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AD71056AR bảng dữ liệu(PDF) 11 Page - Analog Devices |
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AD71056AR bảng dữ liệu(HTML) 11 Page - Analog Devices |
11 / 20 page AD71056 Rev. A | Page 11 of 20 ( ∑ ∞ ≠ + ω × × + = o h h β t h h I 0 I t i sin 2 ) ( ) (3) where: i(t) is the instantaneous current. I0 is the dc component. Ih is the rms value of Current Harmonic h. βh is the phase angle of the current harmonic. Using Equation 2 and Equation 3, the real power, P, can be expressed in terms of its fundamental real power (P1) and harmonic real power (PH) as P = P1 + PH where: P1 = V1 × I1 cos ϕ1 (4) ϕ1 = α1 − β1 and PH ∑ ∞ = ≠1 h h H V P × Ih cos ϕh (5) ϕh = αh − βh In Equation 5, a harmonic real power component is generated for every harmonic, provided that harmonic is present in both the voltage and current waveforms. The power factor calculation has previously been shown to be accurate in the case of a pure sinusoid. Therefore, the harmonic real power must also correctly account for the power factor because it is made up of a series of pure sinusoids. Note that the input bandwidth of the analog inputs is 7 kHz at the nominal internal oscillator frequency of 450 kHz. |
Số phần tương tự - AD71056AR |
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Mô tả tương tự - AD71056AR |
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