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ADE7880 数据表(PDF) 68 Page - Analog Devices |
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ADE7880 数据表(HTML) 68 Page - Analog Devices |
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68 / 104 page  ADE7880 Data Sheet Rev. A | Page 68 of 104 converter. In this mode, the CFx pulses synchronize perfectly with the active energy accumulated in xWATTHR registers because the powers are accumulated in the same way in both data paths. Figure 92 shows how absolute active power accumulation works. NEG POS POS APNOLOAD SIGN = POSITIVE NEG NO-LOAD THRESHOLD ACTIVE POWER NO-LOAD THRESHOLD ACTIVE ENERGY REVAPx BIT IN STATUS0 xWSIGN BIT IN PHSIGN Figure 91. Active Power Positive Only Accumulation Mode Bits[3:2] (VARACC[1:0]) in the ACCMODE register determine the accumulation modes of the fundamental reactive powers when signals proportional to the fundamental reactive powers are chosen at the CFx pins (the CFxSEL[2:0] bits in the CFMODE register equal 100). When VARACC[1:0] = 00, the default value, the fundamental reactive powers are sign accumulated in the var-hour energy registers and before entering the energy-to- frequency converter. Figure 93 shows how signed fundamental reactive power accumulation works. In this mode, the CFx pulses synchronize perfectly with the fundamental reactive energy accumulated in the xFVARHR registers because the powers are sign accumulated in both data paths. VARACC[1:0] = 01 setting is reserved and ADE7880 behaves identically to the case when VARACC[1:0] = 00. When VARACC[1:0] = 10, the fundamental reactive powers are accumulated depending on the sign of the corresponding active power in the var-hour energy registers and before entering the energy-to-frequency converter. If the fundamental active power is positive or considered 0 when lower than the no load threshold, the fundamental reactive power is accumulated as is. If the fundamental active power is negative, the sign of the fundamental reactive power is changed for accumulation. Figure 94 shows how the sign adjusted fundamental reactive power accumulation mode works. In this mode, the CFx pulses synchronize perfectly with the fundamental reactive energy accumulated in xFVARHR registers because the powers are accumulated in the same way in both data paths. NEG POS POS APNOLOAD SIGN = POSITIVE NEG NO-LOAD THRESHOLD ACTIVE POWER NO-LOAD THRESHOLD ACTIVE ENERGY REVAPx BIT IN STATUS0 xWSIGN BIT IN PHSIGN Figure 92. Active Power Absolute Accumulation Mode NEG POS POS VARNOLOAD SIGN = POSITIVE NEG NO-LOAD THRESHOLD REACTIVE POWER NO-LOAD THRESHOLD REACTIVE ENERGY REVRPx BIT IN STATUS0 xVARSIGN BIT IN PHSIGN Figure 93. Fundamental Reactive Power Signed Accumulation Mode When VARACC[1:0] = 11, the fundamental reactive powers are accumulated in absolute mode. When the powers are negative, they change sign and accumulate together with the positive power in the var-hour registers. CFx pulses are generated based on signed accumulation mode. In this mode, the CFx pulses do not synchronize perfectly with the fundamental reactive energy accumulated in x VARHR registers because the powers are accumulated differently in each data path. Figure 95 shows how absolute fundamental reactive power accumulation works. Sign of Sum-of-Phase Powers in the CFx Datapath The ADE7880 has sign detection circuitry for the sum of phase powers that are used in the CFx data path. As seen in the beginning of the Energy-to-Frequency Conversion section, the energy accumulation in the CFx data path is executed in two stages. Every time a sign change is detected in the energy accumulation at the end of the first stage, that is, after the |
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