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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STPM11 датащи(PDF) 34 Page - STMicroelectronics |
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STPM11 датащи(HTML) 34 Page - STMicroelectronics |
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34 / 45 page  Energy calculation algorithm STPM11/12/13/14 34/45 8 Energy calculation algorithm Inside the STPM1x the computing section of the measured active power uses a completely new patented signal process approach. This approach allows the device to reach high performances in terms of accuracy. The signals, coming from the sensors, for the instantaneous voltage is: v(t) = V•sin ωt; where V is the peak voltage and ωis related to the line frequency (see[1]) and the instantaneous current is: i(t) = I • sin ( ωt + ϕ); where I is the peak current, ωis related to the line frequency and ϕ is the phase difference between voltage and current (see[2]) Active power In the STPM1x, after the pre-conditioning and the A/D conversion, the digital voltage signal (which is dynamically more stable with respect to the current signal) is processed by a differentiate stage which transforms: v(t) →v’(t) = dv/dt = V ⋅ ω⋅ cos tω−[Eq. 1 - see (5) in Figure 6] The result, together with the pre-processed and digitalized current signal: Figure 22. Active energy computation diagram |
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