BL6528

Single-phase Multifunction Metering IC

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V1.0

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2

c o s (

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wt

VI

t

p

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If

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sin(

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2

sin(

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cos(

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sin(

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sin(

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cos(

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cos(

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cos(

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wt

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wt

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I

wt

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t

p

p(t) is called as the instantaneous power signal. The ideal p(t) consists of the DC component and

AC component whose frequency is 2ω. The DC component is called as the average active power.

The current signal and voltage signal is converted to digital signals by high-precision ADCS,

then through the drop sampling filter (SINC4), high-pass filter (HPF) filter out the high frequency

noise and DC gain, get the required current and voltage sampling data.

Current sampling data multiplied by voltage sampling data gets instantaneous active power,

then through the low pass filter (LPF), output average active power.

Current sampling data and voltage sampling data processed by Hilbert circuit, gets

instantaneous reactive power, then through low-pass filter( LPF), output average reactive power.

Current sampling data and voltage sampling data processed by square circuit, low-pass

filter( LPF1), square root circuit, get the current RMS and voltage RMS.

Active power through a certain time integral, get active energy.

Reactive power through a certain time integral, get reactive energy.