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ADE7880
HPFEN BIT
AIGAIN CONFIG3[0]
INTEN BIT
CONFIG[0]
Data Sheet
IA
APGAIN
AWATTOS
APHCAL
VA
AVGAIN
HPF
HPFEN BIT
CONFIG3[0]
HPF
LPSEL BIT
CONFIG3[1]
LPF
INSTANTANEOUS
PHASE A
ACTIVE POWER
:
AWATT
DIGITAL SIGNAL PROCESSOR
Figure 70. Total Active Power Data Path
2 4
0x339CBBC =
54,119,356
V rms × I rms
0x19CE5DE =
27,059,678
INSTANTANEOUS
POWER SIGNAL
p(t)= V rms × I rms – V rms × I rms × cos(2 ω t)
INSTANTANEOUS
ACTIVE POWER
SIGNAL: V rms × I rms
0
–5
–10
–15
0x000 0000
–20
i(t) = √ 2 × I rms × sin( ω t)
v(t) = √ 2 × V rms × sin( ω t)
Figure 71. Active Power Calculation
–25
0.1
1
3
10
Because LPF2 does not have an ideal brick wall frequency
response, the active power signal has some ripple due to the
instantaneous power signal. This ripple is sinusoidal and has a
frequency equal to twice the line frequency. Because the ripple
is sinusoidal in nature, it is removed when the active power
signal is integrated over time to calculate the energy. Bit 1
(LPFSEL) of CONFIG3 register selects the LPF2 strength. If
LPFSEL is 0 (default), the settling time is 650 ms and the ripple
attenuation is 65 dB. If LPFSEL is 1, the settling time is 1300 ms
and the ripple attenuation is 128 dB. Figure 72 shows the
frequency response of LPF2 when LPFSEL is 0 and Figure 73
shows the frequency response of LPF2 when LPFSEL is 1.
The ADE7880 stores the instantaneous total phase active
powers into the AWATT, BWATT, and CWATT registers. Their
equation is
FREQUENCY (Hz)
Figure 72. Frequency Response of the LPF Used to Filter Instantaneous Power
in Each Phase When the LPFSEL Bit of CONFIG3 is 0 (Default)
0
–10
–20
–30
U k
xWATT = ∑
∞
k = 1 U FS
×
I k
I FS
× cos( φ k – γ k ) × PMAX ×
1
2 4
(21)
–40
0.1 1 1 0
FREQUENCY (Hz)
Figure 73. Frequency Response of the LPF Used to Filter Instantaneous Power
where:
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 it is the instantaneous power computed
when the ADC inputs are at full scale and in phase.
The xWATT[23:0] waveform registers can be accessed using
various serial ports. Refer to the Waveform Sampling Mode
section for more details.
Rev. A | Page 44 of 104
in Each Phase when the LPFSEL Bit of CONFIG3 is 1
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