參數(shù)資料
型號(hào)： ADE7878ACPZ-RL
廠商： ANALOG DEVICES INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： Poly Phase Multifunction Energy Metering IC With Total And Fundamental Powers, No Of Pins: 40, Temperature Range: Ind
中文描述： SPECIALTY ANALOG CIRCUIT, QCC40
封裝： 6 X 6 MM, ROHS COMPLIANT, MO-220WJJD, LFCSP-40
文件頁數(shù)： 50/96頁
文件大?。?/td> 1096K
代理商： ADE7878ACPZ-RL
ADE7854/ADE7858/ADE7868/ADE7878
Rev. E | Page 54 of 96
The ADE7854/ADE7858/ADE7868/ADE7878 store the instan-
taneous phase apparent powers into the AVA, BVA, and CVA
registers. Their expression is
APPARENT POWER CALCULATION
Apparent power is defined as the maximum power that can be
delivered to a load. One way to obtain the apparent power is by
multiplying the voltage rms value by the current rms value (also
called the arithmetic apparent power)
4
2
1
×
=
PMAX
I
U
xVA
FS
(40)
S = V rms × I rms
(39)
where:
U, I are the rms values of the phase voltage and current.
where:
UFS, IFS are the rms values of the phase voltage and current when
the ADC inputs are at full scale.
S is the apparent power.
V rms and I rms are the rms voltage and current, respectively.
PMAX = 33,516,139, the instantaneous power computed when
the ADC inputs are at full scale and in phase.
The ADE7854/ADE7858/ADE7868/ADE7878 compute the
arithmetic apparent power on each phase. Figure 68 illustrates
the signal processing in each phase for the calculation of the
apparent power in the ADE78xx. Because V rms and I rms con-
tain all harmonic information, the apparent power computed by
the ADE78xx is total apparent power. The ADE7878 does not
compute fundamental apparent power because it does not measure
the rms values of the fundamental voltages and currents.
The xVA[23:0] waveform registers may be accessed using
various serial ports. Refer to the Waveform Sampling Mode
section for more details.
The ADE7854/ADE7858/ADE7868/ADE7878 can compute the
apparent power in an alternative way by multiplying the phase
rms current by an rms voltage introduced externally. See the
AVAHR[31:0]
AVAGAIN
DIGITAL SIGNAL PROCESSOR
AIRMS
ACCUMULATOR
AVRMS
VATHR[47:0]
AVA
24
32-BIT REGISTER
08
51
0-
04
8
Figure 68. Apparent Power Data Flow and Apparent Energy Accumulation
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