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ADE7762 Datasheet(PDF) 20 Page - Analog Devices |
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ADE7762 Datasheet(HTML) 20 Page - Analog Devices |
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20 / 28 page  ADE7762 Preliminary Technical Data Rev. PrB | Page 20 of 28 HPF AND OFFSET EFFECTS Figure 27 shows the effect of offsets on the active power calculation. An offset on the current channel and voltage channel contributes a dc component after multiplication as shown in Figure 27. Since this dc component is extracted by the LPF and is used to generate the active power information for each phase, the offsets can contribute a constant error to the total active power calculation. The HPF in the current channels avoids this problem easily. By removing the offset from at least one channel, no error component can be generated at dc by the multiplication. Error terms at cos(ωt) are removed by the LPF and the digital-to-frequency conversion (see the Digital-to- Frequency Conversion) section. () {} () {} () ( ) () t I V t V I t I V I V I V I t I V t V OS OS OS OS OS OS ω × × + ω × + ω × + × + × = + ω × + ω 2 cos 2 cos cos 2 cos cos (9) ω VOS ×IOS IOS ×V VOS ×I DC COMPONENT (INCLUDING ERROR TERM) IS EXTRACTED BY THE LPF FOR REAL POWER CALCULATION 2 ω FREQUENCY – RAD/S 2 V× I 0 Figure 27. Effect of Channel Offset on the Active Power Calculation The HPF in the current channels has an associated phase response that is compensated for on-chip. Figure 28 and Figure 29 show the phase error between channels with the compensation network. The ADE7762 is phase compensated up to 1 kHz as shown. This ensures correct active harmonic power calculation even at low power factors. Figure 28. Phase Error between Channels (0 Hz to 1 kHz) Figure 29. Phase Error Between Channels (40 Hz to 70 Hz) |
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