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PDF ( 数据手册 , 数据表 ) ADE7752B

零件编号 ADE7752B
描述 Polyphase Energy Metering IC
制造商 Analog Devices
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ADE7752B 数据手册, 描述, 功能
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Polyphase Energy Metering IC with Pulsed
Output
Preliminary Technical Data
ADE7752B
FEATURES
High accuracy supports 50 Hz/60 Hz IEC62053-21
Less than 0.1% error over a dynamic range of 500 to 1
Compatible with 3-phase 3-wire delta and 3-phase 4-wire Wye
configurations
Supplies average active power on the frequency outputs F1 and F2
High frequency output (CF) is intended for calibration and
supplies instantaneous active power
Logic output REVP indicates a potential miswiring or negative
power on the sum of all phases
Direct drive for electromechanical counters and 2-phase stepper
motors (F1 and F2)
Proprietary ADCs and DSP provide high accuracy over large
variations in environmental conditions and time
On-chip power supply monitoring
On-chip creep protection (no load threshold) based on the sum
of the three phases
On-chip reference 2.4 V ± 8% (25 ppm/°C typical) with external
overdrive capability
Single 5 V supply, low power (TBD mW typical)
Low cost CMOS process
GENERAL DESCRIPTION
The ADE7752B1 is an accurate active energy measurement IC
intended for use in any 3-phase distribution system and has
enhanced features that make it better suited for 3-phase 3-wire
applications compared to the ADE7752/52A.
The no-load threshold and reverse polarity indication are based
on the sum of the three phase energies in the ADE7752B. The
ADE7752B specifications surpass the accuracy requirements as
quoted in the IEC62053-21 standard.
The only analog circuitry used in the ADE7752B is in the
analog-to-digital converters (ADCs) and reference circuit. All
other signal processing (for example, multiplication, filtering,
and summation) is carried out in the digital domain. This
approach provides superior stability and accuracy over
extremes in environmental conditions and over time.
The ADE7752B supplies average active power information on
the low frequency outputs, F1 and F2. These logic outputs can
be used to directly drive an electromechanical counter or to
interface with an MCU. The CF logic output gives
instantaneous active power information. This output is
intended to be used for calibration purposes.
The ADE7752B includes a power supply monitoring circuit on
the VDD pin. The ADE7752B remains inactive until the supply
voltage on VDD reaches 4 V. If the supply falls below 4 V, the
ADE7752B also resets and no pulses are issued on F1, F2, and CF.
Internal phase matching circuitry ensures that the voltage and
current channels are phase matched. An internal no load
threshold ensures the ADE7752B does not exhibit any creep
when there is no load.
The ADE7752B is available in a 24-lead SOIC package.
1 Patent pending.
FUNCTIONAL BLOCK DIAGRAM
ABS
17
VDD
3
IAP 5
IAN 6
VAP 16
IBP 7
IBN 8
VBP 15
ADC
ADC
ADC
ADC
ICP 9
ICN 10
VCP 14
VN 13
ADC
ADC
4kΩ
2.4V REF
HPF
Φ
PHASE
CORRECTION
HPF
Φ
PHASE
CORRECTION
HPF
Φ
PHASE
CORRECTION
X
LPF
POWER
SUPPLY
MONITOR
ADE7752B
XΣ
LPF
2 DGND
19 CLKIN
20 CLKOUT
X
LPF
DIGITAL-TO-FREQUENCY CONVERTER
11 12
4 18 21 22 23 24 1
AGND
REFIN/OUT
REVP SCF S0 S1 F2 F1 CF
Figure 1.
Rev. PrA
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2006 Analog Devices, Inc. All rights reserved.







ADE7752B pdf, 数据表
ADE7752B
Pin No.
20
Mnemonic
CLKOUT
21, 22
23, 24
S0, S1
F2, F1
Preliminary Technical Data
Description
A crystal can be connected across this pin and CLKIN as described previously to provide a clock source
for the ADE7752B. The CLKOUT pin can drive one CMOS load when an external clock is supplied at
CLKIN or when a crystal is being used.
These logic inputs are used to select one of four possible frequencies for the digital-to-frequency
conversion for design flexibility.
Low Frequency Logic Outputs. F1 and F2 supply average active power information. The logic outputs
can be used to drive electromechanical counters and 2-phase stepper motors directly (see the Transfer
Function section).
Rev. PrA | Page 8 of 27







ADE7752B equivalent, schematic
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.
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.
CT
Rb
Rf
±500mV
IAP
Cf
IAN
IP Rf Cf
PHASE NEUTRAL
Figure 19. Typical Connection for Current 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).
VA (t ) = 2 × VA × cos (ωlt )
VB (t ) =
2
× VB
× cos ⎜⎝⎛ ωlt
+
2π
3
⎟⎠⎞
V C (t ) =
2
× VC
×
cos
⎜⎝⎛ ωlt
+
4π
3
⎟⎠⎞
(6)
where VA, VB, and VC represent the voltage rms values of the
different phases.
The current inputs are represented by
( )I A (t ) = 2 I A × cos ωlt + φ A
I B (t ) =
2
IB
× cos
⎩⎨⎧ωl t
+
2π
3
+
φB
⎭⎬⎫
IC (t ) =
2
IC
× cos
⎩⎨⎧ωl t
+
4π
3
+
φC
⎭⎬⎫
(7)
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.
PT Rf
PHASE NEUTRAL
±500mV
AGND
Rf
VAP
Cf
VN
Cf
Ra* Cf
Rb*
VR*
±500mV
VAP
Rf VN
PHASE NEUTRAL
* Ra >> Rf + VR; * Rb + VR = Rf
Cf
Figure 20. Typical Connections for Voltage Channels
where:
IA, IB, and IC represent the rms value of the current of each
phase.
φA, φB, and φC represent the phase difference of the current and
voltage channel of each phase.
The instantaneous powers can then be calculated as follows:
PA(t) = VA(t) × IA(t)
PB(t) = VB(t) × IB(t)
PC(t) = VC(t) × IC(t)
Then:
( )PA(t ) = VA × IA × cos(φA ) VA × IA ×cos 2ωlt + φA
PB (t )
= VB
×
IB
×
cos(φB ) VB
×
IB
×cos
⎜⎝⎛ 2ωlt
+
4π
3
+
φB
⎟⎠⎞
PC (t )
=
VC
×
IC
×
cos(φC
)
VC
×
IC
×cos
⎜⎛
2ωlt
+
8π
3
+
φC
⎟⎞
(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) = PA(t) +
PB(t) + PC(t).
Rev. PrA | Page 16 of 27










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