- 您现在的位置：买卖IC网 > PDF目录20640 > AD71056ARZ (Analog Devices Inc)IC ENERGY METERING 1PHASE 16SOIC PDF资料下载
参数资料
| 型号： | AD71056ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METERING 1PHASE 16SOIC |
| 标准包装： | 48 |
| 输入阻抗： | 320 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： | 5mA |
| 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： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 797 (CN2011-ZH PDF) |
AD71056
THEORY OF OPERATION
The two ADCs in the AD71056 digitize the voltage signals from
the current and voltage sensors. These ADCs are 16-bit, Σ-Δ
with an oversampling rate of 450 kHz. This analog input struc-
ture greatly simplifies sensor interfacing by providing a wide
dynamic range for direct connection to the sensor and also
simplifies the antialiasing filter design. A high-pass filter in the
current channel removes any dc component from the current
signal. This eliminates any inaccuracies in the real power
calculation due to offsets in the voltage or current signals.
POWER FACTOR CONSIDERATIONS
The method used to extract the real power information from
the instantaneous power signal (that is, by low-pass filtering) is
valid even when the voltage and current signals are not in
phase. Figure 16 displays the unity power factor condition and
a displacement power factor (DPF) = 0.5; that is, the current
signal lagging the voltage by 60°. Assuming the voltage and
current waveforms are sinusoidal, the real power component of
the instantaneous power signal (the dc term) is given by
? × cos ( 60 ° )
? V × I ?
The real power calculation is derived from the instantaneous
power signal. The instantaneous power signal is generated by
a direct multiplication of the current and voltage signals. To
extract the real power component (that is, the dc component),
the instantaneous power signal is low-pass filtered. Figure 15
?
? 2 ?
This is the correct real power calculation.
(1)
illustrates the instantaneous real power signal and shows how
the real power information is extracted by low-pass filtering the
instantaneous power signal. This scheme correctly calculates
real power for sinusoidal current and voltage waveforms at all
power factors. All signal processing is carried out in the digital
domain for superior stability over temperature and time.
INSTANTANEOUS
POWER SIGNAL
POWER
V×I
2
0V
INSTANTANEOUS REAL
POWER SIGNAL
TIME
CH1
ADC
HPF
MULTIPLIER
LPF
DIGITAL-TO-
FREQUENCY
F1
F2
DIGITAL-TO-
FREQUENCY
CURRENT
AND
VOLTAGE
POWER INSTANTANEOUS
POWER SIGNAL
INSTANTANEOUS REAL
POWER SIGNAL
CH2
ADC
CF
V×I
2
COS (60°)
INSTANTANEOUS
POWER SIGNAL – p(t)
INSTANTANEOUS REAL
POWER SIGNAL
0V
VOLTAGE
CURRENT
TIME
60°
Figure 16. DC Component of Instantaneous Power Signal Conveys
Real Power Information, PF < 1
TIME
TIME
Figure 15. Signal Processing Block Diagram
The low frequency outputs (F1, F2) of the AD71056 are
generated by accumulating this real power information. This
low frequency inherently means a long accumulation time
between output pulses. Consequently, the resulting output
frequency is proportional to the average real power. This
average real power information is then accumulated (for
NONSINUSOIDAL VOLTAGE AND CURRENT
The real power calculation method also holds true for non-
sinusoidal current and voltage waveforms. All voltage and
current waveforms in practical applications have some
harmonic content. Using the Fourier transform, instantaneous
voltage and current waveforms can be expressed in terms of
their harmonic content.
v ( t ) = V 0 + 2 × ∑ V h × sin ( h ω t + α h )
example, by a counter) to generate real energy information.
Conversely, due to its high output frequency and, hence, shorter
integration time, the CF output frequency is proportional to the
instantaneous real power. This is useful for system calibration
that can be done faster under steady load conditions.
∞
h ≠ 0
where:
v(t) is the instantaneous voltage.
(2)
V 0 is the average value.
V h is the rms value of Voltage Harmonic h.
α h i s the phase angle of the voltage harmonic.
Rev. A | Page 10 of 20
相关PDF资料 |
PDF描述 |
|---|---|
| ADE7768ARZ | IC ENERGY METERING 1PHASE 16SOIC |
| AMM25DSXH | CONN EDGECARD 50POS DIP .156 SLD |
| LQW18AN6N8D00D | INDUCTOR 6.8NH 750MA 0603 |
| RS2AA-13 | RECT FAST RECOVERY 50V 1.5A SMA |
| ABB66DHHT-S578 | EDGECARD 132POS .050 SLD W/POSTS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD71056ARZ | 制造商:Analog Devices 功能描述:IC ENERGY METERING IC 7KHZ SOIC-16 制造商:Analog Devices 功能描述:IC, ENERGY METERING IC, 7KHZ, SOIC-16 |
| AD71056ARZ-RL | 功能描述:IC ENERGY METERING 1PHASE 16SOIC 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:* |
| AD71057ARS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD71057ARSRL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD71057ARSZ | 制造商:Analog Devices 功能描述: |
发布紧急采购，3分钟左右您将得到回复。