STPM32 datasheet(83/121 Pages) STMICROELECTRONICS

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DS10272 Rev 8

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STPM32, STPM33, STPM34

Application design and calibration

121

phase compensation can be set per each channel, and it is executed delaying the currents

and voltage samples using bits of the phase calibration configurators: PHCx[9:0] and

PHVx[1:0].

These registers act in the same way by delaying the desired waveform by a certain quantity

given from the equations below in degree:

A capacitive behavior is determined by the current leading the voltage waveform to a certain

angle. In this case, there is the compensation by delaying the current waveform by the same

angle through PHCx register. For a 50 Hz line the current channel waveform maximum

delayed is:

φC ≤ 4.6035° with step φC =0.0045°

An inductive behavior has the opposite effect, so that current lags the voltage waveform. In

this case, PHV register delays the voltage waveform by the minimum angle to invert the

behavior to capacitive and then acting on PHCx register for the fine tuning of the current

waveform.

PHV impacts on the calculation of power and energies related to both current channels. For

a 50 Hz line, the voltage channel waveform maximum delayed is:

φV≤ 6.912 ° with step φV = 2.304 °.

Table 39. Phase-delay

Parameter

Value

Current shift

Voltage shift

Global phase shift



fline

SCLK

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

PHCx 9:0

 PHVx 1:0

 2



–

 360



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