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参数资料
| 型号： | ADE7761AARSZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/24页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METERING 1PHASE 20SSOP |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 1,500 |
| 输入阻抗： | 400 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： | 带卷 (TR) |
ADE7761A
244V rms
POWER
GENERATOR
LOAD
IB
CT
CT
RA 1
RB
RB
R F
V 1A
0V
R F
V 1A
C F
V 1N
C F
V 1B
Analog Devices, Inc. cautions users of the ADE7761A about the
following:
? Billing active energy in Case 1 is consistent with the
understanding of the quantity represented by pulses on CF,
F1, and F2 outputs (watt-hour).
? Billing active energy while the ADE7761A is in Case 2 must
be decided knowing that the entity measured by the
RB 1
VR 1
C F
V 2P
ADE7761A in this case is ampere-hour and not watt-hour.
Users should be aware of this limitation and decide if the
R F
C T
V 2N
ADE7761A is appropriate for their application.
Missing Neutral Detection
1 RB
+ VR = RF.
Figure 31. Missing Neutral System Diagram
The ADE7761A continuously monitors the voltage input and
detects a missing neutral condition when the voltage input peak
The ADE7761A detects a missing neutral condition by
continuously monitoring the voltage channel input (V 2P ? V 2N ).
value is smaller than 9% of the analog full scale or when no zero
crossings are detected on this input (see Figure 33).
The FAULT pin is held high when a missing neutral condition is
detected. In this mode, the ADE7761A continues to bill the
energy based on the signal level on the current channel (see
Figure 32). The billing rate or frequency outputs can be adjusted
V2
AGND
V 2P
V 2N
ADC
FILTER AND
THRESHOLD
MISSING
NEUTRAL
by changing the dc level on the MISCAL pin.
V 1A
ADC
A>B
|V2| PEAK < 9% OF FULL SCALE
OR
NO ZERO CROSSING ON V2
V 1N
HPF
V 2P – V 2N
V 2P – V 2N
V 2P – V 2N
V 1B
ADC
B>A
B <> A
ZERO
CROSSING
DETECTION
LPF
FS
9% OF FS
0V
FS
0V
FS
0V
MISCAL
ADC
MISSING NEUTRAL
GAIN ADJUSMTENT
DIGITAL-TO-
FREQUENCY
CONVERTERS
Figure 33. Missing Neutral Detection
CF F1 F2
Figure 32. Energy Calculation in Missing Neutral Mode
Important Note for Billing of Active Energy
The ADE7761A leaves the missing neutral mode for normal
operation when both conditions are no longer valid, that is, a
voltage peak value of greater than 9% of full scale and zero
crossing on the voltage channel is detected (see Figure 34).
The ADE7761A provides pulse outputs—CF, F1, and F2—
intended to be used for the billing of active energy. Pulses
are generated at these outputs in two different situations.
V2
V 2P
ADC
FILTER AND
THRESHOLD
MISSING
NEUTRAL
Case 1 : When the analog input V 2P – V 2N complies with the
conditions described in Figure 34, CF, F1, and F2 frequencies
are proportional to active power and can be used to bill active
energy.
Case 2 : When the analog input V 2P – V 2N does not comply with
the conditions described in Figure 34, the ADE7761A does not
measure active energy but a quantity proportional to kAh. This
quantity is used to generate pulses on the same CF, F1, and F2.
AGND
V 2N
|V2| PEAK > 9% OF FULL SCALE
AND
ZERO CROSSING ON V2
V 2P – V 2N
FS
+9% OF FS
–9% OF FS
This situation is indicated when the FAULT pin is high.
Figure 34. Return to Normal Mode after Missing Neutral Detection
Rev. 0 | Page 19 of 24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADE7761ARS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADE7761ARS-REF | 制造商:Analog Devices 功能描述:ENERGY METER IC W/FAULT&MNEUT DETEC. - Bulk |
| ADE7761ARSRL | 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7761B | 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7761BARS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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