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ADE5166 数据表(PDF) 67 Page - Analog Devices |
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ADE5166 数据表(HTML) 67 Page - Analog Devices |
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67 / 156 page  ADE5166/ADE5169/ADE5566/ADE5569 Rev. B | Page 67 of 156 Integration Time Under Steady Load—Reactive Energy As mentioned in the Active Energy Calculation section, the discrete time sample period (T) for the accumulation register is 1.22 μs (5/MCLK). With full-scale sinusoidal signals on the analog inputs, and with the VARGAIN register (Address 0x1E) and the VARDIV register (Address 0x25) set to 0x000, the integration time before the reactive energy register overflows is calculated in Equation 24. Time = min 82 . 6 sec 6 . 409 s 22 . 1 0xCCCCD FFFF FFFF 0xFFFF = = μ × (24) When VARDIV is set to a value other than 0, the integration time varies, as shown in Equation 25. Time = TimeVARDIV = 0 × VARDIV (25) Reactive Energy Accumulation Modes Var Signed Accumulation Mode The ADE5169/ADE5569 reactive energy default accumulation mode is a signed accumulation based on the reactive power information. Var Antitamper Accumulation Mode The ADE5169/ADE5569 are placed in var antitamper accumu- lation mode by setting SAVARM (Bit 2) in the ACCMODE register (Address 0x0F). In this mode, the reactive power is accumulated depending on the sign of the active power. When the active power is positive, the reactive power is added as it is to the reactive energy register. When the active power is negative, the reactive power is subtracted from the reactive energy accumu- lator (see Figure 73). The CF pulse also reflects this accumulation method when in this mode. The default setting for this mode is off. Transitions in the direction of power flow and no load threshold are active in this mode. Var Absolute Accumulation Mode The ADE5169/ADE5569 are placed in absolute accumulation mode by setting ABSVARM (Bit 3) in the ACCMODE register (Address 0x0F). In absolute accumulation mode, the reactive energy accumulation is done by using the absolute reactive power and ignoring any occurrence of power below the no load threshold for the reactive energy (see Figure 74). The CF pulse also reflects this accumulation method when in the absolute accumulation mode. The default setting for this mode is off. Transitions in the direction of power flow and no load threshold are active in this mode. POS POS INTERRUPT STATUS REGISTERS NEG VARSIGN FLAG ACTIVE POWER NO LOAD THRESHOLD NO LOAD THRESHOLD REACTIVE ENERGY NO LOAD THRESHOLD REACTIVE POWER NO LOAD THRESHOLD Figure 73. Reactive Energy Accumulation in Var Antitamper Accumulation Mode REACTIVE ENERGY NO LOAD THRESHOLD NO LOAD THRESHOLD REACTIVE POWER Figure 74. Reactive Energy Accumulation in Absolute Accumulation Mode Reactive Energy Pulse Output The ADE5169/ADE5569 provide all the circuitry with a pulse output whose frequency is proportional to reactive power (see the Energy-to-Frequency Conversion section). This pulse fre- quency output uses the calibrated signal from the VARGAIN register output, and its behavior is consistent with the setting of the reactive energy accu-mulation mode in the ACCMODE register (Address 0x0F). The pulse output is active low and should preferably be connected to an LED, as shown in Figure 80. |
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