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ADE7932 数据表(PDF) 35 Page - Analog Devices |
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ADE7932 数据表(HTML) 35 Page - Analog Devices |
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35 / 120 page  Data Sheet ADE7978/ADE7933/ADE7932 Rev. 0 | Page 35 of 120 VOLTAGE CHANNEL ADCs In this data sheet, the measurements obtained on the voltage channel of the ADE7933/ADE7932 devices that monitor Phase A, Phase B, and Phase C are called VA, VB, and VC, respectively. The measurement obtained on the voltage channel of the ADE7933/ ADE7932 device that monitors the neutral current is called VN (see Figure 102). VA, VB, VC, and VN represent the signals mea- sured between the V1P and VM pins of the ADE7933/ADE7932 devices in the system. The signals measured between the V2P and VM pins of the ADE7933/ADE7932 devices are called VA2, VB2, VC2, and VN2 (see the Second Voltage Channel and Temperature Measurement section). Figure 46 shows the ADC and signal processing chain for Input VA in the voltage channel (the path is the same for VB and VC). The ADC outputs are signed twos complement 24-bit words and are available at a rate of 8 kSPS. With the specified full-scale analog input signal of ±0.5 V, the ADC produces its maximum output code value. Figure 46 shows a full-scale voltage signal applied to the differential inputs (V1P and VM). The ADC output swings from −5,320,000 to +5,320,000. Note these are nominal values, and every ADE7978/ADE7933/ ADE7932 chipset varies around these values. Input VN between the V1P and VM pins of the neutral line ADE7933/ADE7932 corresponds to the earth to neutral voltage of a 3-phase system. If no voltage is monitored at the V1P pin, connect the V1P pin to the VM pin. The datapath of the earth to neutral voltage is similar to the path of the phase voltages, as shown in Figure 47. AVGAIN[23:0] HPFEN BIT CONFIG[4] HPF +0.5V ANALOG INPUT RANGE 0V –0.5V 0x512D40 = +5,320,000 VOLTAGE CHANNEL DATA RANGE ADC OUTPUT RANGE 0V 0xFFAED2C0 = –5,320,000 0x512D40 = +5,320,000 ZX SIGNAL DATA RANGE 0V 0xFFAED2C0 = –5,320,000 TOTAL/FUNDAMENTAL ACTIVE AND REACTIVE POWER CALCULATION FUNDAMENTAL VOLTAGE RMS (AFVRMS) CALCULATION VOLTAGE RMS (AVRMS) CALCULATION VAWV WAVEFORM SAMPLE REGISTER VOLTAGE PEAK, OVERVOLTAGE, SAG DETECTION ZX DETECTION LPF1 REFERENCE PHASE A ADE7933 Σ-Δ MODULATOR V1P VIN VM DIGITAL LPF ADE7978 VIN Figure 46. Phase A to Neutral Voltage Channel Datapath NVGAIN[23:0] HPFEN BIT CONFIG[4] HPF +0.5V ANALOG INPUT RANGE 0V –0.5V 0x512D40 = +5,320,000 VOLTAGE CHANNEL DATA RANGE ADC OUTPUT RANGE 0V 0xFFAED2C0 = –5,320,000 VOLTAGE RMS (NVRMS) CALCULATION VNWV WAVEFORM SAMPLE REGISTER REFERENCE NEUTRAL LINE ADE7933 Σ-Δ MODULATOR V1P VIN VM DIGITAL LPF ADE7978 VIN Figure 47. Earth to Neutral Voltage Channel Datapath |
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