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ADE7978 数据表(PDF) 71 Page - Analog Devices |
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ADE7978 数据表(HTML) 71 Page - Analog Devices |
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71 / 120 page  Data Sheet ADE7978/ADE7933/ADE7932 Rev. 0 | Page 71 of 120 Bits[3:2] (VARACC[1:0]) in the ACCMODE register specify the accumulation mode of the total and fundamental reactive powers when signals proportional to the reactive powers are selected at the CFx pins (the CFxSEL[2:0] bits in the CFMODE register are set to 001 or 100). These bits also specify the accumulation mode of the var-hour energy registers (AVARHR, BVARHR, CVARHR, AFVARHR, BFVARHR, and CFVARHR). When VARACC[1:0] = 00 (the default value), the reactive powers are sign accumulated in the var-hour energy registers before entering the energy-to-frequency converter. Figure 90 shows how signed reactive power accumulation works. In this mode, the CFx pulses synchronize perfectly with the reactive energy accumulated in the xVARHR and xFVARHR registers because the powers are sign accumulated in both datapaths. 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 90. Reactive Power Signed Accumulation Mode The VARACC[1:0] = 01 setting is reserved, and the ADE7978 behaves identically to the case when VARACC[1:0] = 00. When VARACC[1:0] = 10, the reactive powers are accumulated depending on the sign of the corresponding active power in the var-hour energy registers before entering the energy-to-frequency converter. If the active power is positive or considered 0 when lower than the no load threshold APNOLOAD, the reactive power is accumulated as is. If the active power is negative, the sign of the reactive power is changed for accumulation. Figure 91 shows how the sign adjusted reactive power accumu- lation mode works. In this mode, the CFx pulses synchronize perfectly with the reactive energy accumulated in the xVARHR and xFVARHR registers because the powers are accumulated in the same way in both datapaths. POS POS VARNOLOAD SIGN = POSITIVE NEG NO LOAD THRESHOLD NO LOAD THRESHOLD NO LOAD THRESHOLD REACTIVE POWER ACTIVE POWER REACTIVE ENERGY REVRPx BIT IN STATUS0 xVARSIGN BIT IN PHSIGN Figure 91. Reactive Power Sign Adjusted Mode When VARACC[1:0] = 11, the reactive powers are accumulated in absolute mode. When the powers are negative, they change sign and are accumulated together with the positive power in the var-hour registers before entering the energy-to-frequency converter. In this mode, the CFx pulses synchronize perfectly with the reactive energy accumulated in the xVARHR and xFVARHR registers. Figure 92 shows how absolute reactive power accumulation works. 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 92. Reactive Power Absolute Accumulation Mode |
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