参数资料
| 型号： | EVAL-ADE7763ZEB |
| 厂商： | Analog Devices Inc |
| 文件页数： | 40/56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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ADE7763
Calibrating Watt Offset with an Accurate Source Example
accurate source.
SET I TEST = I MIN , V TEST = V NOM , PF = 1
Data Sheet
Number of Half Line Cycles used at Minimum Current:
LINECYC ( IMIN ) = 35700
Active Energy Reading at Minimum Current:
LAENERGY IMIN ( nominal ) = 1395
The LAENERGY expected at I MIN is 1255 using Equation 49.
INT ? ? MIN × LAENERGY IB ( expected ) ×
? (49)
?
SET HALF LINE CYCLES FOR ACCUMULATION
IN LINECYC REGISTER ADDR. 0x1C
SET MODE FOR LINE CYCLE
ACCUMULATION ADDR. 0x09 = 0x0080
LAENERGY IMIN ( expected ) =
? I
? I B
LAENERGY IMIN ( expected ) =
LINECYCI MIN
LINECYC IB
?
?
INT ? ?
? = INT ( 1369 . 80 ) = 1370
ENABLE LINE CYCLE ACCUMULATION
INTERRUPT ADDR. 0x0A = 0x04
0 . 04
? 10
× 19186 ×
35700 ?
2000 ?
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
where:
LAENERGY IB ( expected ) is the expected LAENERGY reading at I b
from the watt gain calibration.
LINECYC IMIN is the number of half line cycles that energy is
INTERRUPT?
NO
accumulated over when measuring at I MIN .
More line cycles could be required at the minimum current to
YES
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
minimize the effect of quantization error on the offset calibration.
For example, if a test current of 40 mA results in an active energy
accumulation of 113 after 2000 half line cycles, one LSB variation
in this reading represents a 0.8% error. This measurement does
not provide enough resolution to calibrate a <1% offset error.
INTERRUPT?
NO
However, if the active energy is accumulated over 37,500 half
line cycles, one LSB variation results in 0.05% error, reducing the
quantization error.
YES
READ LINE ACCUMULATION ENERGY
APOS is ?672 using Equations 55 and 49.
LAENERGY Absolute Error CLKIN
25 3 . 579545 × 10 6
0 . 069948771 × 2 35
3 . 579545 × 10 6
ADDR. 0x04
CALCULATE APOS. SEE EQUATION 45.
WRITE APOS VALUE TO THE APOS
REGISTER: ADDR. 0x11
Figure 74. Calibrating Watt Offset with an Accurate Source
For this example:
Meter Constant: MeterConstant (imp/Wh) = 3.2
Line Voltage: V nominal = 220 V
Line Frequency: f l = 50 Hz
CF Numerator: CFNUM = 0
CF Denominator: CFDEN = 489
Base Current: I b = 10 A
Half Line Cycles Used at Base Current:
LINECYC ( IB ) = 2000
Period Register Reading: PERIOD = 8959
CLKIN = 3.579545 MHz
Clock Frequency:
Expected LAENERGY Register Value at Base Current
(from the Watt Gain section):
LAENERGY IB ( expected ) = 19186
Minimum Current: I MIN = 40 mA
Rev. C | Page 40 of 56
LAENERGY Absolute Error =
LAENERGY IMIN ( nominal ) ? LAENERGY IMIN ( expected )
LAENERGY Absolute Error = 1395 ? 1370 = 25
AENERGY Error Rate (LSB/s) =
×
LINECYC / 2 8 × PERIOD
AENERGY Error Rate (LSB/s) =
× = 0 . 069948771
35700 / 2 8 × 8959
AENERGY Error Rate × 2 35
APOS = ?
CLKIN
APOS = ? = ? 672
(50)
(51)
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