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(yè)數(shù)： 57/96頁(yè)
文件大?。?/td> 1096K
代理商： ADE7878ACPZ-RL
ADE7854/ADE7858/ADE7868/ADE7878
Rev. E | Page 60 of 96
Bits[14:12] (CF3LATCH, CF2LATCH, and CF1LATCH) of the
CFMODE register enable this process when set to 1. When
cleared to 0, the default state, no latch occurs. The process is
available even if the CFx output is not enabled by the CFxDIS
bits in the CFMODE register.
CF Outputs for Various Accumulation Modes
Bits[1:0] (WATTACC[1:0]) in the ACCMODE register deter-
mine the accumulation modes of the total active and fundamental
powers when signals proportional to the active powers are chosen
at the CFx pins (the CFxSEL[2:0] bits in the CFMODE register
equal 000 or 011). When WATTACC[1:0] = 00 (the default value),
the active powers are sign accumulated before entering the energy-
to-frequency converter. Figure 73 shows how signed active power
accumulation works. In this mode, the CFx pulses synchronize
perfectly with the active energy accumulated in xWATTHR regis-
ters because the powers are sign accumulated in both data paths.
NEG
POS
APNOLOAD
SIGN = POSITIVE
NEG
NO-LOAD
THRESHOLD
ACTIVE POWER
NO-LOAD
THRESHOLD
ACTIVE ENERGY
REVAPx BIT
IN STATUS0
xWSIGN BIT
IN PHSIGN
08
51
0-
05
3
Figure 73. Active Power Signed Accumulation Mode
When WATTACC[1:0] = 11, the active powers are accumulated
in absolute mode. When the powers are negative, they change
sign and accumulate together with the positive power. Figure 74
shows how absolute active power accumulation works. Note
that in this mode, the xWATTHR registers continue to accumulate
active powers in signed mode, even if the CFx pulses are gener-
ated based on the absolute accumulation mode.
Bits[3:2] (VARACC[1:0]) in the ACCMODE register determine the
accumulation modes of the total and fundamental reactive powers
when signals proportional to the reactive powers are chosen at the
CFx pins (the CFxSEL[2:0] bits in the CFMODE register equal
001 or 100). When VARACC[1:0] = 00, the default value, the
reactive powers are sign accumulated before entering the
energy-to-frequency converter. Figure 75 shows how signed
reactive power accumulation works. In this mode, the CFx
pulses synchronize perfectly with the reactive energy accumu
lated in the xVARHR registers because the powers are sign
accumulated in both datapaths.
NEG
POS
APNOLOAD
SIGN = POSITIVE
NEG
NO-LOAD
THRESHOLD
ACTIVE POWER
NO-LOAD
THRESHOLD
ACTIVE ENERGY
REVAPx BIT
IN STATUS0
xWSIGN BIT
IN PHSIGN
08
51
0-
05
4
Figure 74. Active Power Absolute Accumulation Mode
NEG
POS
VARNOLOAD
SIGN = POSITIVE
NEG
NO-LOAD
THRESHOLD
REACTIVE
POWER
NO-LOAD
THRESHOLD
REACTIVE
ENERGY
REVRPx BIT
IN STATUS0
xVARSIGN BIT
IN PHSIGN
08
51
0-
15
3
Figure 75. Reactive Power Signed Accumulation Mode
When VARACC[1:0] = 10, the reactive powers are accumulated
depending on the sign of the corresponding active power. If the
active power is positive, the reactive power is accumulated as is.
If the active power is negative, the sign of the reactive power is
changed for accumulation. Figure 76 shows how the sign adjusted
reactive power accumulation mode works. In this mode, the
xVARHR registers continue to accumulate reactive powers in
signed mode, even if the CFx pulses are generated based on the
sign adjusted accumulation mode.
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