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參數資料
型號: ADE7752BARW-RL
廠商: ANALOG DEVICES INC
元件分類: 模擬信號調理
英文描述: Polyphase Energy Metering IC with Pulsed Output
中文描述: SPECIALTY ANALOG CIRCUIT, PDSO24
封裝: MS-013AD, SOIC-24
文件頁數: 16/27頁
文件大小: 342K
代理商: ADE7752BARW-RL
ADE7752B
Preliminary Technical Data
TYPICAL CONNECTION DIAGRAMS
CURRENT CHANNEL CONNECTION
Figure 19 shows a typical connection diagram for the current
channel (IA). A current transformer (CT) is the current trans-
ducer selected for this example. Notice 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.
Rev. PrA | Page 16 of 27
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.
IAP
±
500mV
R
b
Rf
Rf
CT
NEUTRAL
PHASE
IP
IAN
Cf
Cf
0
Figure 19. Typical Connection for Current Channels
VOLTAGE CHANNELS CONNECTION
Figure 20 shows two typical connections for the voltage chan-
nel. The first option uses a potential transformer (PT) to pro-
vide complete isolation from the main voltage. In the second
option, the ADE7752B 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 the
noise.
±
500mV
Ra
*
Rb
*
VR
*
VAP
AGND
Rf
Rf
PT
NEUTRAL
PHASE
VN
Cf
Cf
VAP
Rf
NEUTRAL
PHASE
VN
Cf
Cf
*
Ra >> Rf + VR;
*
Rb + VR = Rf
0
±
500mV
Figure 20. Typical Connections for Voltage Channels
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 6).
(
ω
×
×
=
cos
2
V
V
l
B
B
( )
)
( )
( )
π
3
+
ω
×
×
=
π
3
+
ω
×
×
=
4
cos
2
2
cos
2
t
V
V
t
t
V
V
l
C
C
l
A
A
(6)
where
V
A
,
V
B
, and
V
C
represent the voltage rms values of the
different phases.
The current inputs are represented by
( )
(
)
( )
( )
φ
+
π
3
+
ω
×
=
φ
+
π
3
+
ω
×
=
φ
2
+
ω
×
=
C
l
C
C
B
l
B
B
A
l
A
A
t
I
I
t
I
I
t
I
I
4
cos
2
cos
2
cos
2
(7)
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)
Then:
( )
t
(
)
(
)
( )
t
(
)
( )
t
(
)
φ
+
π
3
+
ω
×
×
φ
×
×
=
φ
+
π
3
+
ω
×
×
φ
×
×
=
φ
4
+
ω
×
×
φ
×
×
=
C
l
C
C
C
C
C
C
B
l
B
B
B
B
B
B
A
l
A
A
A
A
A
A
t
I
V
I
V
P
t
I
V
I
V
P
t
I
V
I
V
P
8
2
cos
cos
2
cos
cos
2
cos
cos
(8)
As shown in Equation 8, in the ADE7752B, the active power
calculation per phase is made when current and voltage inputs
of one phase are connected to the same channel (A, B, or C).
Then the summation of each individual active power calcula-
tion gives the total active power information,
P
(
t
) =
P
A
(
t
) +
P
B
(
t
) +
P
C
(
t
).
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