参数资料
| 型号： | EVAL-ADE7763ZEB |
| 厂商： | Analog Devices Inc |
| 文件页数： | 37/56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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? CF IB ( nominal )
CFDEN = INT ?
? ? 1
? CF IB ( expected )
(40)
?
?
CFDEN = INT ? ?
? ? 1 = ( 490 ? 1 ) = 489
DataSheet
?
?
958 ?
? 1 . 9556 ?
This value for CFDEN should be loaded into each meter before
calibration. The WGAIN register can then be used to finely
calibrate the CF output. The following sections explain how to
calibrate a meter based on ADE7763 when using a reference
meter or an accurate source.
ADE7763
For this example:
Meter Constant: MeterConstant (imp/Wh) = 3.2
CF Numerator: CFNUM = 0
CF Denominator: CFDEN = 489
%ERROR Measured at Base Current:
% ERROR CF ( IB ) = ?3.07%
One LSB change in WGAIN changes the active energy registers
and CF by 0.0244%. WGAIN is a signed, twos complement
register and can correct up to a 50% error. Assuming a ?3.07%
error, WGAIN is 126:
? ?
WGAIN = INT ? ? ?
WGAIN = INT ? ? ?
? = 126
Calibrating Watt Gain Using a Reference Meter Example
The CFDEN and CFNUM values for the design should be
written to their respective registers before beginning the
calibration steps shown in Figure 71. When using a reference
meter, the percent error in CF is measured by comparing the CF
? % ERROR CF ( IB ) ?
? 0 . 0244 % ?
? 3 . 07 % ?
? 0 . 0244 % ?
(42)
output of the ADE7763 meter with the pulse output of the
reference meter, using the same test conditions for both meters.
Equation 41 defines the percent error with respect to the pulse
outputs of both meters (using the base current, I b ):
When CF is calibrated, the AENERGY register has the same
Wh/LSB constant from meter to meter if the meter constant,
WDIV, and the CFNUM/CFDEN ratio remain the same. The
Wh/LSB ratio for this meter is 6.378 × 10 ?4 using Equation 35
× WDIV
( CFDEN + 1 )
LSB
% ERROR CF ( IB ) =
CF IB ? CF ref ( IB )
CF ref ( IB )
× 100
(41)
with WDIV at the default value.
( CFNUM + 1)
Wh =
MeterConst ant (imp/Wh)
CALCULATE CFDEN VALUE FOR DESIGN
1
LSB = 3 . 200 imp/Wh = 490 × 3 . 2 = 6 . 378 × 10
WRITE CFDEN VALUE TO CFDEN REGISTER
ADDR. 0x15 = CFDEN
Wh
( 490 + 1 ) 1
? 4
SET I TEST = I b , V TEST = V NOM , PF = 1
MEASURE THE % ERROR BETWEEN
THE CF OUTPUT AND THE
REFERENCE METER OUTPUT
CALCULATE WGAIN. SEE EQUATION 42.
WRITE WGAIN VALUE TO THE WGAIN
REGISTER: ADDR. 0x12
Figure 71. Calibrating Watt Gain Using a Reference Meter
Calibrating Watt Gain Using an Accurate Source Example
The CFDEN value calculated using Equation 40 should be
written to the CFDEN register before beginning calibration and
zero should be written to the CFNUM register. Enable the line
accumulation mode and the line accumulation interrupt. Then,
write the number of half line cycles for the energy accumulation
to the LINECYC register to set the accumulation time. Reset the
interrupt status register and wait for the line cycle accumulation
interrupt. The first line cycle accumulation results might not
use the accumulation time set by the LINECYC register and,
therefore, should be discarded. After resetting the interrupt
status register, the following line cycle readings will be valid.
When LINECYC half line cycles have elapsed, the IRQ pin goes
active low and the nominal LAENERGY with the test current
applied can be read. This LAENERGY value is compared to the
expected LAENERGY value to determine the WGAIN value. If
apparent energy gain calibration is performed at the same time,
LVAENERGY can be read directly after LAENERGY. Both
registers should be read before the next interrupt is issued on
the IRQ pin. Figure 72 details steps to calibrate the watt gain
using an accurate source.
Rev. C | Page 37 of 56
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