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ADE9078 数据表(PDF) 35 Page - Analog Devices |
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ADE9078 数据表(HTML) 35 Page - Analog Devices |
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35 / 108 page  ADE9078 Data Sheet Rev. 0 | Page 34 of 107 Table 11. Voltage Channel Measurement Update Rates Register Name Description Update Rate AV_SINC_DAT VA sinc4 filter output 16 kSPS BV_SINC_DAT VB sinc4 filter output 16 kSPS CV_SINC_DAT VC sinc4 filter output 16 kSPS AV_LPF_DAT VA sinc4 + IIR low-pass filter and decimator output fDSP = 4 kSPS BV_LPF_DAT VB sinc4 + IIR low-pass filter and decimator output fDSP = 4 kSPS CV_LPF_DAT VC sinc4 + IIR low-pass filter and decimator output fDSP = 4 kSPS AV_PCF Instantaneous voltage on VA fDSP = 4 kSPS BV_PCF Instantaneous voltage on VB fDSP = 4 kSPS CV_PCF Instantaneous voltage on VC fDSP = 4 kSPS AVRMS Filtered based total rms of VA fDSP = 4 kSPS BVRMS Filtered based total rms of VB fDSP = 4 kSPS CVRMS Filtered based total rms of VC fDSP = 4 kSPS VPEAK Peak current channel sample (see the Peak Detection section) fDSP = 4 kSPS APERIOD Line period measurement on VA fDSP = 4 kSPS BPERIOD Line period measurement on VB fDSP = 4 kSPS CPERIOD Line period measurement on VB fDSP = 4 kSPS COM_PERIOD Line period measurement on combined signal from VA, VB, VC (see the Combined Voltage Zero Crossing section) fDSP = 4 kSPS ANGLx_x Voltage to current or current to current phase angle (see the Angle Measurement section) CLKIN/24 = 512 kSPS Voltage Channel The voltage channel datapath is shown in Figure 52. The voltage channel ADC waveforms can be sampled at the sinc4 output, in the xV_SINC_DAT registers, at 16 kSPS or further decimated by an IIR low-pass filter, in xV_LPF_DAT registers at fDSP = 4 kSPS. Gain and phase compensation are applied, creating the xV_PCF instantaneous voltage waveforms that update at fDSP = 4 kSPS. The xV_PCF waveforms are used for total active power, VAR, IRMS, VA, and fundamental VAR calculations. The xV_PCF value is also monitored in the voltage peak detection circuit. Finally, angle measurements indicate the time between the voltage channel zero crossing and the current channel zero crossing on the same phase or voltage channels on the other phases, updating at CLKIN/24 = 512 kSPS in the ANGLx_x registers. The line period measurement xPERIOD indicates the line period, as described in the Line Period Calculation section. Voltage Channel Measurements Table 11 indicates the registers that hold voltage channel measurements and the rate at which they update. Voltage Channel Gain Use the xVGAIN registers to calibrate the voltage channel of each phase. The xVGAIN register has the same scaling as the xIGAIN register. GAIN HPF xIGAIN Gain Channel Voltage _ 2 1 27 × + = See the Current Channel Gain, xIGAIN section for more information about the gain scaling and how it is affected by the high-pass filter corner (HPF_CRN) selection. Note that for a given phase, |Current Channel Gain × Voltage Channel Gain × Power Gain| ≤ 3.75 Energy Measurements Overview Figure 53 shows how AI_PCF and AV_PCF calculate per phase rms and power and how the calculated rms and power are accumulated into the AWATTHR and AWATT_ACC registers and the CFx pulse outputs. Per Phase Energy Measurements Update Rate Instantaneous power measurements, including as xWATT, xVAR, xVA, xFVAR, update at a rate of fDSP = 4 kSPS. These measurements are accumulated into power measurements in xWATT_ACC register that update at a user defined interval ranging from 500 µs to 2 sec, depending on the selection in the PWR_TIME register. Energy measurements update every 4 kSPS by default and can store up to 211 sec of accumulation at full scale. Alternatively, these registers can be set into a different accumulation mode where they update after a user defined number of line cycles or samples. The power factor measurements update every 4096/4 kSPS = 1.024 sec. |
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