ADE7757EB 데이터 시트보기 (PDF) - Analog Devices
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ADE7757EB Datasheet PDF : 11 Pages
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PRELIMINARY TECHNICAL DATA
EVAL-ADE7757EB
JP5
OUTPUT FREQUENCY SELECTION
SK2A
50Hz
220V
R19
R20
JP6
C18
JP7
JP18
R21
R15
A
JP17
B
R22
P
N
JP16
TP4
V2P
V2N
TP5
P
ADE7757 provides up to four different output frequencies
on F1 and F2. The output frequency selection is made via
the logic inputs S0 and S1—see ADE7757 datasheet. On
the evaluation board these inputs are set by using jumpers
JP12 and JP13. The logic input SCF is set via jumper 11
(JP11). For a full explanation of the ADE7757 output
frequency selection see the datasheet.
SK2B
R18
N
JP8
C19 JP9
INTERNAL CLOCK
The ADE7757’s integrated oscillator serves as the clock
source to the chip. A precise 6.2 kΩ resistor with low
50Hz
SK1A
SK1B
AGND
JP1
R16
TP1 V1N
tolerance and low drift is used to drive the internal oscilla-
tor.
30mV
JP2
C16
JP3
SK1C
R17
TP2 V1P
JP4
C17
5.000V
SK3A
SK3B
5.000V
Figure 4. Typical Connection for Analog Inputs
LOGIC OUTPUTS
ADE7757 provides the active power information in the
form of an output frequency. The three frequency outputs
are F1, F2 and CF. Consult the datasheet for more infor-
mation on these outputs. The logic outputs F1 and F2 are
intended to be used to drive an impulse counter or stepper
motor. The outputs are buffered and available at the con-
nector SK6. A stepper motor may be directly connected
here. The power supply for the buffer is +5V (SK4A) and
may be connected to the ADE7757 supply using jumper
JP15, or to its own supply.
The logic output CF can be directly connected to an LED
using JP14 (Position B) or to an optically isolated output (Posi-
tion A). By closing Positions A and B, both options are se-
lected. The optically isolated output is available at connector
SK5. This isolated output is useful when the evaluation board
is connected directly to a high voltage (e.g., 220 V residential). A
typical connection diagram for this isolated output is shown in
Figure 5.
JP14
A
B
R11
R12
VPLUS
U4
H11L1
R4
CFOUT
R5
VMINUS
SK5A
SK5B
+
5V to 12V
COUNTER
SK5C
Figure 5. Typical Connection for Opto Output
All logic outputs can be monitored via test points 6 to 8
(TP6 to TP8). These test points provide easy access for
scope probes and meter probes.
NEUTRAL PHASE
220V
SK1A
SHUNT SK1B
5A
2mV
SK1C
AGND VDD
AGND
V1N
V1P
SK5A
SK5B
SK5C
SK2A
SK2B
LOAD
JP1 = OPEN
JP2 = OPEN
JP3 = OPEN
JP4 = OPEN
JP5 = OPEN
JP6 = OPEN
JP7 = OPEN
JP8 = CLOSED
JP9 = N
JP5
R19
JP18
R20
JP6
C18
R21
R15
R22
JP11 = 1
JP12 = 1
JP13 = 0
JP14 = A,B
JP16 = P
JP17 = A
JP18 = CLOSED
R21 = REMOVED
B
JP17
A
TP4 V2
54.5mV
0.9776 Hz
FREQUENCY DISPLAY
100
imp/kWhr
Figure 6. ADE7757 Evaluation Board as an Energy Meter
EVALUATION BOARD SET UP AS AN ENERGY
METER
Figure 6 shows a wiring diagram that allows a simple
energy meter to be implemented using the ADE7757
evaluation board. The current transducer used in this ex-
ample is a 400 µΩ shunt. The meter is intended to be used
with a line voltage of 220 V and a maximum current of
25 A. The frequency outputs F1 and F2 can be used to
drive a mechanical counter. These outputs will be cali-
brated to provide 100 imp/kWhr. The logic output CF
has an output frequency that can be up to 2048 times higher
REV. PrF
–3–
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