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ADE7757ARN 데이터시트(PDF) 9 Page - Analog Devices |
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ADE7757ARN 데이터시트(HTML) 9 Page - Analog Devices |
9 / 14 page –9– PRELIMINARY TECHNICAL DATA REV. PrC. ADE7757 Using Equations 1 and 2, the real power P can be ex- pressed in terms of its fundamental real power (P1) and harmonic real power (PH). H 1 P P P + = where: 1 1 1 1 1 1 1 cos I V P β − α = φ φ × = (3) and h h h 1 h h h h H cos I V P β − α = φ φ × = ∑ ∞ ≠ (4) As can be seen from Equation 4 above, a harmonic real power component is generated for every harmonic, pro- vided that harmonic is present in both the voltage and current waveforms. The power factor calculation has pre- viously been shown to be accurate in the case of a pure sinusoid, therefore the harmonic real power must also correctly account for power factor since it is made up of a series of pure sinusoids. Note that the input bandwidth of the analog inputs is 14 kHz with. ANALOG INPUTS Channel V1 (Current Channel ) The voltage output from the current sensor is connected to the ADE7757 here. Channel V1 is a fully differential voltage input. V1P is the positive input with respect to V1N. The maximum peak differential signal on Channel V1 should be less than ±30 mV (21 mV rms for a pure sinusoidal signal) for specified operation. DIFFERENTIAL INPUT ±30mV MAX PEAK +30mV AGND VCM V1 V1P VCM -30mV COMMON-MODE ±6.25mV MAX V1N V1 Figure 13. Maximum Signal Levels, Channel V1 The diagram in Figure 13 illustrates the maximum signal levels on V1P and V1N. The maximum differential voltage is ±30 mV. The differential voltage signal on the inputs must be referenced to a common mode, e.g. AGND. The maximum common mode signal is ±6.25 mV as shown in Figure 13. Channel V2 (Voltage Channel ) The output of the line voltage sensor is connected to the ADE7757 at this analog input. Channel V2 is a fully differen- tial voltage input with maximum peak differential signal of ±165 mV. Figure 14 illustrates the maximum signal levels that can be connected to the ADE7757 Channel V2. DIFFERENTIAL INPUT ±165mV MAX PEAK +165mV AGND VCM V2 V2P VCM -165mV COMMON-MODE ±25mV MAX V2N V2 Figure 14. Maximum Signal Levels, Channel V2 Channel V2 is usually driven from a common-mode volt- age, i.e., the differential voltage signal on the input is referenced to a common mode (usually AGND). The analog inputs of the ADE7757 can be driven with com- mon-mode voltages of up to 25 mV with respect to AGND. However best results are achieved using a com- mon mode equal to AGND. Typical Connection Diagrams Figure 15 shows a typical connection diagram for Channel V1. A shunt is the current sensor selected for this example because of its low cost compared to other current sensors such as the CT (current transformer). This IC is ideal for low current meters. V1P AGND ±30mV Rf Rf SHUNT V1N Cf Cf PHASE NEUTRAL Figure 15. Typical Connection for Channel V1 Figure 16 shows a typical connection for Channel V2. Typically, ADE7757 is biased around the neutral wire, and a resistor divider is used to provide a voltage signal that is proportional to the line voltage. Adjusting the ratio of Ra, Rb and VR is also a convenient way of carrying out a gain calibration on a meter. Ra* Rb* VR* ±165mV V2P Rf NEUTRAL PHASE V2N Cf Cf *Ra >> Rf + VR *Rb + VR = Rf Figure 16. Typical Connections for Channel V2 |
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