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參數(shù)資料
| 型號(hào)： | ADE7761A |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| 中文描述： | 電能計(jì)量IC片故障檢測和失蹤中性 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大小： | 367K |
| 代理商： | ADE7761A |
ADE7761A
The differential voltage MISCAL V
2N
must be referenced
to a common mode (usually AGND). The analog inputs of the
ADE7761A can be driven with common-mode voltages of up
to 100 mV with respect to AGND. However, best results are
achieved using a common mode equal to AGND.
Rev. 0 | Page 12 of 24
Typical Connection Diagrams
Figure 15 shows a typical connection diagram for Channel V1.
The analog inputs are used to monitor both the phase and
neutral currents. Because of the large potential difference
between the phase and neutral, two current transformers (CTs)
must be used to provide the isolation. Note that both CTs are
referenced to analog ground (AGND); therefore, the common-
mode voltage is 0 V. The CT turns ratio and burden resistor
(RB) are selected to give a peak differential voltage of
±660 mV/gain.
AGND
V
1B
V
1N
V
1A
R
F
R
F
C
F
C
F
CT
CT
RB
RB
IN
IP
P
N
0
±660mV
GAIN
±660mV
GAIN
Figure 15. Typical Connection for Channel 1
Figure 16 shows two typical connections for Channel V2.
The first option uses a potential transformer (PT) to provide
complete isolation from the main voltage. In the second option,
the ADE7761A is biased around the neutral wire, and a resistor
divider is used to provide a voltage signal that is proportional to
the line voltage. Adjusting the ratio of RA and RB + VR is a
convenient way to carry out a gain calibration on the meter.
0
1
RB + VR = RF.
VR
1
RB
1
RA
1
V
2P
N
P
R
F
V
2N
C
T
V
2P
N
P
R
F
R
F
V
2N
C
F
C
F
C
F
±660mV
AGND
Figure 16. Typical Connection for Channel 2
Figure 17 shows a typical connection for the MISCAL input.
The voltage reference input (REF
IN/OUT
) is used as a dc reference
to set the MISCAL voltage.
Adjusting the level of MISCAL to calibrate the meter in missing
neutral mode can be done by changing the ratio of RC and RD
+ VR1. When the internal reference is used, the values of RC,
RD, and VR1 must be chosen to limit the current sourced by
the internal reference sourcing current to below the specified
20 μA. Therefore, because V
REF
internal = 2.5 V, RC + RD +
VR1 > 600 kΩ.
0
VR1
RD
RC
MISCAL
R
F
V
2N
C
F
C
F
REF
IN/OUT
Figure 17. Typical Connection for MISCAL
INTERNAL OSCILLATOR
The nominal internal oscillator frequency is 450 kHz when
used with the recommended R
OSC
resistor value of 6.2 kΩ
between RCLKIN and DGND (see Figure 18).
The internal oscillator frequency is inversely proportional to the
value of this resistor. Although the internal oscillator operates
when used with an R
OSC
resistor value between 5 kΩ and 12 kΩ,
it is recommended to choose a value within the range of the
nominal value.
The output frequencies on CF, F1, and F2 are directly propor-
tional to the internal oscillator frequency; therefore, the resistor
R
OSC
must have a low tolerance and low temperature drift. A low
tolerance resistor limits the variation of the internal oscillator
frequency. A small variation of the clock frequency and
consequently of the output frequencies from meter to meter
contributes to a smaller calibration range of the meter.
A low temperature drift resistor directly limits the variation of
the internal clock frequency over temperature. The stability of
the meter to external variation is then better ensured by design.
2.5V
REFERENCE
INTERNAL
OSCILLATOR
9
ADE7761A
DGND
RCLKIN
REF
IN/OUT
3k
0
R
OSC
14
17
Figure 18. Internal Oscillator Connection
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ADE7761AARS | 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP 制造商:Rochester Electronics LLC 功能描述: |
| ADE7761AARS-REF | 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC with On-Chip Fault and Missing Neutral Detection |
| ADE7761AARS-RL | 制造商:Analog Devices 功能描述:Energy Measurement 20-Pin SSOP T/R |
| ADE7761AARSZ | 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測量 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:* |
| ADE7761AARSZ-RL | 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 能量測量 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:* |
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