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BL6502A Datasheet(PDF) 6 Page - SHANGHAI BELLING CO., LTD. |
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BL6502A Datasheet(HTML) 6 Page - SHANGHAI BELLING CO., LTD. |
6 / 14 page ![]() BL6502A BL6502A BL6502A BL6502A http://www.belling.com.cn - 6 - 3/15/2007 Total 14 Pages Single Phase Energy Meter IC Single Phase Energy Meter IC Single Phase Energy Meter IC Single Phase Energy Meter IC with Integrated Oscillator with Integrated Oscillator with Integrated Oscillator with Integrated Oscillator Notes: 1) CF is not synchronous to F1 or F2 frequency outputs. 2) Sample tested during initial release and after any redesign or process change that may affect this parameter. THEORY OF OPERATION Principle of Energy Measure In energy measure, the power information varying with time is calculated by a direct multiplication of the voltage signal and the current signal. Assume that the current signal and the voltage signal are cosine functions; Umax, Imax are the peak values of the voltage signal and the current signal; ωis the angle frequency of the input signals; the phase difference between the current signal and the voltage signal is expressed asφ. Then the power is given as follows: ) cos( ) cos( ) ( max max ϕ + × = wt I wt U t p If φ=0: )] 2 cos( 1 [ 2 ) ( max max wt I U t p + = If φ≠0: [ ] [ ] ) 2 cos( 2 ) cos( 2 ) sin( ) 2 sin( ) cos( ) 2 cos( 2 ) cos( 2 ) sin( ) 2 sin( 2 ) cos( )] 2 cos( 1 [ 2 ) sin( ) sin( ) cos( ) cos( ] ) 2 cos( 1 [ 2 ) sin( ) sin( ) cos( ) cos( ) cos( ) cos( ) cos( ) ( max max max max max max max max max max max max max max max max max max max max max Φ + + Φ = Φ + Φ + Φ = Φ + Φ + = Φ + Φ + = Φ + Φ × = Φ + × = t I U I U t t I U I U t I U t I U t t I U t I U t I t I t U t I t U t p ω ω ω ω ω ω ω ω ω ω ω ω ω 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, that is: ) cos( 2 max max ϕ I U P = The average active power is related to the cosine value of the phase difference between the voltage signal and the current signal. This cosine value is called as Power Factor (PF) of the two channel signals. |
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