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ADE7933 数据表(PDF) 89 Page - Analog Devices |
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ADE7933 数据表(HTML) 89 Page - Analog Devices |
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89 / 125 page  Data Sheet ADE7978/ADE7933/ADE7932/ADE7923 Rev. D | Page 89 of 125 A meter built for a 3-wire delta configuration requires only two ADE7933/ADE7932 devices (see Figure 113): one for Phase A and one for Phase C. If it is acceptable for the ADE7978 to float at the phase voltage, a ADE7923 can be used along with a ADE7933/ ADE7932 for the two phases. The voltage dividers measure the Phase A to Phase B and the Phase C to Phase B voltages. The shunts measure the Phase A and Phase C currents. In this configuration, the DATA_N and DATA_B pins of the ADE7978 are connected to VDD. If the meter is built for a 4-wire delta configuration, three ADE7933/ADE7932 devices are required (see Figure 114). The voltage dividers measure the Phase A and Phase C to neutral voltages. The shunts measure the Phase A, Phase B, and Phase C currents. In this configuration, the DATA_N pin of the ADE7978 is connected to VDD. ISOLATION BARRIER PHASE C ADE7932/ ADE7933 IP IM V1P VM V2P GNDMCU GNDISO_C 3.3V ADE7978 GNDMCU 3.3V 3.3V I2C/HSDC OR SPI IRQ0, IRQ1 PHASE A ADE7932/ ADE7933 IP IM V1P VM V2P GNDMCU GNDISO_A 3.3V SYNC CLKOUT DATA_B RESET_EN DATA_A VT_A DATA_C VT_C DATA SYNC XTAL1 V2/TEMP RESET_EN DATA SYNC XTAL1 V2/TEMP RESET_EN 3.3V DATA_N Figure 113. 3-Phase, 3-Wire Delta Meter with One ADE7978 and Two ADE7933/ADE7932 Devices ISOLATION BARRIER PHASE B ADE7932/ ADE7933 IP IM V1P VM V2P GNDMCU GNDISO_B 3.3V PHASE C ADE7932/ ADE7933 IP IM V1P VM V2P GNDMCU GNDISO_C 3.3V ADE7978 GNDMCU 3.3V 3.3V I2C/HSDC OR SPI IRQ0, IRQ1 PHASE A ADE7932/ ADE7933 IP IM V1P VM V2P GNDMCU GNDISO_A 3.3V SYNC CLKOUT DATA_N RESET_EN DATA_A VT_A DATA_B VT_B DATA_C VT_C DATA SYNC XTAL1 V2/TEMP RESET_EN DATA SYNC XTAL1 V2/TEMP RESET_EN DATA SYNC XTAL1 V2/TEMP RESET_EN 3.3V LOAD Figure 114. 3-Phase, 4-Wire Delta Meter with One ADE7978 and Three ADE7933/ADE7932 Devices |
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