参数资料
| 型号： | EVAL-ADE7763ZEB |
| 厂商： | Analog Devices Inc |
| 文件页数： | 39/56页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADE7763 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 已用 IC / 零件： | ADE7763 |
| 已供物品： | 板 |
| 相关产品： | ADE7763ARSZRLDKR-ND - IC ENERGY METERING 1PHASE 20SSOP ADE7763ARSZRLCT-ND - IC ENERGY METERING 1PHASE 20SSOP ADE7763ARSZ-ND - IC ENERGY METERING 1PHASE 20SSOP ADE7763ARSZRLTR-ND - IC ENERGY METERING 1PHASE 20SSOP |
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Data Sheet
ADE7763
WGAIN = INT ? ? ?
? 1 ? ? × 2 12 ? = 480
? 19186
? ? 17174
? ?
?
Figure 73. Calibrating Watt Offset Using a Reference Meter
For this example:
Note that WGAIN is a signed, twos complement register.
With WDIV and CFNUM set to 0, LAENERGY can be
expressed as
LAENERGY IB ( expected ) =
INT ( CF IB ( expected ) × LINECYC IB / 2 × PERIOD × 8 / CLKIN × ( CFDEN + 1 ))
Meter Constant:
Minimum Current:
Load at Minimum Current:
CF Error at Minimum Current:
CF Numerator:
CF Denominator:
Clock Frequency:
MeterConstant (imp/Wh) = 3.2
I MIN = 40 mA
W IMIN = 9.6 W
% ERROR CF ( IMIN ) = 1.3%
CFNUM = 0
C DEN = 489
C KIN = 3.579545 MHz
The calculated Wh/LSB ratio for the active energy register,
Using Equation 45, APOS is ?522 for this example.
using Equation 35 is 6.378 × 10 ?4 is
CF Absolute Error = CF IMIN ( nominal ) ? CF IMIN ( expected )
(46)
LSB = 3 . 200 imp/Wh = 6 . 378 × 10
Wh
1
( 489 + 1 )
? 4
CF Absolute Error =
(% ERROR CF ( IMIN ) ) × W IMIN ×
MeterConstant (imp/Wh)
3600
(47)
? 1 . 3 % ? × 9 . 6 × 3 . 200 = 0 . 000110933 Hz
Watt Offset
Offset calibration allows outstanding performance over a wide
dynamic range, for example, 1000:1. To do this calibration two
measurements are needed at unity power factor, one at I b and
CF Absolute Error =
? 100 ? 3600
CFNUM + 1
the other at the lowest current to be corrected. Either calibra-
tion frequency or line cycle accumulation measurements can be
used to determine the energy offset. Gain calibration should be
performed prior to offset calibration.
Offset calibration is performed by determining the active energy
Then,
AENERGY Error Rate (LSB/s) =
CFDEN + 1
CF Absolute Error ×
(48)
= 0 . 05436
490
0 . 05436 × 2 35
3 . 579545 × 10 6
× ( CFDEN + 1 ) × 2 35
(% ERROR CF ( IMIN ) ) × W IMIN ×
error rate. After determining the active energy error rate, calcu-
late the value to write to the APOS register to correct the offset.
AENERGY Error Rate × 2 35
APOS = ? (45)
CLKIN
The AENERGY registers update at a rate of CLKIN/4. The twos
complement APOS register provides a fine adjustment to the
active power calculation. It represents a fixed amount of power
offset to be adjusted every CLKIN/4. The 8 LSBs of the APOS
register are fractional such that one LSB of APOS represents
1/256 of the least significant bit of the internal active energy
register. Therefore, one LSB of the APOS register represents 2 ?33
of the AENERGY[23:0] active energy register.
See the following sections for steps to determine the active
energy error rate for both line accumulation and reference
AENERGY Error Rate (LSB/s) =
0.000110933 ×
1
Using Equation 45, APOS is ?522.
APOS = ? = ? 522
APOS can be represented as follows with CFNUM and WDIV
set at 0:
APOS =
MeterConst ant (imp/Wh)
? 3600
CLKIN
meter calibration options.
Calibrating Watt Offset Using a Reference Meter Example
with a reference meter.
SET I TEST = I MIN , V TEST = V NOM , PF = 1
MEASURE THE % ERROR BETWEEN THE
CF OUTPUT AND THE REFERENCE METER
OUTPUT, AND THE LOAD IN WATTS
CALCULATE APOS. SEE EQUATION 45.
WRITE APOS VALUE TO THE APOS
REGISTER: ADDR. 0x11
Rev. C | Page 39 of 56
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