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| 型号： | ADE7762ARWZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/28页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METERING 3PHASE 28SOIC |
| 标准包装： | 27 |
| 输入阻抗： | 410 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： | 8.5mA |
| 电源电压： | 4.75 V ~ 5.25 V |
| 测量仪表类型： | 3 相 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
| 配用： | EVAL-ADE7762EBZ-ND - BOARD EVALUATION FOR ADE7762 |
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ADE7762
DIGITAL-TO-FREQUENCY CONVERSION
After multiplication, the digital output of the low-pass filter
contains the active power information of each phase. However,
because this LPF is not an ideal brick wall filter implementation,
the output signal also contains attenuated components at the line
frequency and its harmonics, that is, cos(hωt), where h = 1, 2, 3 …
The average value of a sinusoidal signal is zero. Thus, the
frequency generated by the ADE7762 is proportional to the
average active power. Figure 26 shows the digital-to-frequency
conversion for steady load conditions, that is, constant voltage
and current.
| H ( f ) | =
? f ?
1 + ? ?
The magnitude response of the filter is given by
1
2
? 8 ?
(11)
The frequency output CF varies over time, even under steady load
conditions (see Figure 26). This frequency variation is primarily
due to the cos(2ωt) components in the instantaneous active power
signal. The output frequency on CF can be up to 160× higher than
the frequency on F1 and F2. The higher output frequency is
generated by accumulating the instantaneous active power signal
where the ?3 dB cutoff frequency of the low-pass filter is 8 Hz.
For a line frequency of 50 Hz, this gives an attenuation of
the 2ω (100 Hz) component of approximately ?22 dB. The
dominating harmonic is twice the line frequency, that is,
shows the instantaneous active power signal at the output of
the CF, which still contains a significant amount of instantane-
ous power information, cos(2ωt).
This signal is then passed to the digital-to-frequency converter
where it is integrated (accumulated) over time to produce an
output frequency. This accumulation of the signal suppresses or
averages out any nondc component in the instantaneous active
power signal.
over a much shorter time, while converting it to a frequency. This
shorter accumulation period means less averaging of the cos(2ωt)
component. Therefore, some of this instantaneous power signal
passes through the digital-to-frequency conversion.
Where CF is used for calibration purposes, the frequency counter
should average the frequency to remove the ripple and obtain a
stable frequency. If CF is used to measure energy, for example, in a
microprocessor-based application, the CF output should also be
averaged to calculate power. Because the outputs F1 and F2 operate
at a much lower frequency, significant averaging of the
instantaneous active power signal is carried out. The result is a
greatly attenuated sinusoidal content and a virtually ripple-free
frequency output on F1 and F2, which are used to measure energy
in a stepper motor-based meter.
VA
LPF
ABS
MULTIPLIER
|X|
F1
IA
DIGITAL-TO-
FREQUENCY
VB
MULTIPLIER
LPF
|X|
Σ
Σ
DIGITAL-TO-
FREQUENCY
F1
F2
CF
TIME
IB
VC
MULTIPLIER
IC
LPF
|X|
Σ
V× I
2
CF
TIME
LPF TO EXTRACT
REAL POWER
(DC TERM)
cos(2 ω t)
ATTENUATED BY LPF
0
ω
2 ω
FREQUENCY – RAD/S
INSTANTANEOUS REAL POWER SIGNAL
(FREQUENCY DOMAIN)
Figure 26. Active Power-to-Frequency Conversion
Rev. 0 | Page 21 of 28
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADE7762ARWZ-RL | 功能描述:IC ENERGY METERING 3PHASE 28SOIC 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:* |
| ADE7763 | 制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Active and Apparent Energy Metering IC |
| ADE7763_13 | 制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Active and Apparent Energy Metering IC |
| ADE7763ARS | 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP 制造商:Rochester Electronics LLC 功能描述:1 PHASE ACTIVE AND APPARENT ENERGY IC - Bulk |
| ADE7763ARSRL | 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP T/R |
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