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STPM11 数据表(PDF) 34 Page - STMicroelectronics

部件名 STPM11
功能描述  Single phase energy metering IC with pulsed output and digital calibration
PDF  43 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STPM11 数据表(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.
)
sin(
)
(
)
(
)
(
ϕ
ω+
⋅
−
=
=
⋅
′
=
′′
∫
t
I
t
i
dt
t
i
t
i



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