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ADE7978 数据表(PDF) 32 Page - Analog Devices |
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ADE7978 数据表(HTML) 32 Page - Analog Devices |
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32 / 120 page  ADE7978/ADE7933/ADE7932 Data Sheet Rev. 0 | Page 32 of 120 CURRENT CHANNEL ADC In this data sheet, the measurements obtained on the current channel of the ADE7933/ADE7932 devices that monitor Phase A, Phase B, and Phase C are called IA, IB, and IC, respectively (see Figure 101). The measurement obtained on the current channel of the ADE7933/ADE7932 device that monitors the neutral current is called IN (see Figure 102). Figure 42 shows the signal processing path for Input IA in the current channel (the path is the same for IB and IC). The ADC outputs are signed twos complement 24-bit data-words and are available at a rate 8000 samples per second (8 kSPS). With the specified full-scale analog input signal of ±31.25 mV, the ADC produces its maximum output code value. Figure 42 shows a full-scale voltage signal applied to the differential inputs (IP and IM). The ADC output swings from −5,320,000 to +5,320,000. Note that these are nominal values, and every ADE7978/ ADE7933/ADE7932 chipset varies around these values. Input IN corresponds to the neutral current of a 3-phase system. If the neutral line is not monitored, connect the DATA_N pin of the ADE7978 to VDD. The datapath of the neutral current is similar to the path of the phase currents, as shown in Figure 43. AIGAIN[23:0] HPFEN BIT CONFIG[4] HPF +31.25mV ANALOG INPUT RANGE 0V –31.25mV 0x512D40 = +5,320,000 CURRENT CHANNEL DATA RANGE ADC OUTPUT RANGE 0V 0xFFAED2C0 = –5,320,000 0x512D40 = +5,320,000 CURRENT CHANNEL DATA RANGE AFTER HPF 0V 0xFFAED2C0 = –5,320,000 TOTAL/FUNDAMENTAL ACTIVE AND REACTIVE POWER CALCULATION CURRENT PEAK, OVERCURRENT DETECTION FUNDAMENTAL CURRENT RMS (AFIRMS) CALCULATION CURRENT RMS (AIRMS) CALCULATIONS IAWV WAVEFORM SAMPLE REGISTER ZX DETECTION LPF1 REFERENCE PHASE A ADE7933 Σ-Δ MODULATOR IP VIN VIN IM DIGITAL LPF ATEMP[23:0] ATEMP0[23:0] TEMPCO[23:0] 1 ADE7978 0x512D40 = +5,320,000 ZX SIGNAL DATA RANGE 0V 0xFFAED2C0 = –5,320,000 Figure 42. Phase A Current Channel Signal Path NIGAIN[23:0] HPFEN BIT CONFIG[4] HPF CURRENT RMS (NIRMS) CALCULATION INWV WAVEFORM SAMPLE REGISTER REFERENCE NEUTRAL LINE ADE7933 Σ-Δ MODULATOR IP VIN IM DIGITAL LPF NTEMP[23:0] NTEMP0[23:0] TEMPCO[23:0] 1 ADE7978 Figure 43. Neutral Current Signal Path |
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