參數(shù)資料
型號(hào)： ADE7754ARRL
廠商： ANALOG DEVICES INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： ADE7754
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO24
封裝： MS-013AD, SOIC-24
文件頁數(shù)： 27/44頁
文件大?。?/td> 630K
代理商： ADE7754ARRL
REV. PrG 01/03
PRELIMINARY TECHNICAL DATA
ADE7754
–
27
–
00000h
F97247h
D1B71h
68DB9h
+ 100% FS
+ 50% FS
AVAGAIN[11:0]
- 100% FS
- 150% FS
F2E48Fh
EC56D7h
+ 150% FS
- 50% FS
13A929h
000h 7FFh
800h
Apparent Power
Voltage channel and Current channel 0.5V / GAIN
Figure 33 - Apparent Power Calculation Output range
Apparent Power Offset Calibration
Each RMS measurement includes an offset compensation
register to calibrate and eliminate the DC component in the
RMS value -see
Current RMS calculation and Voltage RMS
calculation
. The Voltage and Current RMS values are then
multiplied together in the Apparent Power signal processing.
As no additional offsets are created in the multiplication of
the RMS values, there is no specific offset compensation in
the Apparent Power signal processing. The offset compensa-
tion of the Apparent Power measurement in each phase is
done by calibrating each individual RMS measurements.
TOTAL APPARENT POWER CALCULATION
The sum of the Apparent powers coming from each phase
gives the total Apparent Power consumption. Different com-
binations of the three phases can be selected in the sum by
setting bits 7-6 of the VAMode register (mnemonic
VAMOD[1:0]). Figure 34 demonstrates the calculation of
the total apparent power.
I
A
V
A
PHASE A*
Total Apparent
Power Signal
PHASE B*
I
B
PHASE C*
I
C
RMS
24
AAPGAIN
AVAGAIN
RMS
AVGAIN
V
B
RMS
24
BAPGAIN
BVAGAIN
RMS
BVGAIN
V
C
RMS
24
CAPGAIN
CVAGAIN
RMS
CVGAIN
S
+
+
2
V
Arms
V
Crms
V
Arms
V
Crms
Figure 34- Total Apparent Power calculation
APPARENT POWER CALCULATION
Apparent power is defined as the maximum active power that
can be delivered to a load. As Vrms and Irms are the effective
voltage and current delivered to the load, the Apparent Power
(AP) is defined as V
rms
x I
rms
.
Note that the Apparent power is equal to the multiplication
of the RMS values of the voltage and current inputs. For a
poly-phase system, the RMS values of the current and voltage
inputs of each phase (A, B and C) are multiplied together to
obtain the apparent power information of each phase. The
total apparent power is the sum of the apparent powers of all
the phases. The different solutions available to process the
total apparent power are discussed in the following para-
graph.
Figure 32 illustrates graphically the signal processing in each
phase for the calculation of the Apparent Power in the
ADE7754.
24
0.5V / GAIN2
24
0.5V / GAIN1
1CF68Ch
Current RMS Signal - i(t)
Voltage RMS Signal - v(t)
MULTIPLIER
Apparent Power
Signal - P
Irms
Vrms
00h
00h
D1B71h
AVAG
12
24
1CF68Ch
Figure 32 - Apparent Power Signal Processing
The Apparent Power is calculated with the Current and
Voltage RMS values obtained in the RMS blocks of the
ADE7754. Shown in Figure 33 is the maximum code
(Hexadecimal) output range of the Apparent Power signal for
each phase. Note that the output range changes depending on
the contents of the Apparent Power Gain registers but also on
the contents of the Active Power Gain and Voltage Gain
registers
–
see
Current RMS calculation and Voltage RMS
calculation
. Only the effect of the Apparent Power Gain is
shown on Figure 33. The minimum output range is given
when the Apparent Power Gain register content is equal to
800h and the maximum range is given by writing 7FFh to the
Apparent Power Gain register. This can be used to calibrate
the Apparent Power (or Energy) calculation in the ADE7754
for each phase and also the Total Apparent Energy -see
Total
Apparent Power calculation
.
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