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STPM11 Datasheet(PDF) 34 Page - STMicroelectronics

No. de pieza STPM11
Descripción Electrónicos  Single phase energy metering IC with pulsed output and digital calibration
PDF  43 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM11 Datasheet(HTML) 34 Page - STMicroelectronics

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Energy calculation algorithm
STPM11/12/13/14
34/43
[Eq. 10]
[
[Eq. 11]
The signals process flow is the same as shown in the previous case, and even with the
formulas above, the result is the same.
The absence of any AC component allows a very fast calibration procedure. Averaging the
readings of several line periods is not needed. The active energy measurement is already
stable after one line cycle. Moreover the digital calibration allows saving time and space
compared to the hardware calibration made with resistor strings.
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ϕ
ω+
⋅
−
=
=
⋅
′
=
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∫
t
I
t
i
dt
t
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t
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