phase a Using Pulse Output
For this example,
I
TEST
= 50 mA,
V
NOM
= 220 V,
V
FULLSCALE
= 500
V,
I
FULLSCALE
= 130 A,
MC
= 3200 impulses/kWh,
Power Factor
=
1,
Frequency
= 50 Hz, and
CLKIN
= 10 MHz.
Rev. A | Page 47 of 68
With I
TEST
, V
NOM
, and unity power factor, the example ADE7758
meter shows 0.009773 Hz on the APCF pulse output and
0.009773 Hz on the VARCF pulse output. This is equivalent to
0.24% for the watt measurement and 0.24% for the VAR
measurement. Using Equations 38 through 41, the values 0xFFB
and 0xFFA should be written to AWATTOS (0x39) and VAROS
(0x3C), respectively.
For AWATTOS:
0186
.
4
1
2
1
25
4
6
10
=
×
×
=
E
Q
For AVAROS:
014
.
4
1
4
2083
202
2
1
24
4
6
10
=
×
×
×
=
E
Q
(
.
–
)
5
–
1
227
0186
.
2
00975
.
0024
4
=
×
×
×
=
AWATTOS
(
.
–
)
6
–
1
227
014
.
2
00975
.
0024
4
=
×
×
×
=
AVAROS
Calibration Using Line Accumulation
Line cycle accumulation mode configures the nine energy
registers such that the amount of energy accumulated over an
integer number of half line cycles appears in the registers after
the LINECYC interrupt. The benefit of using this mode is that
the sinusoidal component of the active energy is eliminated.
Figure 80 shows a flow chart of how to calibrate the ADE7758
using the line accumulation mode. Calibration of all phases and
energies can be done simultaneously using this mode to save
time during calibration.
0
START
CAL IRMS OFFSET
CAL VRMS OFFSET
CAL WATT AND VA
GAIN ALL PHASES
@ PF = 1
CAL VAR GAIN ALL
PHASES @ PF = 0
CALIBRATE PHASE
ALL PHASES
@ PF = 0.5
CALIBRATE ALL
PHASES WATT
OFFSET @ I
MIN
AND
PF = 1
CALIBRATE ALL
PHASES VAR
OFFSETS @ I
MIN
AND PF = 0
END
Figure 80. Calibration Using Line Accumulation
Gain Calibration Using Line Accumulation
Gain calibration is used for meter-to-meter gain adjustment,
APCF or VARCF output rate calibration, and determining the
Wh/LSB, VARh/LSB, and VAh/LSB constant.
Step 0: Before performing the gain calibration, the
CFNUM/CFDEN (0x45/0x46) and VARCFNUM/VARCFDEN
(0x47/0x48) values can be set to achieve the correct
impulses/kWh, impulses/kVAh, or impulses/kVARh using the
same method outlined in Step 4 in the Gain Calibration Using
Pulse Output section. The calibration of xWG/xVARG/xVAG
(0x2A through 0x32) is done with the line accumulation mode.
Figure 81 shows the steps involved in calibrating the gain
registers using the line accumulation mode.
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