参数资料
| 型号： | EVAL-ADE7763ZEB |
| 厂商： | Analog Devices Inc |
| 文件页数： | 42/56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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Error = 2 = 0 . 0021
2
? = ? 0 . 07 °
Phase Error (°) = ?Arcsin ??
ADE7763
Calibrating Phase with an Accurate Source Example
With an accurate source, line cycle accumulation is a good
method of calibrating phase error. The value of LAENERGY
must be obtained at two power factors, PF = 1 and PF = 0.5
inductive.
SET I TEST = I b , V TEST = V NOM , PF = 0.5
SET HALF LINE CYCLES FOR ACCUMULATION
The error using Equation 52 is
9613 ? 19186
19186
? 0 . 0021 ?
?
? 3 ?
Using Equation 55, PHCAL is 11.
Data Sheet
PHCAL = INT ? ? ? 0 . 07 ° ×
? + 0x0D = ? 2 + 13 = 11
IN LINECYC REGISTER ADDR. 0x1C
SET MODE FOR LINE CYCLE
?
8959 ?
360 ° ?
ACCUMULATION ADDR. 0x09 = 0x0080
ENABLE LINE CYCLE ACCUMULATION
INTERRUPT ADDR. 0x0A = 0x04
Note that PHCAL is a signed, twos complement register.
The phase lead is corrected by 0.08 degrees when the PHCAL
register is set to 11:
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
Phase Correction (°) = ? ( PHCAL ? 0x0D ) ×
360 °
PERIOD
INTERRUPT?
NO
Phase Correction (°) = ? ( 11 ? 0x0D ) ×
VRMS and IRMS Calibration
360 °
8960
= 0 . 08 °
VRMS and IRMS are calculated by squaring the input in a
YES
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
digital multiplier.
v 2 ( t ) = 2 V sin( ω t ) × 2 V sin( ω t ) = V 2 ? V 2 × cos( 2 ω t )
(59)
INTERRUPT?
NO
The square of the rms value is extracted from v 2 ( t ) by a low-pass
filter. The square root of the output of this low-pass filter gives
the rms value. An offset correction is provided to cancel noise
YES
READ LINE ACCUMULATION ENERGY
ADDR. 0x04
CALCULATE PHCAL. SEE EQUATION 55.
WRITE PHCAL VALUE TO THE PHCAL
REGISTER: ADDR. 0x10
Figure 76. Calibrating Phase with an Accurate Source
and offset contributions from the input.
There is ripple noise from the 2ω term because the low-pass
filter does not completely attenuate the signal. This noise can be
minimized by synchronizing the rms register readings with the
zero crossing of the voltage signal. The IRQ output can be
configured to indicate the zero crossing of the voltage signal.
This flowchart demonstrates how VRMS and IRMS readings
are synchronized to the zero crossings of the voltage input.
For this example:
Meter Constant:
Line Voltage:
Line Frequency:
CF Numerator:
CF Denominator:
Base Current:
MeterConstant (imp/Wh) = 3.2
V nominal = 220 V
f L = 50 Hz
CFNUM = 0
CFDEN = 489
I b = 10 A
SET INTERRUPT ENABLE FOR ZERO
CROSSING ADDR. 0x0A = 0x0010
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
INTERRUPT?
Half Line Cycles Used at Base Current:
LINECYC IB = 2000
NO
PERIOD Register:
PERIOD = 8959
YES
Expected Line Accumulation at Unity Power Factor (from Watt
Gain section): LAENERGY IB ( expected ) = 19186
Active Energy Reading at PF = 0.5 inductive:
LAENERGY IB, PF = 0.5 = 9613
READ VRMS OR IRMS
ADDR. 0x17; 0x16
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
Figure 77. Synchronizing VRMS and IRMS Readings with Zero Crossings
Rev. C | Page 42 of 56
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