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參數(shù)資料
| 型號： | ADE7760 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 8-Channel 14-Bit Single-Supply Voltage-Output DAC; Package: LQFP (10x10mm); No of Pins: 52; Temperature Range: Industrial |
| 中文描述： | 電能計量IC片故障檢測 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 514K |
| 代理商： | ADE7760 |
ADE7760
OPERATION
POWER SUPPLY MONITOR
The ADE7760 contains an on-chip power supply monitor. The
power supply (V
DD
) is continuously monitored by the ADE7760.
If the supply is less than 4 V ± 5%, the ADE7760 goes into an
inactive state, that is, no energy is accumulated and the CF, F1,
and F2 outputs is disabled. This is useful to ensure correct
device operation at power-up and during power-down. The
power supply monitor has built-in hysteresis and filtering. This
gives a high degree of immunity to false triggering due to noisy
supplies.
Rev. 0 | Page 11 of 24
The power supply and decoupling for the part should be such
that the ripple at V
DD
does not exceed 5 V ± 5% as specified for
normal operation.
REVP - FAULT - CF -
F1 - F2 OUTPUTS
INACTIVE
ACTIVE
TIME
INACTIVE
V
DD
5V
4V
0V
0
Figure 8. On-Chip Power Supply Monitoring
ANALOG INPUTS
Channel V1 (Current Channel)
The voltage outputs from the current transducers are connected
to the ADE7760 here. Channel V1 has two voltage inputs, V
1A
and V
1B
. These inputs are fully differential with respect to V
1N
.
However, at any one time, only one is selected to perform the
power calculation (see the Fault Detection section).
The maximum peak differential signal on V
1A
–V
1N
and V
1B
–V
1N
is ±660 mV. Figure 9 shows the maximum signal levels on V
1A
,
V
1B
, and V
1N
. The differential voltage signal on the inputs must
be referenced to a common mode such as AGND.
V
CM
+660mV + V
CM
–660mV + V
CM
DIFFERENTIAL INPUT B
±660mV MAX PEAK
V
1B
V
1N
V
1A
V1
V1
V
CM
COMMON MODE
±100mV MAX
DIFFERENTIAL INPUT A
±660mV MAX PEAK
AGND
V
1A
, V
1B
0
Figure 9. Maximum Signal Levels, Channel 1
Channel V2 (Voltage Channel)
The output of the line voltage transducer is connected to the
ADE7760 at this analog input. Channel V2 is a single-ended
voltage input. The maximum peak differential signal on
Channel 2 is ±660 mV with respect to V
2N
. Figure 10 shows the
maximum signal levels that can be connected to Channel 2.
0
V
CM
+660mV + V
CM
–660mV + V
CM
COMMON MODE
±100mV MAX
V
2N
V
2P
V
CM
V2
DIFFERENTIAL INPUT
±660mV MAX PEAK
V2
Figure 10. Maximum Signal Levels, Channel 2
The differential voltage V
2P
–V
2N
must be referenced to a
common mode (usually AGND). The analog inputs of the
ADE7760 can be driven with common-mode voltages of up to
100 mV with respect to AGND. However, the best results are
achieved using a common mode equal to AGND.
Typical Connection Diagrams
Figure 11 shows a typical connection diagram for Channel V1.
The analog inputs are being 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 AGND (analog ground); the common-mode
voltage is, therefore, 0 V. The CT turns ratio and burden resistor
(RB) are selected to give a peak differential voltage of ±660 mV.
AGND
V
1B
V
1N
V
1A
R
F
R
F
C
F
C
F
CT
CT
RB
RB
IN
IP
P
N
0
Figure 11. Typical Connection for Channel 1
Figure 12 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 ADE7760 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 of carrying out a gain calibration on the meter.
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