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ADE9000 数据表(PDF) 27 Page - Analog Devices |
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ADE9000 数据表(HTML) 27 Page - Analog Devices |
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27 / 73 page  ADE9000 Data Sheet Rev. A | Page 26 of 72 THEORY OF OPERATION MEASUREMENTS Current Channel The ADE9000 has three phase current channels and one neutral current channel. The phase current channel datapath for IA, IB, and IC is shown in Figure 56 and datapath for the neutral channel is shown in Figure 57. ADC_REDIRECT Multiplexer The ADE9000 provides a multiplexer that allows any ADC output to be redirected to any digital processing datapath (see Figure 58). By default, each modulator is mapped to its corresponding datapath. Current Channel Gain, xIGAIN The ADE9000 provides current gain calibration registers (AIGAIN, BIGAIN, CIGAIN and NIGAIN), one for each current channel. The current channel gain varies with xIGAIN as shown in the following equation: Current Channel Gain = (1 + (xIGAIN/227)) xIGAIN HPF REFERENCE Σ-Δ MODULATOR IP VIN VIN IM SINC4 LPF 4:1 ZX DETECTION xIGAINx MTEN PHASE COMP WAVEFORM BUFFER WF_SRC INTEGRATOR HPFDIS INTEN ZX_SRC_SEL ICONSEL1 IB = –IA – IC WF_CAP_SEL xI_PCF RESAMPLING ADC_ REDIRECT MUX 1REGISTER ACCMODE, BIT ICONSEL ONLY AFFECTS IB CHANNEL CALCULATION. FUNDAMENTAL AND TOTAL ACTIVE AND REACTIVE POWER CALCULATIONS CURRENT PEAK DETECTION FAST RMS½, 10 CYCLE RMS/ 12 CYCLE RMS RMS_SRC_SEL FUNDAMENTAL AND TOTAL RMS, VA, THD CALCULATIONS +1V ANALOG INPUT RANGE 0V –1V Figure 56. Current Channel (IA, IB, IC) Datapath HPF REFERENCE Σ-Δ MODULATOR INP VIN INN SINC4 LPF 4:1 NIGAIN PHASE COMP WAVEFORM BUFFER WF_SRC INTEGRATOR HPFDIS ININTEN WF_CAP_SEL NI_PCF RESAMPLING ADC_ REDIRECT MUX VECTOR CURRENT SUM CALCULATIONS NEUTRAL CURRENT RMS NPHCAL FAST RMS½, 10 CYCLE RMS/ 12 CYCLE RMS RMS_SRC_SEL V +1V ANALOG INPUT RANGE 0V –1V IN Figure 57. Neutral Current Channel (IN) Datapath REFERENCE Σ-Δ MODULATOR VIN SINC4 IA_DIN IA_MOD AI_SINC_DAT AI_LPF_DAT NOTES 1. Ix_MOD AND Vx_MOD ARE THE RESPECTIVE MODULATOR OUTPUT. LPF 4:1 IA MODULATOR IA DIGITAL DATAPATH IA_MOD 011 IB_MOD IC_MOD IN_MOD VA_MOD VB_MOD VC_MOD IA_MOD 000 001 010 100 101 110 111 Figure 58. ADC_REDIRECT Modulator to Digital Datapath Multiplexing |
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