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参数资料
| 型号： | ADE7757ARNZRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METERING 1PHASE 16SOIC |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
ADE7757
? × cos ( 60 ° )
? 2 ?
THEORY OF OPERATION
The two ADCs digitize the voltage signals from the current
and voltage sensors. These ADCs are 16-bit - with an
oversampling rate of 450 kHz. This analog input structure
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 chan-
nel 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. Because the HPF is
always enabled, the IC will operate only with ac input (see HPF
and Offset Effects section).
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. In order
to extract the real power component (i.e., the dc component),
the instantaneous power signal is low-pass filtered. Figure 3
illustrates the instantaneous real power signal and shows how
the real power information can be 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.
DIGITAL-TO-
The low frequency outputs (F1, F2) of the ADE7757 are gener-
ated 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 (e.g., 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, which can be done faster under
steady load conditions.
Power Factor Considerations
The method used to extract the real power information from the
instantaneous power signal (i.e., by low-pass filtering) is still
valid even when the voltage and current signals are not in phase.
Figure 4 displays the unity power factor condition and a DPF
(displacement power factor) = 0.5, i.e., current signal lagging the
voltage by 60 ° . If we assume the voltage and current waveforms
are sinusoidal, the real power component of the instantaneous
power signal (i.e., the dc term) is given by
? V × 1 ?
?
This is the correct real power calculation.
HPF
FREQUENCY
F1
INSTANTANEOUS
INSTANTANEOUS REAL
CH1
ADC
LPF
F2
POWER
POWER SIGNAL
POWER SIGNAL
MULTIPLIER
DIGITAL-TO-
FREQUENCY
CH2
ADC
CF
V
I
2
INSTANTANEOUS
INSTANTANEOUS REAL
POWER SIGNAL – p(t)
POWER SIGNAL
0V
TIME
CURRENT
VOLTAGE
POWER INSTANTANEOUS
POWER SIGNAL
INSTANTANEOUS REAL
POWER SIGNAL
TIME
TIME
Figure 3. Signal Processing Block Diagram
V
2
I
COS (60 )
0V
VOLTAGE
CURRENT
TIME
60
Figure 4. DC Component of Instantaneous Power
Signal Conveys Real Power Information, PF < 1
–8 –
REV. A
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相关代理商/技术参数 |
参数描述 |
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| ADE7757EB | 制造商:AD 制造商全称:Analog Devices 功能描述:Evaluation Board Documentation ADE7757 Energy Metering IC |
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| ADE7758ARW | 制造商:Analog Devices 功能描述:Energy Measurement 24-Pin SOIC W 制造商:Analog Devices 功能描述:IC ENERGY METER |
| ADE7758ARWRL | 制造商:Analog Devices 功能描述:Energy Measurement 24-Pin SOIC W T/R 制造商:Analog Devices 功能描述:IC ENERGY METER |
| ADE7758ARWZ | 功能描述:IC ENERGY METERING 3PHASE 24SOIC 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:* |
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