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Data Sheet
ZXSEL[0] IN
LCYCMODE[7:0]
ADE7880
power is by multiplying the voltage rms value by the current
ZERO-
CROSSING
DETECTION
(PHASE A)
rms value (also called the arithmetic apparent power).
S = V rms × I rms
(40)
ZXSEL[1] IN
LCYCMODE[7:0]
ZERO-
CROSSING
DETECTION
(PHASE B)
ZXSEL[2] IN
LCYCMODE[7:0]
ZERO-
CROSSING
DETECTION
(PHASE C)
LINECYC[15:0]
CALIBRATION
CONTROL
where:
S is the apparent power.
V rms and I rms are the rms voltage and current, respectively.
The ADE7880 computes the arithmetic apparent power on each
phase. Figure 79 illustrates the signal processing in each phase
for the calculation of the apparent power in the ADE7880 .
Because V rms and I rms contain all harmonic information, the
apparent power computed by the ADE7880 is total apparent
power. The ADE7880 computes fundamental and harmonic
APGAIN
AFVAROS
AFVARHR[31:0]
apparent powers determined by the fundamental and harmonic
OUTPUT FROM
FUNDAMENTAL REACTIVE
POWER ALGORITHM
34
INTERNAL
ACCUMULATOR
THRESHOLD
27 26
0
32-BIT
REGISTER
components of the voltages and currents. See the Harmonics
Calculations section for details.
The ADE7880 stores the instantaneous phase apparent powers
into the AVA, BVA, and CVA registers. Their equation is
× × PMAX × 4
VARTHR 0
Figure 78. Line Cycle Fundamental Reactive Energy Accumulation Mode
xVA =
U
U FS
I 1
I FS 2
(41)
Phase A, Phase B, and Phase C zero crossings are, respectively,
included when counting the number of half line cycles by
setting Bits[5:3] (ZXSEL[x]) in the LCYCMODE register. Any
combination of the zero crossings from all three phases can be
used for counting the zero crossing. Select only one phase at a
time for inclusion in the zero-crossings count during calibration.
For details on setting the LINECYC register and the Bit 5
(LENERGY) in the MASK0 interrupt mask register associated
with the line cycle accumulation mode, see the Line Cycle
Active Energy Accumulation Mode section.
APPARENT POWER CALCULATION
Apparent power is defined as the maximum active power that
can be delivered to a load. One way to obtain the apparent
APGAIN
AIRMS
where:
U, I are the rms values of the phase voltage and current.
U FS , I FS are the rms values of the phase voltage and current when
the ADC inputs are at full scale.
PMAX = 27,059,678, the instantaneous power computed when
the ADC inputs are at full scale and in phase.
The xVA[23:0] waveform registers may be accessed using
various serial ports. Refer to the Waveform Sampling Mode
section for more details.
The ADE7880 can compute the apparent power in an alternative
way by multiplying the phase rms current by an rms voltage
introduced externally. See the Apparent Power Calculation
Using VNOM section for details.
AVAHR[31:0]
INTERNAL
ACCUMULATOR
AVRMS
DIGITAL SIGNAL
PROCESSOR
:
2 4
AVA
THRESHOLD
34
27 26
VATHR
0
0
32-BIT REGISTER
Figure 79. Apparent Power Data Flow and Apparent Energy Accumulation
Rev. A | Page 53 of 104
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