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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STPM10 датащи(PDF) 40 Page - STMicroelectronics |
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STPM10 датащи(HTML) 40 Page - STMicroelectronics |
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40 / 51 page  Theory of operation STPM10 40/51 Doc ID 17728 Rev 3 The reactive power, then, presents a ripple at twice the line frequency. Since the average value of a sinusoid is 0, this ripple does not contribute to the reactive energy calculation over time. Moreover, in the STPM10 the reactive power is not used for meter calibration or to generate the stepper pulses, so this ripple does not affect the overall system performance. 7.23.3 Apparent power and RMS values The RMS values are calculated starting from the following formulas: Equation 18 Multiplying Equation 18 by ω, the I RMS value is obtained: Equation 19 The RMS voltage value is obtained by: Equation 20 For the apparent power, another value is produced: Equation 21 Multiplying Equation 18 and Equation 21, the apparent power is produced: Equation 22 ()) t 2 sin( sin 2 VI ) t ( Q 2 1 ) t ( Q 1 3 ϕ + ω − ϕ ⋅ = ω ⋅ ⋅ = 2 I dt ) t ( I T 1 T 0 2 ⋅ ω = ∫ 2 I I RMS = 2 V dt ) t ( v T 1 V T 0 2 RMS = = ∫ 2 V dt ) t ( v T 1 T 0 2 ω ⋅ = ′ ∫ |
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