AD71056 Ver la hoja de datos (PDF) - Analog Devices

Número de pieza

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Fabricante

AD71056

Energy Metering IC with Integrated Oscillator and Reverse Polarity Indication

Analog Devices 

( ) ∞

i(t) = I0 +

2

×∑

h≠o

Ih

×

sin

hωt

+

βh

(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

∞

PH = ∑Vh × Ih cos ϕh

(5)

h≠1

ϕh = αh − βh

AD71056

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.

Rev. A | Page 11 of 20

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