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| 型号： | ADE7753ARSZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 45/60页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METERING 1PHASE 20SSOP |
| 标准包装： | 66 |
| 输入阻抗： | 390 千欧 |
| 测量误差： | 0.1% |
| 电压 - 高输入/输出： | 2.4V |
| 电压 - 低输入/输出： | 0.8V |
| 电流 - 电源： | 3mA |
| 电源电压： | 4.75 V ~ 5.25 V |
| 测量仪表类型： | 单相 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 797 (CN2011-ZH PDF) |
| 配用： | EVAL-ADE7753ZEB-ND - BOARD EVALUATION AD7753 |
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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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADE7753ARSZ | 制造商:Analog Devices 功能描述:ENERGY METERING IC |
| ADE7753ARSZ | 制造商:Analog Devices 功能描述:IC MULTIFUNCTION METER |
| ADE7753ARSZRL | 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 能量测量 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:* |
| ADE7753-ARSZRL | 制造商:Analog Devices 功能描述: |
| ADE7753XRS | 制造商:Analog Devices 功能描述: |
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