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AN3322 датащи(PDF) 31 Page - STMicroelectronics

номер детали AN3322
подробное описание детали  Watt-hour meter based on the STM32F101 microcontroller
PDF  38 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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AN3322 датащи(HTML) 31 Page - STMicroelectronics

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AN3322
Computational issues and compensation algorithms
The voltage and IL are shifted by two samples:
Equation 31
Tshift_I_L ~ 2 samples ~3 µs ~ 0.05 deg.
The voltage and IH are shifted by four samples:
Equation 32
Tshift_I_H ~ 4 samples ~ 6 µs ~ 0.1 deg.
Table 6 shows what level of the phase shift correction is necessary to be reached in order to
lower the error caused by the phase shift to an acceptable value. It can be seen that we
need to correct the phase shift to a value lower than 0.1 deg. This value can be easily
reached by the phase shift compensation filter introduced in Section 2.7.3, compensating
with the step of 0.013 deg. The value 0.013 deg. allows negligible error of the instant power
caused by the phase shift to be reached.
Data from Table 6 are depicted in Figure 19, Figure 20, and Figure 21.
Table 6. Error of instant power caused by phase shift
Sampling time trigger shifted
by [deg.]
Error of instant power [%]
for PF = 1
Error of instant power [%]
for PF = 0.5
0.01
0.000002
0.030232
0.02
0.000006
0.060466
0.05
0.000038
0.151200
0.1
0.000152
0.302500
0.2
0.000609
0.605200
0.5
0.003808
1.515300
1
0.015230
3.038100
2
0.060917
6.105700
5
0.380500
15.476300



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