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STPM32 数据表(PDF) 59 Page - STMicroelectronics |
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STPM32 数据表(HTML) 59 Page - STMicroelectronics |
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59 / 121 page  DS10272 Rev 8 59/121 STPM32, STPM33, STPM34 Theory of operation 121 To calculate the filtering time for the sag event, we consider the time in which the nominal instantaneous voltage is below the sag threshold, that is: Equation 15 To correctly distinguish between normal sinusoidal voltage and sag event, the filtering time should be added to this component, for example half line period (10 ms at 50 Hz). Since LSB of SAG_TIME_THRx register is 8 s (FCLK = 125 kHz), the value to set is: Equation 16 In the same way: VSWELL: target RMS value of swell voltage AV: voltage sensor gain DSWELL = 210, length of swell threshold register calV = 0.875, calibrator mid value Following the above calculation we obtain the hexadecimal value of voltage swell threshold: Register value Register LSB RMS value Table 17. Voltage swell Parameter Value Register value Register LSB RMS value Table 16. Voltage sag (continued) Parameter Value SAG VSAG Vref -------------- AV 2calV R2 R1 R2 + -------------------- DSAG HEX = LSBSAG R1 R2 + V ref AV 2R2 calV D SAG ------------------------------------------------------------------ V = time 2 arc VSAG VL -------------- sin 1000 2 f L ------------- ms = SWELLV VSWELL Vref --------------------- AV 2 R2 R1 R2 + -------------------- calV D SWELL HEX = LSBSWELL Vref R1 R2 + AV 2R2 calV D SWELL ------------------------------------------------------------------------- V = |
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