STPM32 datasheet(84/121 Pages) STMICROELECTRONICS

Part #	STPM32

Description	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

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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84 / 121 page

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



-------------



 60

–

cos

fline

SCLK

----------------

–

9 360



 0





PHCx 8:0



PHVx 2

 SCLK



360

 f

line



---------------------------



fline

SCLK

----------------

–

10 360





fline

SCLK

----------------

–

9 360







PHCx 8:0



PHVx 2

 SCLK



360

 f

line



---------------------------



fline

SCLK

----------------

–

9 3 360





fline

SCLK

----------------

–

10 360









PHCx 8:0



PHVx 2

 SCLK



360

 f

line



---------------------------



STPM32 Datasheet(PDF) 84 Page - STMicroelectronics

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