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STPM10 датащи(PDF) 38 Page - STMicroelectronics

номер детали STPM10
подробное описание детали  Programmable single-phase energy metering IC with tamper detection
PDF  51 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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STPM10 датащи(HTML) 38 Page - STMicroelectronics

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Theory of operation
STPM10
38/51
Doc ID 17728 Rev 3
At this point four signals are available. By combining (pairing) them by means of two
multiplying stages, two results are obtained:
Equation 11
[see Figure 26 - 9]
Equation 12
[see Figure 26 - 10]
After these two operations, another stage performs the subtraction between the results p2
and p1 and a division by 2, obtaining the active power:
Figure 26.
Active energy computation diagram
2
)
t
2
cos(
I
V
2
cos
I
V
dt
)
t
(
i
dt
dv
)
t
(
p1
ϕ
+
ω
⋅
⋅
−
ϕ
⋅
⋅
−
=
⋅
⋅
=
/
∫
2
)
t
2
cos(
I
V
2
cos
I
V
)
t
(
i
)
t
(
v
)
t
(
p2
ϕ
+
ω
⋅
⋅
−
ϕ
⋅
⋅
=
⋅
=
/



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