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参数资料
| 型号： | ADE7762ARWZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/28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
TYPICAL CONNECTION DIAGRAMS
V B ( t ) = 2 × V B × cos ? ? ω l t +
2 π ?
3 ?
?
IAP
CT
V C ( t ) = 2 × V C × cos ? ? ω l t +
4 π ?
3 ?
?
CURRENT CHANNEL CONNECTION
channel (IAN). A current transformer (CT) is the current trans-
ducer selected for this example. Notice that the common-mode
voltage for the current channel is AGND and is derived by
center-tapping the burden resistor to AGND. This provides the
complementary analog input signals for IAP and IAN. The CT
turns ratio and Burden Resistor Rb are selected to give a peak
differential voltage of ±500 mV at maximum load.
In theory, it is better to center-tap Rb; however, this requires
very careful attention to the layout and matching of the resistors
to ensure that the channels have the same resistance. A single
resistor may be more practical and is a valid design choice.
Rf
METER CONNECTIONS
In 3-phase service, two main power distribution services exist:
3-phase, 4-wire or 3-phase, 3-wire. The additional wire in the
3-phase, 4-wire arrangement is the neutral wire. The voltage
lines have a phase difference of ±120° (±2π/3 radians) between
each other (see Equation 7).
V A ( t ) = 2 × V A × cos ( ω l t )
? (7)
?
where V A , V B , and V C represent the voltage rms values of the
different phases.
IAN
+ φ B ? ?
I B ( t ) = 2 I B × cos ? ? ω l t +
Cf
Rb ±500mV
IP Rf
Cf
PHASE NEUTRAL
Figure 16. Typical Connection for Current Channels
The current inputs are represented by
I A ( t ) = 2 I A × cos ( ω l t + φ A )
2 π
? 3 ?
(8)
I C ( t ) = 2 I C × cos ? ? ω l t +
+ φ C ? ?
VOLTAGE CHANNEL CONNECTION
?
4 π
3
?
nel. The first option uses a potential transformer (PT) to pro-
vide complete isolation from the main voltage. In the second
option, the ADE7762 is biased around the neutral wire, and a
resistor divider is used to provide a voltage signal proportional
to the line voltage. Adjusting the ratio of Ra, Rb, and VR is a
convenient way of carrying out a gain calibration on the meter.
VR can be implemented using either a potentiometer or a
binary weighted series of resistors. Either configuration works,
however, the potentiometer is subject to noise over time. Two
fixed value resistors can be used in place of VR to minimize
where:
I A , I B , and I C represent the rms value of the current of each
phase.
φ A , φ B , and φ C represent the phase difference of the current and
voltage channel of each phase.
The instantaneous powers can then be calculated as follows:
P A (t) = V A (t) × I A (t)
P B (t) = V B (t) × I B (t)
P C (t) = V C (t) × I C (t)
the noise.
PT
±500mV
Rf
Cf
VAP
VN
Then,
P A ( t ) = V A × I A × cos ( φ A ) ? V A × I A × cos ( 2 ω l t + φ A )
P B ( t ) =
V B × I B × cos ( φ B ) ? V B × I B × cos ? ? 2 ω l t +
+ φ B ? ? (9)
AGND
Rf
Cf
?
4 π
3
?
P C ( t ) = V C × I C × cos ( φ C ) ? V C × I C × cos ? ? 2 ω l t +
+ φ C ? ?
PHASE NEUTRAL
Ra *
Cf
?
8 π
3
?
Rb*
VR*
±500mV
Rf
VAP
VN
As shown in Equation 9, the active power calculation per phase
is made when current and voltage inputs of one phase are
Cf
PHASE NEUTRAL
*Ra >> Rf + VR; *Rb + VR = Rf
Figure 17. Typical Connections for Voltage Channels
connected to the same channel (A, B, or C). Then the
summation of each individual active power calculation gives the
total active power information, P ( t ) = P A ( t ) + P B ( t ) + P C ( t ).
Rev. 0 | Page 15 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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