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STPM32 Datasheet(PDF) 84 Page - STMicroelectronics

No. de pieza STPM32
Descripción Electrónicos  ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA
PDF  121 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM32 Datasheet(HTML) 84 Page - STMicroelectronics

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Application design and calibration
STPM32, STPM33, STPM34
84/121
DS10272 Rev 8
Figure 53. Phase shift error
The θ angle can be measured through the error on active power (from LED) averaged over
a certain number of samples (for example 50) at power factor PF = 0,5.
For example, if the error = e, the phase shift between voltage and current is:
Equation 28
To compensate this error, PHC and PHV bits must be set as below, to introduce a correction
factor φ = -θ.
Table 40. Phase compensation
Parameter
Value
φ ≥ 0
PHVx = 0x0
PHVx = 0x1
PHCx[9] = 0x0
PHVx = 0x2
PHCx[9] = 0
PHVx = 0x3
PHCx[9] = 0
ar
1e
+
2
-------------

 60
–
cos
=
fline
SCLK
----------------
–
2
9 360

 0
PHCx 8:0

PHVx 2
9
 SCLK
360
 f
line
---------------------------
+
=
fline
SCLK
----------------
–
2
10 360

fline
SCLK
----------------
–
2
9 360

PHCx 8:0

PHVx 2
10
 SCLK
360
 f
line
---------------------------
+
=
fline
SCLK
----------------
–
2
9 3 360

fline
SCLK
----------------
–
2
10 360

PHCx 8:0

PHVx 2
9
 SCLK
360
 f
line
---------------------------
+
=



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