参数资料
| 型号： | EVAL-ADE7753ZEB |
| 厂商： | Analog Devices Inc |
| 文件页数： | 45/60页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION AD7753 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADE7753 |
| 主要属性： | 电能表 |
| 次要属性： | 并行接口 |
| 已供物品： | 板，线缆，软件 |
| 产品目录页面： | 797 (CN2011-ZH PDF) |
| 相关产品： | ADE7753ARSZRL-ND - IC ENERGY METERING 1PHASE 20SSOP ADE7753ARSZ-ND - IC ENERGY METERING 1PHASE 20SSOP |
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ADE7753
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
= .5 = 9613
The error using Equation 56 is
LAENERGY IB, PF
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
Error =
9613 ? 19186
19186
2
2 = 0 . 0021
? = ? 0 . 07 °
Phase Error (°) = ?Arcsin ? ?
SET HALF LINE CYCLES FOR ACCUMULATION
IN LINECYC REGISTER ADDR. 0x1C
? 0. 0021 ?
?
? 3 ?
Using Equation 59, PHCAL is calculated to be 11.
PHCAL = INT ? ? ? 0 . 07 ° ×
? + 0x0D = ? 2 + 13 = 11
SET MODE FOR LINE CYCLE
ACCUMULATION ADDR. 0x09 = 0x0080
?
8959 ?
360 ° ?
ENABLE LINE CYCLE ACCUMULATION
INTERRUPT ADDR. 0x0A = 0x04
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
Note that PHCAL is a signed twos complement register.
The phase lead is corrected by 0.08° when the PHCAL register
is set to 11:
Phase Correction (°) = ? ( PHCAL ? 0x0D ) ×
360 °
PERIOD
INTERRUPT?
NO
Phase Correction (°) = ? ( 11 ? 0x0D ) ×
360 °
8960
= 0 . 08 °
YES
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
VRMS and IRMS Calibration
VRMS and IRMS are calculated by squaring the input in a
digital multiplier.
v 2 ( t ) = 2 V sin( ω t ) × 2 V sin( ω t ) = V 2 ? V 2 × cos( 2 ω t ) (63)
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
YES
READ LINE ACCUMULATION ENERGY
ADDR. 0x04
CALCULATE PHCAL. SEE EQUATION 59.
WRITE PHCAL VALUE TO THE PHCAL
REGISTER: ADDR. 0x10
02875-A-011
Figure 85. Calibrating Phase with an Accurate Source
For this example:
the rms value. An offset correction is provided to cancel noise
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.
SET INTERRUPT ENABLE FOR ZERO
Meter Constant:
= 3.2
Line Voltage:
Line Frequency:
CF Numerator:
CF Denominator:
Base Current:
MeterConstant (imp/Wh)
V nominal = 220 V
f l = 50 Hz
CFNUM = 0
CFDEN = 489
I b = 10 A
CROSSING ADDR. 0x0A = 0x0010
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
INTERRUPT?
Half Line Cycles Used at Base Current:
LINECYC IB = 2000
YES
READ VRMS OR IRMS
NO
PERIOD Register:
PERIOD = 8959
ADDR. 0x17; 0x16
Expected Line Accumulation at Unity Power Factor (from Watt
Gain Section:
LAENERGY IB ( expected ) =
RESET THE INTERRUPT STATUS
READ REGISTER ADDR. 0x0C
19186
Active Energy Reading at PF = .5 inductive:
02875-A-003
Figure 86. Synchronizing VRMS and IRMS Readings with Zero Crossings
Rev. C | Page 45 of 60
相关PDF资料 |
PDF描述 |
|---|---|
| EVAL-ADE7754EBZ | BOARD EVALAUTION FOR ADE7754 |
| EVAL-ADE7755ZEB | BOARD EVALUATION FOR AD7755 |
| EVAL-ADE7758ZEB | BOARD EVAL FOR AD7758 |
| EVAL-ADE7759EBZ | BOARD EVALUATION FOR ADE7759 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-ADE7754EB | 制造商:Analog Devices 功能描述:EVALUATION BOARD FOR POWER METERING, POLYPHASE MULTIFUNCTION ENERGY METERING IC WITH SERIAL PORT 制造商:Analog Devices 功能描述:PWR METERING, POLYPHASE MULTIFUNCTION ENERGY METERING IC W/ - Bulk |
| EVAL-ADE7754EBZ | 功能描述:BOARD EVALAUTION FOR ADE7754 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
| EVAL-ADE7755EB | 制造商:Analog Devices 功能描述:EVAL BOARD ENERGY METERINGW/PULSE OUTPUT - Bulk |
| EVAL-ADE7755EBZ | 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with Pulse Output |
| EVAL-ADE7755EBZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with Pulse Output |
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