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STPM32 数据表(PDF) 54 Page - STMicroelectronics |
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STPM32 数据表(HTML) 54 Page - STMicroelectronics |
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54 / 121 page  Theory of operation STPM32, STPM33, STPM34 54/121 DS10272 Rev 8 Figure 40. Zero-crossing signal 8.4.9 Phase meter Phase meter detects: The period of the voltage line The phase-angle delay between voltage and current Figure 41. Phase meter Period measurement Starting from ZRC signals, line period and voltage/current phase shift are calculated. Period information for the two phases is located in DSP_REG1 register. The measurement of the period is from ZRC signal of voltage channel. The period is calculated like an average of last eight measured periods. The initial values of period are set on 0x9C4 (2500). LSB of period is 8 s given by FCLK clock = 125 kHz. Limits to consider the correct period are between 0x600 (1536) and 0x800 (3840) corresponding to a frequency range between 32.55 and 81.38 Hz. If the voltage signal frequency is out of this range, PER_ERR status bit is set in DSP_SR1/2. PER_ERR = 0: period in the range ZRC Signal GIPG2803141129LM ZRC_V Period and Phase-angle detector FClk 125kHz ZRC_I Cx_PHA [11:0] PHx PERIOD[11:0] PER_ERR GIPG2803141133LM |
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